From b69e92131a44d84f16b010d49c077dade9ca78a1 Mon Sep 17 00:00:00 2001
From: Kohei Asai <me@axross.io>
Date: Tue, 1 Oct 2019 11:12:48 -0700
Subject: [PATCH] Denosize

---
 .gitignore                                    |    1 -
 README.md                                     |   26 +-
 jest.config.js                                |    4 -
 package-lock.json                             | 5051 -----------------
 package.json                                  |   19 -
 solutions/addBinary.test.ts                   |   14 -
 solutions/{addBinary.ts => add_binary.ts}     |    4 +-
 solutions/add_binary_test.ts                  |    8 +
 solutions/backspaceStringCompare.test.ts      |   16 -
 ...Compare.ts => backspace_string_compare.ts} |    4 +-
 solutions/backspace_string_compare_test.ts    |   10 +
 solutions/bestTimeToBuyAndSellStock.test.ts   |   16 -
 ....ts => best_time_to_buy_and_sell_stock.ts} |    4 +-
 .../best_time_to_buy_and_sell_stock_test.ts   |   10 +
 solutions/binarySearch.test.ts                |   14 -
 solutions/binaryTreeInorderTraversal.test.ts  |   21 -
 .../binaryTreeLevelOrderTraversal.test.ts     |   23 -
 .../binaryTreePostorderTraversal.test.ts      |   21 -
 solutions/binaryTreePreorderTraversal.test.ts |   21 -
 .../{binarySearch.ts => binary_search.ts}     |    0
 solutions/binary_search_test.ts               |    8 +
 ...al.ts => binary_tree_inorder_traversal.ts} |    2 +-
 .../binary_tree_inorder_traversal_test.ts     |   27 +
 ...s => binary_tree_level_order_traversal.ts} |    2 +-
 .../binary_tree_level_order_traversal_test.ts |   25 +
 ....ts => binary_tree_postorder_traversal.ts} |    2 +-
 .../binary_tree_postorder_traversal_test.ts   |   27 +
 ...l.ts => binary_tree_preorder_traversal.ts} |    2 +-
 .../binary_tree_preorder_traversal_test.ts    |   27 +
 solutions/bullsAndCows.test.ts                |   19 -
 .../{bullsAndCows.ts => bulls_and_cows.ts}    |    4 +-
 solutions/bulls_and_cows_test.ts              |   13 +
 solutions/climbingStairs.test.ts              |   11 -
 .../{climbingStairs.ts => climbing_stairs.ts} |    4 +-
 solutions/climbing_stairs_test.ts             |   11 +
 solutions/countCompleteTreeNodes.test.ts      |   17 -
 solutions/countUnivalueSubtrees.test.ts       |   16 -
 .../{countAndSay.ts => count_and_say.ts}      |    4 +-
 ...ntAndSay.test.ts => count_and_say_test.ts} |   32 +-
 ...eNodes.ts => count_complete_tree_nodes.ts} |    8 +-
 solutions/count_complete_tree_nodes_test.ts   |   11 +
 ...Subtrees.ts => count_univalue_subtrees.ts} |    2 +-
 solutions/count_univalue_subtrees_test.ts     |   14 +
 solutions/diameterOfBinaryTree.test.ts        |   51 -
 ...naryTree.ts => diameter_of_binary_tree.ts} |    2 +-
 solutions/diameter_of_binary_tree_test.ts     |   46 +
 solutions/distance_between_bus_stops.ts       |   23 +
 solutions/distance_between_bus_stops_test.ts  |    9 +
 ...LastPositionOfElementInSortedArray.test.ts |   15 -
 solutions/findKClosestElements.test.ts        |   16 -
 .../findMinimumInRotatedSortedArray.test.ts   |   18 -
 solutions/findPeakElement.test.ts             |   29 -
 solutions/findTheTownJudge.test.ts            |   18 -
 ...ng.ts => find_all_anagrams_in_a_string.ts} |    0
 ... => find_all_anagrams_in_a_string_test.ts} |   32 +-
 ...st_position_of_element_in_sorted_array.ts} |    0
 ...osition_of_element_in_sorted_array_test.ts |    9 +
 ...Elements.ts => find_k_closest_elements.ts} |    0
 solutions/find_k_closest_elements_test.ts     |   17 +
 ...> find_minimum_in_rotated_sorted_array.ts} |    0
 ...nd_minimum_in_rotated_sorted_array_test.ts |   12 +
 ...indPeakElement.ts => find_peak_element.ts} |    0
 solutions/find_peak_element_test.ts           |   10 +
 ...TheTownJudge.ts => find_the_town_judge.ts} |    0
 solutions/find_the_town_judge_test.ts         |   12 +
 solutions/firstBadVersion.test.ts             |   10 -
 .../firstUniqueCharacterInAString.test.ts     |   18 -
 ...irstBadVersion.ts => first_bad_version.ts} |    0
 solutions/first_bad_version_test.ts           |   10 +
 ... => first_unique_character_in_a_string.ts} |    4 +-
 ...first_unique_character_in_a_string_test.ts |   12 +
 solutions/fizzBuzz.test.ts                    |   40 -
 solutions/{fizzBuzz.ts => fizz_buzz.ts}       |    4 +-
 solutions/fizz_buzz_test.ts                   |   31 +
 solutions/flipping_an_image.ts                |   11 +
 solutions/flipping_an_image_test.ts           |   20 +
 solutions/floodFill.test.ts                   |   47 -
 solutions/{floodFill.ts => flood_fill.ts}     |    4 +-
 solutions/flood_fill_test.ts                  |   36 +
 solutions/happyNumber.test.ts                 |   11 -
 solutions/{happyNumber.ts => happy_number.ts} |    4 +-
 solutions/happy_number_test.ts                |    8 +
 solutions/houseRobber.test.ts                 |   15 -
 solutions/{houseRobber.ts => house_robber.ts} |    4 +-
 solutions/house_robber_test.ts                |    9 +
 solutions/implementStrstr.test.ts             |   21 -
 ...implementStrstr.ts => implement_strstr.ts} |    4 +-
 solutions/implement_strstr_test.ts            |   15 +
 solutions/intersectionOfTwoArrays.test.ts     |   14 -
 solutions/intersectionOfTwoArrays2.test.ts    |  147 -
 .../intersectionOfTwoLinkedLists.test.ts      |   30 -
 ...rrays.ts => intersection_of_two_arrays.ts} |    7 +-
 ...ays2.ts => intersection_of_two_arrays2.ts} |    0
 solutions/intersection_of_two_arrays2_test.ts |  141 +
 solutions/intersection_of_two_arrays_test.ts  |    8 +
 ...ts => intersection_of_two_linked_lists.ts} |    2 +-
 .../intersection_of_two_linked_lists_test.ts  |   30 +
 solutions/licenseKeyFormatting.test.ts        |   14 -
 ...ormatting.ts => license_key_formatting.ts} |    4 +-
 solutions/license_key_formatting_test.ts      |    8 +
 solutions/linkedListCycle.test.ts             |   27 -
 ...inkedListCycle.ts => linked_list_cycle.ts} |    2 +-
 solutions/linked_list_cycle_test.ts           |   25 +
 solutions/loggerRateLimiter.test.ts           |   16 -
 ...rRateLimiter.ts => logger_rate_limiter.ts} |    4 +-
 solutions/logger_rate_limiter_test.ts         |   14 +
 solutions/longestCommonPrefix.test.ts         |   18 -
 ...mmonPrefix.ts => longest_common_prefix.ts} |    4 +-
 solutions/longest_common_prefix_test.ts       |   12 +
 solutions/longest_mountain_in_array.ts        |   34 +
 solutions/longest_mountain_in_array_test.ts   |   11 +
 ...estPalindrome.ts => longest_palindrome.ts} |    0
 ...ome.test.ts => longest_palindrome_test.ts} |   35 +-
 solutions/lruCache.test.ts                    |   56 -
 solutions/{lruCache.ts => lru_cache.ts}       |    4 +-
 solutions/lru_cache_test.ts                   |   26 +
 solutions/majorityElement.test.ts             |   11 -
 ...majorityElement.ts => majority_element.ts} |    0
 solutions/majority_element_test.ts            |    8 +
 solutions/maxAreaOfIsland.test.ts             |   27 -
 ...xAreaOfIsland.ts => max_area_of_island.ts} |    0
 solutions/max_area_of_island_test.ts          |   27 +
 solutions/maximumDepthOfBinaryTree.test.ts    |   12 -
 solutions/maximumLengthOfPairChain.test.ts    |   15 -
 solutions/maximumSubarray.test.ts             |   14 -
 ...ree.ts => maximum_depth_of_binary_tree.ts} |    2 +-
 .../maximum_depth_of_binary_tree_test.ts      |    9 +
 ...ain.ts => maximum_length_of_pair_chain.ts} |    0
 .../maximum_length_of_pair_chain_test.ts      |    9 +
 ...maximumSubarray.ts => maximum_subarray.ts} |    4 +-
 solutions/maximum_subarray_test.ts            |    8 +
 solutions/mergeSortedArray.test.ts            |   23 -
 solutions/mergeTwoLists.test.ts               |   20 -
 ...geSortedArray.ts => merge_sorted_array.ts} |    4 +-
 solutions/merge_sorted_array_test.ts          |   13 +
 .../{mergeTwoLists.ts => merge_two_lists.ts}  |    6 +-
 solutions/merge_two_lists_test.ts             |   21 +
 solutions/minCostClimbingStairs.test.ts       |   14 -
 solutions/minStack.test.ts                    |   14 -
 ...gStairs.ts => min_cost_climbing_stairs.ts} |    4 +-
 solutions/min_cost_climbing_stairs_test.ts    |    8 +
 solutions/{minStack.ts => min_stack.ts}       |    4 +-
 solutions/min_stack_test.ts                   |   14 +
 solutions/minimumDepthOfBinaryTree.test.ts    |   18 -
 ...ree.ts => minimum_depth_of_binary_tree.ts} |    2 +-
 .../minimum_depth_of_binary_tree_test.ts      |   12 +
 solutions/mostCommonWord.test.ts              |   19 -
 ...{mostCommonWord.ts => most_common_word.ts} |    7 +-
 solutions/most_common_word_test.ts            |   19 +
 solutions/moveZeroes.test.ts                  |   15 -
 solutions/{moveZeroes.ts => move_zeroes.ts}   |    4 +-
 solutions/move_zeroes_test.ts                 |   11 +
 solutions/paintHouse.test.ts                  |   18 -
 solutions/{paintHouse.ts => paint_house.ts}   |    4 +-
 solutions/paint_house_test.ts                 |   34 +
 solutions/palidromeNumber.test.ts             |   19 -
 ...palidromeNumber.ts => palidrome_number.ts} |    4 +-
 solutions/palidrome_number_test.ts            |   13 +
 solutions/palindromeLinkedList.test.ts        |   17 -
 ...inkedList.ts => palindrome_linked_list.ts} |    2 +-
 solutions/palindrome_linked_list_test.ts      |   15 +
 solutions/partitionEqualSubsetSum.test.ts     |   15 -
 ...etSum.ts => partition_equal_subset_sum.ts} |    4 +-
 solutions/partition_equal_subset_sum_test.ts  |    9 +
 solutions/pathSum.test.ts                     |   16 -
 solutions/{pathSum.ts => path_sum.ts}         |    2 +-
 solutions/path_sum_test.ts                    |   48 +
 solutions/perfectNumber.test.ts               |   17 -
 .../{perfectNumber.ts => perfect_number.ts}   |    0
 solutions/perfect_number_test.ts              |   11 +
 solutions/plusOne.test.ts                     |   21 -
 solutions/{plusOne.ts => plus_one.ts}         |    4 +-
 solutions/plus_one_test.ts                    |   15 +
 solutions/rangeSumQueryImmutable.test.ts      |  134 -
 ...utable.ts => range_sum_query_immutable.ts} |    4 +-
 solutions/range_sum_query_immutable_test.ts   |  774 +++
 .../removeDuplicatesFromSortedArray.test.ts   |   18 -
 ...=> remove_duplicates_from_sorted_array.ts} |    4 +-
 ...emove_duplicates_from_sorted_array_test.ts |    9 +
 solutions/reorderLogFiles.test.ts             |   74 -
 ...eorderLogFiles.ts => reorder_log_files.ts} |    4 +-
 solutions/reorder_log_files_test.ts           |   77 +
 solutions/reverseInteger.test.ts              |   17 -
 solutions/reverseLinkedList.test.ts           |   19 -
 solutions/reverseString.test.ts               |   18 -
 .../{reverseInteger.ts => reverse_integer.ts} |    4 +-
 solutions/reverse_integer_test.ts             |   11 +
 ...seLinkedList.ts => reverse_linked_list.ts} |    6 +-
 solutions/reverse_linked_list_test.ts         |   23 +
 .../{reverseString.ts => reverse_string.ts}   |    4 +-
 solutions/reverse_string_test.ts              |   17 +
 solutions/romanToInteger.test.ts              |   20 -
 ...{romanToInteger.ts => roman_to_integer.ts} |    4 +-
 solutions/roman_to_integer_test.ts            |   14 +
 solutions/searchA2dMatrix2.test.ts            |   40 -
 solutions/searchInRotatedSortedArray.test.ts  |   17 -
 solutions/searchInsertPosition.test.ts        |   16 -
 ...rchA2dMatrix2.ts => search_a2d_matrix2.ts} |    0
 solutions/search_a2d_matrix2_test.ts          |   30 +
 ...y.ts => search_in_rotated_sorted_array.ts} |    0
 .../search_in_rotated_sorted_array_test.ts    |   11 +
 ...tPosition.ts => search_insert_position.ts} |    0
 solutions/search_insert_position_test.ts      |   10 +
 solutions/sqrtx.test.ts                       |   19 -
 solutions/sqrtx_test.ts                       |   13 +
 solutions/strobogrammaticNumber.test.ts       |   19 -
 ...ticNumber.ts => strobogrammatic_number.ts} |    4 +-
 solutions/strobogrammatic_number_test.ts      |   13 +
 solutions/subsets.test.ts                     |   15 -
 solutions/subsets.ts                          |    4 +-
 solutions/subsets_test.ts                     |   10 +
 solutions/subtreeOfAnotherTree.test.ts        |   47 -
 ...therTree.ts => subtree_of_another_tree.ts} |    2 +-
 solutions/subtree_of_another_tree_test.ts     |   48 +
 solutions/symmetricTree.test.ts               |   17 -
 .../{symmetricTree.ts => symmetric_tree.ts}   |    8 +-
 solutions/symmetric_tree_test.ts              |   15 +
 solutions/twoSum.test.ts                      |   14 -
 solutions/{twoSum.ts => two_sum.ts}           |    7 +-
 solutions/two_sum_test.ts                     |    8 +
 solutions/uniqueEmailAddresses.test.ts        |   28 -
 solutions/uniquePaths.test.ts                 |   11 -
 ...Addresses.ts => unique_email_addresses.ts} |    4 +-
 solutions/unique_email_addresses_test.ts      |   20 +
 solutions/{uniquePaths.ts => unique_paths.ts} |    0
 solutions/unique_paths_test.ts                |    8 +
 solutions/validAnagram.test.ts                |   15 -
 solutions/validPalindrome.test.ts             |   16 -
 solutions/validParentheses.test.ts            |   19 -
 .../{validAnagram.ts => valid_anagram.ts}     |    0
 solutions/valid_anagram_test.ts               |    9 +
 ...validPalindrome.ts => valid_palindrome.ts} |    4 +-
 solutions/valid_palindrome_test.ts            |   10 +
 ...lidParentheses.ts => valid_parentheses.ts} |    4 +-
 solutions/valid_parentheses_test.ts           |   13 +
 solutions/validateBinarySearchTree.test.ts    |   17 -
 ...Tree.ts => validate_binary_search_tree.ts} |    2 +-
 solutions/validate_binary_search_tree_test.ts |   13 +
 solutions/verifyingAnAlienDictionary.test.ts  |   15 -
 ...ry.ts => verifying_an_alien_dictionary.ts} |    4 +-
 .../verifying_an_alien_dictionary_test.ts     |   16 +
 testUtilities/BinaryTree.test.ts              |   73 -
 testUtilities/LinkedList.test.ts              |   96 -
 .../binary_tree.ts                            |    2 +-
 test_utilities/binary_tree_test.ts            |   53 +
 .../linked_list.ts                            |    2 +-
 test_utilities/linked_list_test.ts            |   67 +
 tsconfig.json                                 |   21 -
 types/{BinaryTree.ts => binary_tree.ts}       |    0
 types/{LinkedList.ts => linked_list.ts}       |    0
 250 files changed, 2507 insertions(+), 7288 deletions(-)
 delete mode 100644 jest.config.js
 delete mode 100644 package-lock.json
 delete mode 100644 package.json
 delete mode 100644 solutions/addBinary.test.ts
 rename solutions/{addBinary.ts => add_binary.ts} (89%)
 create mode 100644 solutions/add_binary_test.ts
 delete mode 100644 solutions/backspaceStringCompare.test.ts
 rename solutions/{backspaceStringCompare.ts => backspace_string_compare.ts} (75%)
 create mode 100644 solutions/backspace_string_compare_test.ts
 delete mode 100644 solutions/bestTimeToBuyAndSellStock.test.ts
 rename solutions/{bestTimeToBuyAndSellStock.ts => best_time_to_buy_and_sell_stock.ts} (84%)
 create mode 100644 solutions/best_time_to_buy_and_sell_stock_test.ts
 delete mode 100644 solutions/binarySearch.test.ts
 delete mode 100644 solutions/binaryTreeInorderTraversal.test.ts
 delete mode 100644 solutions/binaryTreeLevelOrderTraversal.test.ts
 delete mode 100644 solutions/binaryTreePostorderTraversal.test.ts
 delete mode 100644 solutions/binaryTreePreorderTraversal.test.ts
 rename solutions/{binarySearch.ts => binary_search.ts} (100%)
 create mode 100644 solutions/binary_search_test.ts
 rename solutions/{binaryTreeInorderTraversal.ts => binary_tree_inorder_traversal.ts} (88%)
 create mode 100644 solutions/binary_tree_inorder_traversal_test.ts
 rename solutions/{binaryTreeLevelOrderTraversal.ts => binary_tree_level_order_traversal.ts} (91%)
 create mode 100644 solutions/binary_tree_level_order_traversal_test.ts
 rename solutions/{binaryTreePostorderTraversal.ts => binary_tree_postorder_traversal.ts} (88%)
 create mode 100644 solutions/binary_tree_postorder_traversal_test.ts
 rename solutions/{binaryTreePreorderTraversal.ts => binary_tree_preorder_traversal.ts} (88%)
 create mode 100644 solutions/binary_tree_preorder_traversal_test.ts
 delete mode 100644 solutions/bullsAndCows.test.ts
 rename solutions/{bullsAndCows.ts => bulls_and_cows.ts} (90%)
 create mode 100644 solutions/bulls_and_cows_test.ts
 delete mode 100644 solutions/climbingStairs.test.ts
 rename solutions/{climbingStairs.ts => climbing_stairs.ts} (79%)
 create mode 100644 solutions/climbing_stairs_test.ts
 delete mode 100644 solutions/countCompleteTreeNodes.test.ts
 delete mode 100644 solutions/countUnivalueSubtrees.test.ts
 rename solutions/{countAndSay.ts => count_and_say.ts} (90%)
 rename solutions/{countAndSay.test.ts => count_and_say_test.ts} (90%)
 rename solutions/{countCompleteTreeNodes.ts => count_complete_tree_nodes.ts} (84%)
 create mode 100644 solutions/count_complete_tree_nodes_test.ts
 rename solutions/{countUnivalueSubtrees.ts => count_univalue_subtrees.ts} (92%)
 create mode 100644 solutions/count_univalue_subtrees_test.ts
 delete mode 100644 solutions/diameterOfBinaryTree.test.ts
 rename solutions/{diameterOfBinaryTree.ts => diameter_of_binary_tree.ts} (92%)
 create mode 100644 solutions/diameter_of_binary_tree_test.ts
 create mode 100644 solutions/distance_between_bus_stops.ts
 create mode 100644 solutions/distance_between_bus_stops_test.ts
 delete mode 100644 solutions/findFirstAndLastPositionOfElementInSortedArray.test.ts
 delete mode 100644 solutions/findKClosestElements.test.ts
 delete mode 100644 solutions/findMinimumInRotatedSortedArray.test.ts
 delete mode 100644 solutions/findPeakElement.test.ts
 delete mode 100644 solutions/findTheTownJudge.test.ts
 rename solutions/{findAllAnagramsInAString.ts => find_all_anagrams_in_a_string.ts} (100%)
 rename solutions/{findAllAnagramsInAString.test.ts => find_all_anagrams_in_a_string_test.ts} (97%)
 rename solutions/{findFirstAndLastPositionOfElementInSortedArray.ts => find_first_and_last_position_of_element_in_sorted_array.ts} (100%)
 create mode 100644 solutions/find_first_and_last_position_of_element_in_sorted_array_test.ts
 rename solutions/{findKClosestElements.ts => find_k_closest_elements.ts} (100%)
 create mode 100644 solutions/find_k_closest_elements_test.ts
 rename solutions/{findMinimumInRotatedSortedArray.ts => find_minimum_in_rotated_sorted_array.ts} (100%)
 create mode 100644 solutions/find_minimum_in_rotated_sorted_array_test.ts
 rename solutions/{findPeakElement.ts => find_peak_element.ts} (100%)
 create mode 100644 solutions/find_peak_element_test.ts
 rename solutions/{findTheTownJudge.ts => find_the_town_judge.ts} (100%)
 create mode 100644 solutions/find_the_town_judge_test.ts
 delete mode 100644 solutions/firstBadVersion.test.ts
 delete mode 100644 solutions/firstUniqueCharacterInAString.test.ts
 rename solutions/{firstBadVersion.ts => first_bad_version.ts} (100%)
 create mode 100644 solutions/first_bad_version_test.ts
 rename solutions/{firstUniqueCharacterInAString.ts => first_unique_character_in_a_string.ts} (80%)
 create mode 100644 solutions/first_unique_character_in_a_string_test.ts
 delete mode 100644 solutions/fizzBuzz.test.ts
 rename solutions/{fizzBuzz.ts => fizz_buzz.ts} (84%)
 create mode 100644 solutions/fizz_buzz_test.ts
 create mode 100644 solutions/flipping_an_image.ts
 create mode 100644 solutions/flipping_an_image_test.ts
 delete mode 100644 solutions/floodFill.test.ts
 rename solutions/{floodFill.ts => flood_fill.ts} (95%)
 create mode 100644 solutions/flood_fill_test.ts
 delete mode 100644 solutions/happyNumber.test.ts
 rename solutions/{happyNumber.ts => happy_number.ts} (83%)
 create mode 100644 solutions/happy_number_test.ts
 delete mode 100644 solutions/houseRobber.test.ts
 rename solutions/{houseRobber.ts => house_robber.ts} (88%)
 create mode 100644 solutions/house_robber_test.ts
 delete mode 100644 solutions/implementStrstr.test.ts
 rename solutions/{implementStrstr.ts => implement_strstr.ts} (72%)
 create mode 100644 solutions/implement_strstr_test.ts
 delete mode 100644 solutions/intersectionOfTwoArrays.test.ts
 delete mode 100644 solutions/intersectionOfTwoArrays2.test.ts
 delete mode 100644 solutions/intersectionOfTwoLinkedLists.test.ts
 rename solutions/{intersectionOfTwoArrays.ts => intersection_of_two_arrays.ts} (77%)
 rename solutions/{intersectionOfTwoArrays2.ts => intersection_of_two_arrays2.ts} (100%)
 create mode 100644 solutions/intersection_of_two_arrays2_test.ts
 create mode 100644 solutions/intersection_of_two_arrays_test.ts
 rename solutions/{intersectionOfTwoLinkedLists.ts => intersection_of_two_linked_lists.ts} (86%)
 create mode 100644 solutions/intersection_of_two_linked_lists_test.ts
 delete mode 100644 solutions/licenseKeyFormatting.test.ts
 rename solutions/{licenseKeyFormatting.ts => license_key_formatting.ts} (79%)
 create mode 100644 solutions/license_key_formatting_test.ts
 delete mode 100644 solutions/linkedListCycle.test.ts
 rename solutions/{linkedListCycle.ts => linked_list_cycle.ts} (86%)
 create mode 100644 solutions/linked_list_cycle_test.ts
 delete mode 100644 solutions/loggerRateLimiter.test.ts
 rename solutions/{loggerRateLimiter.ts => logger_rate_limiter.ts} (92%)
 create mode 100644 solutions/logger_rate_limiter_test.ts
 delete mode 100644 solutions/longestCommonPrefix.test.ts
 rename solutions/{longestCommonPrefix.ts => longest_common_prefix.ts} (86%)
 create mode 100644 solutions/longest_common_prefix_test.ts
 create mode 100644 solutions/longest_mountain_in_array.ts
 create mode 100644 solutions/longest_mountain_in_array_test.ts
 rename solutions/{longestPalindrome.ts => longest_palindrome.ts} (100%)
 rename solutions/{longestPalindrome.test.ts => longest_palindrome_test.ts} (62%)
 delete mode 100644 solutions/lruCache.test.ts
 rename solutions/{lruCache.ts => lru_cache.ts} (95%)
 create mode 100644 solutions/lru_cache_test.ts
 delete mode 100644 solutions/majorityElement.test.ts
 rename solutions/{majorityElement.ts => majority_element.ts} (100%)
 create mode 100644 solutions/majority_element_test.ts
 delete mode 100644 solutions/maxAreaOfIsland.test.ts
 rename solutions/{maxAreaOfIsland.ts => max_area_of_island.ts} (100%)
 create mode 100644 solutions/max_area_of_island_test.ts
 delete mode 100644 solutions/maximumDepthOfBinaryTree.test.ts
 delete mode 100644 solutions/maximumLengthOfPairChain.test.ts
 delete mode 100644 solutions/maximumSubarray.test.ts
 rename solutions/{maximumDepthOfBinaryTree.ts => maximum_depth_of_binary_tree.ts} (82%)
 create mode 100644 solutions/maximum_depth_of_binary_tree_test.ts
 rename solutions/{maximumLengthOfPairChain.ts => maximum_length_of_pair_chain.ts} (100%)
 create mode 100644 solutions/maximum_length_of_pair_chain_test.ts
 rename solutions/{maximumSubarray.ts => maximum_subarray.ts} (79%)
 create mode 100644 solutions/maximum_subarray_test.ts
 delete mode 100644 solutions/mergeSortedArray.test.ts
 delete mode 100644 solutions/mergeTwoLists.test.ts
 rename solutions/{mergeSortedArray.ts => merge_sorted_array.ts} (94%)
 create mode 100644 solutions/merge_sorted_array_test.ts
 rename solutions/{mergeTwoLists.ts => merge_two_lists.ts} (79%)
 create mode 100644 solutions/merge_two_lists_test.ts
 delete mode 100644 solutions/minCostClimbingStairs.test.ts
 delete mode 100644 solutions/minStack.test.ts
 rename solutions/{minCostClimbingStairs.ts => min_cost_climbing_stairs.ts} (80%)
 create mode 100644 solutions/min_cost_climbing_stairs_test.ts
 rename solutions/{minStack.ts => min_stack.ts} (94%)
 create mode 100644 solutions/min_stack_test.ts
 delete mode 100644 solutions/minimumDepthOfBinaryTree.test.ts
 rename solutions/{minimumDepthOfBinaryTree.ts => minimum_depth_of_binary_tree.ts} (89%)
 create mode 100644 solutions/minimum_depth_of_binary_tree_test.ts
 delete mode 100644 solutions/mostCommonWord.test.ts
 rename solutions/{mostCommonWord.ts => most_common_word.ts} (87%)
 create mode 100644 solutions/most_common_word_test.ts
 delete mode 100644 solutions/moveZeroes.test.ts
 rename solutions/{moveZeroes.ts => move_zeroes.ts} (86%)
 create mode 100644 solutions/move_zeroes_test.ts
 delete mode 100644 solutions/paintHouse.test.ts
 rename solutions/{paintHouse.ts => paint_house.ts} (89%)
 create mode 100644 solutions/paint_house_test.ts
 delete mode 100644 solutions/palidromeNumber.test.ts
 rename solutions/{palidromeNumber.ts => palidrome_number.ts} (87%)
 create mode 100644 solutions/palidrome_number_test.ts
 delete mode 100644 solutions/palindromeLinkedList.test.ts
 rename solutions/{palindromeLinkedList.ts => palindrome_linked_list.ts} (90%)
 create mode 100644 solutions/palindrome_linked_list_test.ts
 delete mode 100644 solutions/partitionEqualSubsetSum.test.ts
 rename solutions/{partitionEqualSubsetSum.ts => partition_equal_subset_sum.ts} (85%)
 create mode 100644 solutions/partition_equal_subset_sum_test.ts
 delete mode 100644 solutions/pathSum.test.ts
 rename solutions/{pathSum.ts => path_sum.ts} (91%)
 create mode 100644 solutions/path_sum_test.ts
 delete mode 100644 solutions/perfectNumber.test.ts
 rename solutions/{perfectNumber.ts => perfect_number.ts} (100%)
 create mode 100644 solutions/perfect_number_test.ts
 delete mode 100644 solutions/plusOne.test.ts
 rename solutions/{plusOne.ts => plus_one.ts} (83%)
 create mode 100644 solutions/plus_one_test.ts
 delete mode 100644 solutions/rangeSumQueryImmutable.test.ts
 rename solutions/{rangeSumQueryImmutable.ts => range_sum_query_immutable.ts} (91%)
 create mode 100644 solutions/range_sum_query_immutable_test.ts
 delete mode 100644 solutions/removeDuplicatesFromSortedArray.test.ts
 rename solutions/{removeDuplicatesFromSortedArray.ts => remove_duplicates_from_sorted_array.ts} (85%)
 create mode 100644 solutions/remove_duplicates_from_sorted_array_test.ts
 delete mode 100644 solutions/reorderLogFiles.test.ts
 rename solutions/{reorderLogFiles.ts => reorder_log_files.ts} (93%)
 create mode 100644 solutions/reorder_log_files_test.ts
 delete mode 100644 solutions/reverseInteger.test.ts
 delete mode 100644 solutions/reverseLinkedList.test.ts
 delete mode 100644 solutions/reverseString.test.ts
 rename solutions/{reverseInteger.ts => reverse_integer.ts} (89%)
 create mode 100644 solutions/reverse_integer_test.ts
 rename solutions/{reverseLinkedList.ts => reverse_linked_list.ts} (79%)
 create mode 100644 solutions/reverse_linked_list_test.ts
 rename solutions/{reverseString.ts => reverse_string.ts} (77%)
 create mode 100644 solutions/reverse_string_test.ts
 delete mode 100644 solutions/romanToInteger.test.ts
 rename solutions/{romanToInteger.ts => roman_to_integer.ts} (91%)
 create mode 100644 solutions/roman_to_integer_test.ts
 delete mode 100644 solutions/searchA2dMatrix2.test.ts
 delete mode 100644 solutions/searchInRotatedSortedArray.test.ts
 delete mode 100644 solutions/searchInsertPosition.test.ts
 rename solutions/{searchA2dMatrix2.ts => search_a2d_matrix2.ts} (100%)
 create mode 100644 solutions/search_a2d_matrix2_test.ts
 rename solutions/{searchInRotatedSortedArray.ts => search_in_rotated_sorted_array.ts} (100%)
 create mode 100644 solutions/search_in_rotated_sorted_array_test.ts
 rename solutions/{searchInsertPosition.ts => search_insert_position.ts} (100%)
 create mode 100644 solutions/search_insert_position_test.ts
 delete mode 100644 solutions/sqrtx.test.ts
 create mode 100644 solutions/sqrtx_test.ts
 delete mode 100644 solutions/strobogrammaticNumber.test.ts
 rename solutions/{strobogrammaticNumber.ts => strobogrammatic_number.ts} (83%)
 create mode 100644 solutions/strobogrammatic_number_test.ts
 delete mode 100644 solutions/subsets.test.ts
 create mode 100644 solutions/subsets_test.ts
 delete mode 100644 solutions/subtreeOfAnotherTree.test.ts
 rename solutions/{subtreeOfAnotherTree.ts => subtree_of_another_tree.ts} (91%)
 create mode 100644 solutions/subtree_of_another_tree_test.ts
 delete mode 100644 solutions/symmetricTree.test.ts
 rename solutions/{symmetricTree.ts => symmetric_tree.ts} (82%)
 create mode 100644 solutions/symmetric_tree_test.ts
 delete mode 100644 solutions/twoSum.test.ts
 rename solutions/{twoSum.ts => two_sum.ts} (85%)
 create mode 100644 solutions/two_sum_test.ts
 delete mode 100644 solutions/uniqueEmailAddresses.test.ts
 delete mode 100644 solutions/uniquePaths.test.ts
 rename solutions/{uniqueEmailAddresses.ts => unique_email_addresses.ts} (77%)
 create mode 100644 solutions/unique_email_addresses_test.ts
 rename solutions/{uniquePaths.ts => unique_paths.ts} (100%)
 create mode 100644 solutions/unique_paths_test.ts
 delete mode 100644 solutions/validAnagram.test.ts
 delete mode 100644 solutions/validPalindrome.test.ts
 delete mode 100644 solutions/validParentheses.test.ts
 rename solutions/{validAnagram.ts => valid_anagram.ts} (100%)
 create mode 100644 solutions/valid_anagram_test.ts
 rename solutions/{validPalindrome.ts => valid_palindrome.ts} (90%)
 create mode 100644 solutions/valid_palindrome_test.ts
 rename solutions/{validParentheses.ts => valid_parentheses.ts} (91%)
 create mode 100644 solutions/valid_parentheses_test.ts
 delete mode 100644 solutions/validateBinarySearchTree.test.ts
 rename solutions/{validateBinarySearchTree.ts => validate_binary_search_tree.ts} (88%)
 create mode 100644 solutions/validate_binary_search_tree_test.ts
 delete mode 100644 solutions/verifyingAnAlienDictionary.test.ts
 rename solutions/{verifyingAnAlienDictionary.ts => verifying_an_alien_dictionary.ts} (91%)
 create mode 100644 solutions/verifying_an_alien_dictionary_test.ts
 delete mode 100644 testUtilities/BinaryTree.test.ts
 delete mode 100644 testUtilities/LinkedList.test.ts
 rename testUtilities/BinaryTree.ts => test_utilities/binary_tree.ts (94%)
 create mode 100644 test_utilities/binary_tree_test.ts
 rename testUtilities/LinkedList.ts => test_utilities/linked_list.ts (93%)
 create mode 100644 test_utilities/linked_list_test.ts
 delete mode 100644 tsconfig.json
 rename types/{BinaryTree.ts => binary_tree.ts} (100%)
 rename types/{LinkedList.ts => linked_list.ts} (100%)

diff --git a/.gitignore b/.gitignore
index 0a101d0..75ec3f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1 @@
-node_modules/*
 .vscode/*
\ No newline at end of file
diff --git a/README.md b/README.md
index 71d5059..f61e6cc 100644
--- a/README.md
+++ b/README.md
@@ -1,30 +1,6 @@
 # LeetCode Solutions in TypeScript
 
 - 🏃‍♀️ Enough small time and space complexity (not "minimum" because of no micro optimization)
-- 💯 100% TypeScript
+- 💯 Runs on [Deno](https://deno.land) (written in TypeScript)
 - ✅ Fully tested
 - 🗣 With helpful comments
-
-# Debugging on VSCode
-
-Install [📦ts-node](https://github.com/TypeStrong/ts-node) with `--no-save` and create `launch.json` like the following:
-
-```
-{
-  "version": "0.2.0",
-  "configurations": [
-    {
-      "name": "Run the current TypeScript file",
-      "type": "node",
-      "request": "launch",
-      "protocol": "inspector",
-      "cwd": "${workspaceRoot}",
-      "args": ["${relativeFile}"],
-      "runtimeArgs": ["--nolazy", "-r", "ts-node/register"],
-      "sourceMaps": true
-    }
-  ]
-}
-```
-
-Then run debug "Run the current TypeScript file".
diff --git a/jest.config.js b/jest.config.js
deleted file mode 100644
index 3f878c4..0000000
--- a/jest.config.js
+++ /dev/null
@@ -1,4 +0,0 @@
-module.exports = {
-  preset: "ts-jest",
-  testEnvironment: "node"
-};
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index 32c5885..0000000
--- a/package-lock.json
+++ /dev/null
@@ -1,5051 +0,0 @@
-{
-  "name": "leetnode",
-  "version": "0.0.0",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
-    "@babel/code-frame": {
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-      "dev": true,
-      "requires": {
-        "@babel/highlight": "^7.0.0"
-      }
-    },
-    "@babel/core": {
-      "version": "7.5.5",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.5.5.tgz",
-      "integrity": "sha512-i4qoSr2KTtce0DmkuuQBV4AuQgGPUcPXMr9L5MyYAtk06z068lQ10a4O009fe5OB/DfNV+h+qqT7ddNV8UnRjg==",
-      "dev": true,
-      "requires": {
-        "@babel/code-frame": "^7.5.5",
-        "@babel/generator": "^7.5.5",
-        "@babel/helpers": "^7.5.5",
-        "@babel/parser": "^7.5.5",
-        "@babel/template": "^7.4.4",
-        "@babel/traverse": "^7.5.5",
-        "@babel/types": "^7.5.5",
-        "convert-source-map": "^1.1.0",
-        "debug": "^4.1.0",
-        "json5": "^2.1.0",
-        "lodash": "^4.17.13",
-        "resolve": "^1.3.2",
-        "semver": "^5.4.1",
-        "source-map": "^0.5.0"
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-          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
-          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
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-          "version": "0.5.7",
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-      "dev": true,
-      "requires": {
-        "isexe": "^2.0.0"
-      }
-    },
-    "which-module": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
-      "dev": true
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-      "version": "0.0.3",
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-      "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
-      "dev": true
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-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-          "dev": true
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-        "is-fullwidth-code-point": {
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-          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
-          "dev": true,
-          "requires": {
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-          }
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-          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
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-          "requires": {
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-            "strip-ansi": "^3.0.0"
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-    "wrappy": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
-      "dev": true
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-    "write-file-atomic": {
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-      "integrity": "sha512-TGHFeZEZMnv+gBFRfjAcxL5bPHrsGKtnb4qsFAws7/vlh+QfwAaySIw4AXP9ZskTTh5GWu3FLuJhsWVdiJPGvg==",
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-        "imurmurhash": "^0.1.4",
-        "signal-exit": "^3.0.2"
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-      "dev": true
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-      "dev": true
-    },
-    "yargs": {
-      "version": "12.0.5",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
-      "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
-      "dev": true,
-      "requires": {
-        "cliui": "^4.0.0",
-        "decamelize": "^1.2.0",
-        "find-up": "^3.0.0",
-        "get-caller-file": "^1.0.1",
-        "os-locale": "^3.0.0",
-        "require-directory": "^2.1.1",
-        "require-main-filename": "^1.0.1",
-        "set-blocking": "^2.0.0",
-        "string-width": "^2.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^3.2.1 || ^4.0.0",
-        "yargs-parser": "^11.1.1"
-      },
-      "dependencies": {
-        "require-main-filename": {
-          "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
-          "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
-          "dev": true
-        }
-      }
-    },
-    "yargs-parser": {
-      "version": "11.1.1",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
-      "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
-      "dev": true,
-      "requires": {
-        "camelcase": "^5.0.0",
-        "decamelize": "^1.2.0"
-      }
-    }
-  }
-}
diff --git a/package.json b/package.json
deleted file mode 100644
index f1f1433..0000000
--- a/package.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "name": "leetnode",
-  "version": "0.0.0",
-  "description": "",
-  "main": "index.js",
-  "dependencies": {},
-  "devDependencies": {
-    "@types/jest": "^24.0.17",
-    "jest": "^24.8.0",
-    "prettier": "^1.18.2",
-    "ts-jest": "^24.0.2",
-    "typescript": "^3.6.3"
-  },
-  "scripts": {
-    "test": "jest --notify --verbose"
-  },
-  "author": "Kohei Asai <me@axross.io> (https://axross.io/)",
-  "license": "MIT"
-}
diff --git a/solutions/addBinary.test.ts b/solutions/addBinary.test.ts
deleted file mode 100644
index 99f0abb..0000000
--- a/solutions/addBinary.test.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import addBinary from "./addBinary";
-
-describe("67. Add Binary", () => {
-  const TEST_CASES = new Map([
-    [["11", "1"], "100"],
-    [["1010", "1011"], "10101"]
-  ]);
-
-  for (const [[a, b], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${a} and ${b}`, () => {
-      expect(addBinary(a, b)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/addBinary.ts b/solutions/add_binary.ts
similarity index 89%
rename from solutions/addBinary.ts
rename to solutions/add_binary.ts
index 31486d3..194946d 100644
--- a/solutions/addBinary.ts
+++ b/solutions/add_binary.ts
@@ -1,6 +1,6 @@
 // 67. Add Binary
 // https://leetcode.com/problems/add-binary/
-function addBinary(a: string, b: string): string {
+export default function addBinary(a: string, b: string): string {
   let result = "";
   let isCarrying = false;
 
@@ -22,5 +22,3 @@ function addBinary(a: string, b: string): string {
 
   return isCarrying ? "1" + result : result;
 }
-
-export default addBinary;
diff --git a/solutions/add_binary_test.ts b/solutions/add_binary_test.ts
new file mode 100644
index 0000000..1b8dfd8
--- /dev/null
+++ b/solutions/add_binary_test.ts
@@ -0,0 +1,8 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import addBinary from "./add_binary.ts";
+
+test("67. Add Binary", () => {
+  assert(addBinary("11", "1") === "100");
+  assert(addBinary("1010", "1011") === "10101");
+});
diff --git a/solutions/backspaceStringCompare.test.ts b/solutions/backspaceStringCompare.test.ts
deleted file mode 100644
index a8bf9c3..0000000
--- a/solutions/backspaceStringCompare.test.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import backspaceCompare from "./backspaceStringCompare";
-
-describe("844. Backspace String Compare", () => {
-  const TEST_CASES = new Map([
-    [["ab#c", "ad#c"], true],
-    [["ab##", "c#d#"], true],
-    [["a##c", "#a#c"], true],
-    [["a#c", "b"], false]
-  ]);
-
-  for (const [[s, t], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${s} and ${t}`, () => {
-      expect(backspaceCompare(s, t)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/backspaceStringCompare.ts b/solutions/backspace_string_compare.ts
similarity index 75%
rename from solutions/backspaceStringCompare.ts
rename to solutions/backspace_string_compare.ts
index 47f2cfe..7d9c46d 100644
--- a/solutions/backspaceStringCompare.ts
+++ b/solutions/backspace_string_compare.ts
@@ -1,6 +1,6 @@
 // 844. Backspace String Compare
 // https://leetcode.com/problems/backspace-string-compare/
-function backspaceCompare(S: string, T: string): boolean {
+export default function backspaceCompare(S: string, T: string): boolean {
   let s = S;
   let t = T;
 
@@ -14,5 +14,3 @@ function backspaceCompare(S: string, T: string): boolean {
 
   return s === t;
 }
-
-export default backspaceCompare;
diff --git a/solutions/backspace_string_compare_test.ts b/solutions/backspace_string_compare_test.ts
new file mode 100644
index 0000000..705fa8e
--- /dev/null
+++ b/solutions/backspace_string_compare_test.ts
@@ -0,0 +1,10 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import backspaceCompare from "./backspace_string_compare.ts";
+
+test("844. Backspace String Compare", () => {
+  assert(backspaceCompare("ab#c", "ad#c") === true);
+  assert(backspaceCompare("ab##", "c#d#") === true);
+  assert(backspaceCompare("a##c", "#a#c") === true);
+  assert(backspaceCompare("a#c", "b") === false);
+});
diff --git a/solutions/bestTimeToBuyAndSellStock.test.ts b/solutions/bestTimeToBuyAndSellStock.test.ts
deleted file mode 100644
index d5947dd..0000000
--- a/solutions/bestTimeToBuyAndSellStock.test.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import maxProfit from "./bestTimeToBuyAndSellStock";
-
-describe("121. Best Time to Buy and Sell Stock", () => {
-  const TEST_CASES = new Map([
-    [[7, 1, 5, 3, 6, 4], 5],
-    [[7, 6, 4, 3, 1], 0],
-    [[7, 6, 5, 2, 3, 4, 1], 2],
-    [[7, 3, 8, 1, 2, 5, 4], 5]
-  ]);
-
-  for (const [prices, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${prices}]`, () => {
-      expect(maxProfit(prices)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/bestTimeToBuyAndSellStock.ts b/solutions/best_time_to_buy_and_sell_stock.ts
similarity index 84%
rename from solutions/bestTimeToBuyAndSellStock.ts
rename to solutions/best_time_to_buy_and_sell_stock.ts
index 7c715fe..4323a85 100644
--- a/solutions/bestTimeToBuyAndSellStock.ts
+++ b/solutions/best_time_to_buy_and_sell_stock.ts
@@ -1,6 +1,6 @@
 // 121. Best Time to Buy and Sell Stock
 // https://leetcode.com/problems/best-time-to-buy-and-sell-stock/
-function maxProfit(prices: number[]): number {
+export default function maxProfit(prices: number[]): number {
   let maxProfit = 0;
   let minPrice = Number.MAX_SAFE_INTEGER;
 
@@ -14,5 +14,3 @@ function maxProfit(prices: number[]): number {
 
   return maxProfit;
 }
-
-export default maxProfit;
diff --git a/solutions/best_time_to_buy_and_sell_stock_test.ts b/solutions/best_time_to_buy_and_sell_stock_test.ts
new file mode 100644
index 0000000..1705444
--- /dev/null
+++ b/solutions/best_time_to_buy_and_sell_stock_test.ts
@@ -0,0 +1,10 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import maxProfit from "./best_time_to_buy_and_sell_stock.ts";
+
+test("121. Best Time to Buy and Sell Stock", () => {
+  assert(maxProfit([7, 1, 5, 3, 6, 4]) === 5);
+  assert(maxProfit([7, 6, 4, 3, 1]) === 0);
+  assert(maxProfit([7, 6, 5, 2, 3, 4, 1]) === 2);
+  assert(maxProfit([7, 3, 8, 1, 2, 5, 4]) === 5);
+});
diff --git a/solutions/binarySearch.test.ts b/solutions/binarySearch.test.ts
deleted file mode 100644
index 1f7a2b6..0000000
--- a/solutions/binarySearch.test.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import search from "./binarySearch";
-
-describe("704. Binary Search", () => {
-  const TEST_CASES = new Map<[number[], number], number>([
-    [[[-1, 0, 3, 5, 9, 12], 9], 4],
-    [[[-1, 0, 3, 5, 9, 12], 13], -1]
-  ]);
-
-  for (const [[nums, target], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${nums}] and ${target}`, () => {
-      expect(search(nums, target)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/binaryTreeInorderTraversal.test.ts b/solutions/binaryTreeInorderTraversal.test.ts
deleted file mode 100644
index 06fc897..0000000
--- a/solutions/binaryTreeInorderTraversal.test.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import inorderTraversal from "./binaryTreeInorderTraversal";
-
-describe("94. Binary Tree Inorder Traversal", () => {
-  const TEST_CASES = new Map([
-    [[1, null, 2, 3], [1, 3, 2]],
-    [[4, 4, 5, 1, 2], [1, 4, 2, 4, 5]],
-    [
-      [1, null, 1, null, 1, null, 1, null, 1, null, 1, 2],
-      [1, 1, 1, 1, 1, 2, 1]
-    ],
-    [[1], [1]],
-    [[], []]
-  ]);
-
-  for (const [tree, expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${tree}]`, () => {
-      expect(inorderTraversal(createBinaryTreeNode(tree))).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/binaryTreeLevelOrderTraversal.test.ts b/solutions/binaryTreeLevelOrderTraversal.test.ts
deleted file mode 100644
index 5bc229c..0000000
--- a/solutions/binaryTreeLevelOrderTraversal.test.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import levelOrder from "./binaryTreeLevelOrderTraversal";
-
-describe("102. Binary Tree Level Order Traversal", () => {
-  const TEST_CASES = new Map([
-    [[1, null, 2, 3], [[1], [2], [3]]],
-    [[4, 4, 5, 1, 2], [[4], [4, 5], [1, 2]]],
-    [
-      [1, null, 1, null, 1, null, 1, null, 1, null, 1, 2],
-      [[1], [1], [1], [1], [1], [1], [2]]
-    ],
-    [[1], [[1]]],
-    [[], []]
-  ]);
-
-  for (const [tree, expected] of TEST_CASES) {
-    it(`returns [${expected.map(
-      level => `[${level}]`
-    )}] when called with [${tree}]`, () => {
-      expect(levelOrder(createBinaryTreeNode(tree))).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/binaryTreePostorderTraversal.test.ts b/solutions/binaryTreePostorderTraversal.test.ts
deleted file mode 100644
index 14f466d..0000000
--- a/solutions/binaryTreePostorderTraversal.test.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import postorderTraversal from "./binaryTreePostorderTraversal";
-
-describe("145. Binary Tree Postorder Traversal", () => {
-  const TEST_CASES = new Map([
-    [[1, null, 2, 3], [3, 2, 1]],
-    [[4, 4, 5, 1, 2], [1, 2, 4, 5, 4]],
-    [
-      [1, null, 1, null, 1, null, 1, null, 1, null, 1, 2],
-      [2, 1, 1, 1, 1, 1, 1]
-    ],
-    [[1], [1]],
-    [[], []]
-  ]);
-
-  for (const [tree, expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${tree}]`, () => {
-      expect(postorderTraversal(createBinaryTreeNode(tree))).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/binaryTreePreorderTraversal.test.ts b/solutions/binaryTreePreorderTraversal.test.ts
deleted file mode 100644
index b886a64..0000000
--- a/solutions/binaryTreePreorderTraversal.test.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import preorderTraversal from "./binaryTreePreorderTraversal";
-
-describe("144. Binary Tree Preorder Traversal", () => {
-  const TEST_CASES = new Map([
-    [[1, null, 2, 3], [1, 2, 3]],
-    [[4, 4, 5, 1, 2], [4, 4, 1, 2, 5]],
-    [
-      [1, null, 1, null, 1, null, 1, null, 1, null, 1, 2],
-      [1, 1, 1, 1, 1, 1, 2]
-    ],
-    [[1], [1]],
-    [[], []]
-  ]);
-
-  for (const [tree, expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${tree}]`, () => {
-      expect(preorderTraversal(createBinaryTreeNode(tree))).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/binarySearch.ts b/solutions/binary_search.ts
similarity index 100%
rename from solutions/binarySearch.ts
rename to solutions/binary_search.ts
diff --git a/solutions/binary_search_test.ts b/solutions/binary_search_test.ts
new file mode 100644
index 0000000..315a888
--- /dev/null
+++ b/solutions/binary_search_test.ts
@@ -0,0 +1,8 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import search from "./binary_search.ts";
+
+test("704. Binary Search", () => {
+  assert(search([-1, 0, 3, 5, 9, 12], 9) === 4);
+  assert(search([-1, 0, 3, 5, 9, 12], 13) === -1);
+});
diff --git a/solutions/binaryTreeInorderTraversal.ts b/solutions/binary_tree_inorder_traversal.ts
similarity index 88%
rename from solutions/binaryTreeInorderTraversal.ts
rename to solutions/binary_tree_inorder_traversal.ts
index 9d39c23..afcb327 100644
--- a/solutions/binaryTreeInorderTraversal.ts
+++ b/solutions/binary_tree_inorder_traversal.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 94. Binary Tree Inorder Traversal
 // https://leetcode.com/problems/binary-tree-inorder-traversal/
diff --git a/solutions/binary_tree_inorder_traversal_test.ts b/solutions/binary_tree_inorder_traversal_test.ts
new file mode 100644
index 0000000..3765f59
--- /dev/null
+++ b/solutions/binary_tree_inorder_traversal_test.ts
@@ -0,0 +1,27 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import inorderTraversal from "./binary_tree_inorder_traversal.ts";
+
+test("94. Binary Tree Inorder Traversal", () => {
+  assertEquals(inorderTraversal(createBinaryTreeNode([1, null, 2, 3])), [
+    1,
+    3,
+    2
+  ]);
+  assertEquals(inorderTraversal(createBinaryTreeNode([4, 4, 5, 1, 2])), [
+    1,
+    4,
+    2,
+    4,
+    5
+  ]);
+  assertEquals(
+    inorderTraversal(
+      createBinaryTreeNode([1, null, 1, null, 1, null, 1, null, 1, null, 1, 2])
+    ),
+    [1, 1, 1, 1, 1, 2, 1]
+  );
+  assertEquals(inorderTraversal(createBinaryTreeNode([1])), [1]);
+  assertEquals(inorderTraversal(createBinaryTreeNode([])), []);
+});
diff --git a/solutions/binaryTreeLevelOrderTraversal.ts b/solutions/binary_tree_level_order_traversal.ts
similarity index 91%
rename from solutions/binaryTreeLevelOrderTraversal.ts
rename to solutions/binary_tree_level_order_traversal.ts
index d096604..d9c5675 100644
--- a/solutions/binaryTreeLevelOrderTraversal.ts
+++ b/solutions/binary_tree_level_order_traversal.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 102. Binary Tree Level Order Traversal
 // https://leetcode.com/problems/binary-tree-level-order-traversal/
diff --git a/solutions/binary_tree_level_order_traversal_test.ts b/solutions/binary_tree_level_order_traversal_test.ts
new file mode 100644
index 0000000..17b51a8
--- /dev/null
+++ b/solutions/binary_tree_level_order_traversal_test.ts
@@ -0,0 +1,25 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import levelorder from "./binary_tree_level_order_traversal.ts";
+
+test("102. Binary Tree Level Order Traversal", () => {
+  assertEquals(levelorder(createBinaryTreeNode([1, null, 2, 3])), [
+    [1],
+    [2],
+    [3]
+  ]);
+  assertEquals(levelorder(createBinaryTreeNode([4, 4, 5, 1, 2])), [
+    [4],
+    [4, 5],
+    [1, 2]
+  ]);
+  assertEquals(
+    levelorder(
+      createBinaryTreeNode([1, null, 1, null, 1, null, 1, null, 1, null, 1, 2])
+    ),
+    [[1], [1], [1], [1], [1], [1], [2]]
+  );
+  assertEquals(levelorder(createBinaryTreeNode([1])), [[1]]);
+  assertEquals(levelorder(createBinaryTreeNode([])), []);
+});
diff --git a/solutions/binaryTreePostorderTraversal.ts b/solutions/binary_tree_postorder_traversal.ts
similarity index 88%
rename from solutions/binaryTreePostorderTraversal.ts
rename to solutions/binary_tree_postorder_traversal.ts
index 8cf3475..73aa265 100644
--- a/solutions/binaryTreePostorderTraversal.ts
+++ b/solutions/binary_tree_postorder_traversal.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 145. Binary Tree Postorder Traversal
 // https://leetcode.com/problems/binary-tree-postorder-traversal/
diff --git a/solutions/binary_tree_postorder_traversal_test.ts b/solutions/binary_tree_postorder_traversal_test.ts
new file mode 100644
index 0000000..69aa0b2
--- /dev/null
+++ b/solutions/binary_tree_postorder_traversal_test.ts
@@ -0,0 +1,27 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import postorderTraversal from "./binary_tree_postorder_traversal.ts";
+
+test("145. Binary Tree Postorder Traversal", () => {
+  assertEquals(postorderTraversal(createBinaryTreeNode([1, null, 2, 3])), [
+    3,
+    2,
+    1
+  ]);
+  assertEquals(postorderTraversal(createBinaryTreeNode([4, 4, 5, 1, 2])), [
+    1,
+    2,
+    4,
+    5,
+    4
+  ]);
+  assertEquals(
+    postorderTraversal(
+      createBinaryTreeNode([1, null, 1, null, 1, null, 1, null, 1, null, 1, 2])
+    ),
+    [2, 1, 1, 1, 1, 1, 1]
+  );
+  assertEquals(postorderTraversal(createBinaryTreeNode([1])), [1]);
+  assertEquals(postorderTraversal(createBinaryTreeNode([])), []);
+});
diff --git a/solutions/binaryTreePreorderTraversal.ts b/solutions/binary_tree_preorder_traversal.ts
similarity index 88%
rename from solutions/binaryTreePreorderTraversal.ts
rename to solutions/binary_tree_preorder_traversal.ts
index 1756d4a..4e976d7 100644
--- a/solutions/binaryTreePreorderTraversal.ts
+++ b/solutions/binary_tree_preorder_traversal.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 144. Binary Tree Preorder Traversal
 // https://leetcode.com/problems/binary-tree-preorder-traversal/
diff --git a/solutions/binary_tree_preorder_traversal_test.ts b/solutions/binary_tree_preorder_traversal_test.ts
new file mode 100644
index 0000000..f83b1c1
--- /dev/null
+++ b/solutions/binary_tree_preorder_traversal_test.ts
@@ -0,0 +1,27 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import preorderTraversal from "./binary_tree_preorder_traversal.ts";
+
+test("144. Binary Tree Preorder Traversal", () => {
+  assertEquals(preorderTraversal(createBinaryTreeNode([1, null, 2, 3])), [
+    1,
+    2,
+    3
+  ]);
+  assertEquals(preorderTraversal(createBinaryTreeNode([4, 4, 5, 1, 2])), [
+    4,
+    4,
+    1,
+    2,
+    5
+  ]);
+  assertEquals(
+    preorderTraversal(
+      createBinaryTreeNode([1, null, 1, null, 1, null, 1, null, 1, null, 1, 2])
+    ),
+    [1, 1, 1, 1, 1, 1, 2]
+  );
+  assertEquals(preorderTraversal(createBinaryTreeNode([1])), [1]);
+  assertEquals(preorderTraversal(createBinaryTreeNode([])), []);
+});
diff --git a/solutions/bullsAndCows.test.ts b/solutions/bullsAndCows.test.ts
deleted file mode 100644
index f1f38a5..0000000
--- a/solutions/bullsAndCows.test.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import getHint from "./bullsAndCows";
-
-describe("299. Bulls and Cows", () => {
-  const TEST_CASES = new Map([
-    [["1807", "7810"], "1A3B"],
-    [["1123", "0111"], "1A1B"],
-    [["1234", "5678"], "0A0B"],
-    [["1234", "1234"], "4A0B"],
-    [["1234", "4123"], "0A4B"],
-    [["1122", "0001"], "0A1B"],
-    [["11", "10"], "1A0B"]
-  ]);
-
-  for (const [[secret, guess], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${secret} and ${guess}`, () => {
-      expect(getHint(secret, guess)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/bullsAndCows.ts b/solutions/bulls_and_cows.ts
similarity index 90%
rename from solutions/bullsAndCows.ts
rename to solutions/bulls_and_cows.ts
index 2747fe8..bce2eab 100644
--- a/solutions/bullsAndCows.ts
+++ b/solutions/bulls_and_cows.ts
@@ -1,6 +1,6 @@
 // 299. Bulls and Cows
 // https://leetcode.com/problems/bulls-and-cows/
-function getHint(secret: string, guess: string): string {
+export default function getHint(secret: string, guess: string): string {
   let bullsCount = 0;
   let cowsCount = 0;
   // arrays in javascript is hashmap. actually it runs even without parseInt() below
@@ -32,5 +32,3 @@ function getHint(secret: string, guess: string): string {
 
   return `${bullsCount}A${cowsCount}B`;
 }
-
-export default getHint;
diff --git a/solutions/bulls_and_cows_test.ts b/solutions/bulls_and_cows_test.ts
new file mode 100644
index 0000000..98884ef
--- /dev/null
+++ b/solutions/bulls_and_cows_test.ts
@@ -0,0 +1,13 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import getHint from "./bulls_and_cows.ts";
+
+test("299. Bulls and Cows", () => {
+  assert(getHint("1807", "7810") === "1A3B");
+  assert(getHint("1123", "0111") === "1A1B");
+  assert(getHint("1234", "5678") === "0A0B");
+  assert(getHint("1234", "1234") === "4A0B");
+  assert(getHint("1234", "4123") === "0A4B");
+  assert(getHint("1122", "0001") === "0A1B");
+  assert(getHint("11", "10") === "1A0B");
+});
diff --git a/solutions/climbingStairs.test.ts b/solutions/climbingStairs.test.ts
deleted file mode 100644
index 067c815..0000000
--- a/solutions/climbingStairs.test.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import climbStairs from "./climbingStairs";
-
-describe("70. Climbing Stairs", () => {
-  const TEST_CASES = new Map([[1, 1], [2, 2], [3, 3], [4, 5], [32, 3524578]]);
-
-  for (const [n, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${n}`, () => {
-      expect(climbStairs(n)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/climbingStairs.ts b/solutions/climbing_stairs.ts
similarity index 79%
rename from solutions/climbingStairs.ts
rename to solutions/climbing_stairs.ts
index 0e80996..48ac312 100644
--- a/solutions/climbingStairs.ts
+++ b/solutions/climbing_stairs.ts
@@ -1,6 +1,6 @@
 // 70. Climbing Stairs
 // https://leetcode.com/problems/climbing-stairs/
-function climbStairs(n: number): number {
+export default function climbStairs(n: number): number {
   if (memo.has(n)) {
     return memo.get(n)!;
   }
@@ -13,5 +13,3 @@ function climbStairs(n: number): number {
 }
 
 const memo = new Map<number, number>([[1, 1], [2, 2]]);
-
-export default climbStairs;
diff --git a/solutions/climbing_stairs_test.ts b/solutions/climbing_stairs_test.ts
new file mode 100644
index 0000000..8fda49c
--- /dev/null
+++ b/solutions/climbing_stairs_test.ts
@@ -0,0 +1,11 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import climbStairs from "./climbing_stairs.ts";
+
+test("70. Climbing Stairs", () => {
+  assert(climbStairs(1) === 1);
+  assert(climbStairs(2) === 2);
+  assert(climbStairs(3) === 3);
+  assert(climbStairs(4) === 5);
+  assert(climbStairs(32) === 3524578);
+});
diff --git a/solutions/countCompleteTreeNodes.test.ts b/solutions/countCompleteTreeNodes.test.ts
deleted file mode 100644
index 7b25686..0000000
--- a/solutions/countCompleteTreeNodes.test.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import countNodes from "./countCompleteTreeNodes";
-
-describe("222. Count Complete Tree Nodes", () => {
-  const TEST_CASES = new Map([
-    [[1, 2, 3, 4, 5, 6], 6],
-    [[], 0],
-    [[1, 2, 3, 4, 5, 6, 7, 8], 8],
-    [[1, 2, 3, 4, 5, 6, 7], 7]
-  ]);
-
-  for (const [values, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}]`, () => {
-      expect(countNodes(createBinaryTreeNode(values))).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/countUnivalueSubtrees.test.ts b/solutions/countUnivalueSubtrees.test.ts
deleted file mode 100644
index c0a5371..0000000
--- a/solutions/countUnivalueSubtrees.test.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import countUnivalSubtrees from "./countUnivalueSubtrees";
-
-describe("250. Count Univalue Subtrees", () => {
-  const TEST_CASES = new Map([
-    [[5, 1, 5, 5, 5, null, 5], 4],
-    [[1, 4, 3, 4, 4, 5, 6], 5],
-    [[], 0]
-  ]);
-
-  for (const [values, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}]`, () => {
-      expect(countUnivalSubtrees(createBinaryTreeNode(values))).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/countAndSay.ts b/solutions/count_and_say.ts
similarity index 90%
rename from solutions/countAndSay.ts
rename to solutions/count_and_say.ts
index f048a6b..af0ee17 100644
--- a/solutions/countAndSay.ts
+++ b/solutions/count_and_say.ts
@@ -1,6 +1,6 @@
 // 38. Count and Say
 // https://leetcode.com/problems/count-and-say/
-function countAndSay(n: number): string {
+export default function countAndSay(n: number): string {
   function recursion(string: string): string {
     let lastChar = string[0];
     let lastCharStreak = 0;
@@ -32,5 +32,3 @@ function countAndSay(n: number): string {
 
   return result;
 }
-
-export default countAndSay;
diff --git a/solutions/countAndSay.test.ts b/solutions/count_and_say_test.ts
similarity index 90%
rename from solutions/countAndSay.test.ts
rename to solutions/count_and_say_test.ts
index 37daf29..56b5049 100644
--- a/solutions/countAndSay.test.ts
+++ b/solutions/count_and_say_test.ts
@@ -1,22 +1,16 @@
-import countAndSay from "./countAndSay";
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import countAndSay from "./count_and_say.ts";
 
-describe("38. Count and Say", () => {
-  const TEST_CASES = new Map([
-    [1, "1"],
-    [2, "11"],
-    [3, "21"],
-    [4, "1211"],
-    [5, "111221"],
-    [10, "13211311123113112211"],
-    [
-      30,
+test("38. Count and Say", () => {
+  assert(countAndSay(1) === "1");
+  assert(countAndSay(2) === "11");
+  assert(countAndSay(3) === "21");
+  assert(countAndSay(4) === "1211");
+  assert(countAndSay(5) === "111221");
+  assert(countAndSay(10) === "13211311123113112211");
+  assert(
+    countAndSay(30) ===
       "3113112221131112311332111213122112311311123112111331121113122112132113121113222112311311221112131221123113112221121113311211131122211211131221131211132221121321132132212321121113121112133221123113112221131112212211131221121321131211132221123113112221131112311332211211133112111311222112111312211311123113322112111312211312111322212321121113121112133221121321132132211331121321132213211231132132211211131221232112111312212221121123222112311311222113111231133211121321321122111312211312111322211213211321322123211211131211121332211231131122211311123113321112131221123113111231121123222112111331121113112221121113122113111231133221121113122113121113221112131221123113111231121123222112111312211312111322212321121113121112131112132112311321322112111312212321121113122122211211232221121321132132211331121321231231121113112221121321132132211322132113213221123113112221133112132123222112111312211312112213211231132132211211131221131211322113321132211221121332211231131122211311123113321112131221123113111231121113311211131221121321131211132221123113112211121312211231131122211211133112111311222112111312211312111322211213211321223112111311222112132113213221133122211311221122111312211312111322212321121113121112131112132112311321322112111312212321121113122122211211232221121321132132211331121321231231121113112221121321132132211322132113213221123113112221133112132123222112111312211312112213211231132132211211131221131211322113321132211221121332211213211321322113311213212312311211131122211213211331121321123123211231131122211211131221131112311332211213211321223112111311222112132113213221123123211231132132211231131122211311123113322112111312211312111322111213122112311311123112112322211213211321322113312211223113112221121113122113111231133221121321132132211331222113321112131122211332113221122112133221123113112221131112311332111213122112311311123112111331121113122112132113121113222112311311221112131221123113112221121113311211131122211211131221131211132221121321132132212321121113121112133221123113112221131112311332111213122112311311123112112322211322311311222113111231133211121312211231131112311211232221121113122113121113222123211211131221132211131221121321131211132221123113112211121312211231131122113221122112133221121321132132211331121321231231121113121113122122311311222113111231133221121113122113121113221112131221123113111231121123222112132113213221133112132123123112111312211322311211133112111312211213211311123113223112111321322123122113222122211211232221121113122113121113222123211211131211121311121321123113213221121113122123211211131221121311121312211213211321322112311311222113311213212322211211131221131211221321123113213221121113122113121113222112131112131221121321131211132221121321132132211331121321232221123113112221131112311322311211131122211213211331121321122112133221121113122113121113222123112221221321132132211231131122211331121321232221121113122113121113222123211211131211121332211213111213122112132113121113222112132113213221232112111312111213322112132113213221133112132123123112111311222112132113311213211221121332211231131122211311123113321112131221123113112221132231131122211211131221131112311332211213211321223112111311222112132113212221132221222112112322211211131221131211132221232112111312111213111213211231131112311311221122132113213221133112132123222112311311222113111231132231121113112221121321133112132112211213322112111312211312111322212321121113121112131112132112311321322112111312212321121113122122211211232221121311121312211213211312111322211213211321322123211211131211121332211213211321322113311213211322132112311321322112111312212321121113122122211211232221121321132132211331121321231231121113112221121321133112132112312321123113112221121113122113111231133221121321132122311211131122211213211321222113222122211211232221123113112221131112311332111213122112311311123112111331121113122112132113121113222112311311221112131221123113112221121113311211131122211211131221131211132221121321132132212321121113121112133221123113112221131112311332111213213211221113122113121113222112132113213221232112111312111213322112132113213221133112132123123112111312211322311211133112111312212221121123222112132113213221133112132123222113223113112221131112311332111213122112311311123112112322211211131221131211132221232112111312111213111213211231132132211211131221131211221321123113213221123113112221131112211322212322211231131122211322111312211312111322211213211321322113311213211331121113122122211211132213211231131122212322211331222113112211"
-    ]
-  ]);
-
-  for (const [n, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${n}`, () => {
-      expect(countAndSay(n)).toBe(expected);
-    });
-  }
+  );
 });
diff --git a/solutions/countCompleteTreeNodes.ts b/solutions/count_complete_tree_nodes.ts
similarity index 84%
rename from solutions/countCompleteTreeNodes.ts
rename to solutions/count_complete_tree_nodes.ts
index 2d61635..006ed9f 100644
--- a/solutions/countCompleteTreeNodes.ts
+++ b/solutions/count_complete_tree_nodes.ts
@@ -1,8 +1,10 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 222. Count Complete Tree Nodes
 // https://leetcode.com/problems/count-complete-tree-nodes/
-function countNodes(root: BinaryTreeNode<number> | null): number {
+export default function countNodes(
+  root: BinaryTreeNode<number> | null
+): number {
   if (!root) return 0;
 
   const leftHeight = calculateHeight(root.left);
@@ -20,5 +22,3 @@ function countNodes(root: BinaryTreeNode<number> | null): number {
 function calculateHeight(root: BinaryTreeNode<number> | null): number {
   return root ? 1 + calculateHeight(root.left) : 0;
 }
-
-export default countNodes;
diff --git a/solutions/count_complete_tree_nodes_test.ts b/solutions/count_complete_tree_nodes_test.ts
new file mode 100644
index 0000000..f458c74
--- /dev/null
+++ b/solutions/count_complete_tree_nodes_test.ts
@@ -0,0 +1,11 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import countNodes from "./count_complete_tree_nodes.ts";
+
+test("222. Count Complete Tree Nodes", () => {
+  assert(countNodes(createBinaryTreeNode([1, 2, 3, 4, 5, 6])) === 6);
+  assert(countNodes(createBinaryTreeNode([])) === 0);
+  assert(countNodes(createBinaryTreeNode([1, 2, 3, 4, 5, 6, 7, 8])) === 8);
+  assert(countNodes(createBinaryTreeNode([1, 2, 3, 4, 5, 6, 7])) === 7);
+});
diff --git a/solutions/countUnivalueSubtrees.ts b/solutions/count_univalue_subtrees.ts
similarity index 92%
rename from solutions/countUnivalueSubtrees.ts
rename to solutions/count_univalue_subtrees.ts
index ad74e79..23e0361 100644
--- a/solutions/countUnivalueSubtrees.ts
+++ b/solutions/count_univalue_subtrees.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 250. Count Univalue Subtrees
 // https://leetcode.com/problems/count-univalue-subtrees/
diff --git a/solutions/count_univalue_subtrees_test.ts b/solutions/count_univalue_subtrees_test.ts
new file mode 100644
index 0000000..b79570d
--- /dev/null
+++ b/solutions/count_univalue_subtrees_test.ts
@@ -0,0 +1,14 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import countUnivalSubtrees from "./count_univalue_subtrees.ts";
+
+test("250. Count Univalue Subtrees", () => {
+  assert(
+    countUnivalSubtrees(createBinaryTreeNode([5, 1, 5, 5, 5, null, 5])) === 4
+  );
+  assert(
+    countUnivalSubtrees(createBinaryTreeNode([1, 4, 3, 4, 4, 5, 6])) === 5
+  );
+  assert(countUnivalSubtrees(createBinaryTreeNode([])) === 0);
+});
diff --git a/solutions/diameterOfBinaryTree.test.ts b/solutions/diameterOfBinaryTree.test.ts
deleted file mode 100644
index 93b12c7..0000000
--- a/solutions/diameterOfBinaryTree.test.ts
+++ /dev/null
@@ -1,51 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import diameterOfBinaryTree from "./diameterOfBinaryTree";
-
-describe("543. Diameter of Binary Tree", () => {
-  const TEST_CASES = new Map([
-    [[1, 2, 3, 4, 5], 3],
-    [[1], 0],
-    [[], 0],
-    [
-      [
-        4,
-        -7,
-        -3,
-        null,
-        null,
-        -9,
-        -3,
-        9,
-        -7,
-        -4,
-        null,
-        6,
-        null,
-        -6,
-        -6,
-        null,
-        null,
-        0,
-        6,
-        5,
-        null,
-        9,
-        null,
-        null,
-        -1,
-        -4,
-        null,
-        null,
-        null,
-        -2
-      ],
-      8
-    ]
-  ]);
-
-  for (const [values, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}]`, () => {
-      expect(diameterOfBinaryTree(createBinaryTreeNode(values))).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/diameterOfBinaryTree.ts b/solutions/diameter_of_binary_tree.ts
similarity index 92%
rename from solutions/diameterOfBinaryTree.ts
rename to solutions/diameter_of_binary_tree.ts
index 834805a..f1b40df 100644
--- a/solutions/diameterOfBinaryTree.ts
+++ b/solutions/diameter_of_binary_tree.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 543. Diameter of Binary Tree
 // https://leetcode.com/problems/diameter-of-binary-tree/
diff --git a/solutions/diameter_of_binary_tree_test.ts b/solutions/diameter_of_binary_tree_test.ts
new file mode 100644
index 0000000..e5dde8d
--- /dev/null
+++ b/solutions/diameter_of_binary_tree_test.ts
@@ -0,0 +1,46 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import diameterOfBinaryTree from "./diameter_of_binary_tree.ts";
+
+test("543. Diameter of Binary Tree", () => {
+  assert(diameterOfBinaryTree(createBinaryTreeNode([1, 2, 3, 4, 5])) === 3);
+  assert(diameterOfBinaryTree(createBinaryTreeNode([1])) === 0);
+  assert(diameterOfBinaryTree(createBinaryTreeNode([])) === 0);
+  assert(
+    diameterOfBinaryTree(
+      createBinaryTreeNode([
+        4,
+        -7,
+        -3,
+        null,
+        null,
+        -9,
+        -3,
+        9,
+        -7,
+        -4,
+        null,
+        6,
+        null,
+        -6,
+        -6,
+        null,
+        null,
+        0,
+        6,
+        5,
+        null,
+        9,
+        null,
+        null,
+        -1,
+        -4,
+        null,
+        null,
+        null,
+        -2
+      ])
+    ) === 8
+  );
+});
diff --git a/solutions/distance_between_bus_stops.ts b/solutions/distance_between_bus_stops.ts
new file mode 100644
index 0000000..657ea01
--- /dev/null
+++ b/solutions/distance_between_bus_stops.ts
@@ -0,0 +1,23 @@
+// 1184. Distance Between Bus Stops
+// https://leetcode.com/problems/distance-between-bus-stops/
+export default function distanceBetweenBusStops(
+  distance: number[],
+  start: number,
+  destination: number
+): number {
+  const lessIndex = Math.min(start, destination);
+  const moreIndex = lessIndex === start ? destination : start;
+
+  let clockwise = 0;
+  let counterclockwise = 0;
+
+  for (let i = 0; i < distance.length; ++i) {
+    if (i < lessIndex || i >= moreIndex) {
+      counterclockwise += distance[i];
+    } else {
+      clockwise += distance[i];
+    }
+  }
+
+  return Math.min(clockwise, counterclockwise);
+}
diff --git a/solutions/distance_between_bus_stops_test.ts b/solutions/distance_between_bus_stops_test.ts
new file mode 100644
index 0000000..26135c2
--- /dev/null
+++ b/solutions/distance_between_bus_stops_test.ts
@@ -0,0 +1,9 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import distanceBetweenBusStops from "./distance_between_bus_stops.ts";
+
+test("1184. Distance Between Bus Stops", () => {
+  assert(distanceBetweenBusStops([1, 2, 3, 4], 0, 1) === 1);
+  assert(distanceBetweenBusStops([1, 2, 3, 4], 0, 2) === 3);
+  assert(distanceBetweenBusStops([1, 2, 3, 4], 0, 3) === 4);
+});
diff --git a/solutions/findFirstAndLastPositionOfElementInSortedArray.test.ts b/solutions/findFirstAndLastPositionOfElementInSortedArray.test.ts
deleted file mode 100644
index e308638..0000000
--- a/solutions/findFirstAndLastPositionOfElementInSortedArray.test.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import searchRange from "./findFirstAndLastPositionOfElementInSortedArray";
-
-describe("34. Find First and Last Position of Element in Sorted Array", () => {
-  const TEST_CASES = new Map<[number[], number], [number, number]>([
-    [[[5, 7, 7, 8, 8, 10], 8], [3, 4]],
-    [[[5, 7, 7, 8, 8, 10], 6], [-1, -1]],
-    [[[2, 2], 2], [0, 1]]
-  ]);
-
-  for (const [[nums, target], expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${nums}] and ${target}`, () => {
-      expect(searchRange(nums, target)).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/findKClosestElements.test.ts b/solutions/findKClosestElements.test.ts
deleted file mode 100644
index 0a11f29..0000000
--- a/solutions/findKClosestElements.test.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import findClosestElements from "./findKClosestElements";
-
-describe("658. Find K Closest Elements", () => {
-  const TEST_CASES = new Map<[number[], number, number], number[]>([
-    [[[1, 2, 3, 4, 5], 4, 3], [1, 2, 3, 4]],
-    [[[1, 2, 3, 4, 5], 4, -1], [1, 2, 3, 4]],
-    [[[1, 2], 1, 1], [1]],
-    [[[1, 3, 3, 4, 5, 7, 7, 8, 8, 8], 6, 6], [4, 5, 7, 7, 8, 8]]
-  ]);
-
-  for (const [[arr, k, x], expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${arr}], ${k} and ${x}`, () => {
-      expect(findClosestElements(arr, k, x)).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/findMinimumInRotatedSortedArray.test.ts b/solutions/findMinimumInRotatedSortedArray.test.ts
deleted file mode 100644
index 2f8481a..0000000
--- a/solutions/findMinimumInRotatedSortedArray.test.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import findMin from "./findMinimumInRotatedSortedArray";
-
-describe("153. Find Minimum in Rotated Sorted Array", () => {
-  const TEST_CASES = new Map([
-    [[3, 4, 5, 1, 2], 1],
-    [[4, 5, 6, 7, 0, 1, 2], 0],
-    [[3, 1, 2], 1],
-    [[1, 2, 3, 4, 5, 6], 1],
-    [[2, 1], 1],
-    [[1], 1]
-  ]);
-
-  for (const [values, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}]`, () => {
-      expect(findMin(values)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/findPeakElement.test.ts b/solutions/findPeakElement.test.ts
deleted file mode 100644
index 11f3647..0000000
--- a/solutions/findPeakElement.test.ts
+++ /dev/null
@@ -1,29 +0,0 @@
-import findPeakElement from "./findPeakElement";
-
-describe("162. Find Peak Element", () => {
-  const TEST_CASES = new Map([
-    [[1, 2, 3, 1], [2]],
-    [[1, 2, 1, 3, 5, 6, 4], [1, 5]],
-    [[2, 1], [0]],
-    [[1], [0]]
-  ]);
-
-  for (const [values, expectedOneOf] of TEST_CASES) {
-    it(`returns ${
-      expectedOneOf.length === 1
-        ? expectedOneOf[0]
-        : "either " +
-          expectedOneOf.reduce(
-            (s, v, i) =>
-              i === expectedOneOf.length - 1
-                ? `${s} or ${v}`
-                : i > 0
-                ? `${s}, ${v}`
-                : `${v}`,
-            ""
-          )
-    } when called with [${values}]`, () => {
-      expect(expectedOneOf.includes(findPeakElement(values))).toBeTruthy();
-    });
-  }
-});
diff --git a/solutions/findTheTownJudge.test.ts b/solutions/findTheTownJudge.test.ts
deleted file mode 100644
index 0e1b816..0000000
--- a/solutions/findTheTownJudge.test.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import findJudge from "./findTheTownJudge";
-
-describe("997. Find the Town Judge", () => {
-  const TEST_CASES = new Map<[number, [number, number][]], number>([
-    [[2, [[1, 2]]], 2],
-    [[3, [[1, 3], [2, 3]]], 3],
-    [[3, [[1, 3], [2, 3], [3, 1]]], -1],
-    [[3, [[1, 2], [2, 3]]], -1],
-    [[4, [[1, 3], [1, 4], [2, 3], [2, 4], [4, 3]]], 3],
-    [[1, []], 1]
-  ]);
-
-  for (const [[n, trust], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${n} and [${trust}]`, () => {
-      expect(findJudge(n, trust)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/findAllAnagramsInAString.ts b/solutions/find_all_anagrams_in_a_string.ts
similarity index 100%
rename from solutions/findAllAnagramsInAString.ts
rename to solutions/find_all_anagrams_in_a_string.ts
diff --git a/solutions/findAllAnagramsInAString.test.ts b/solutions/find_all_anagrams_in_a_string_test.ts
similarity index 97%
rename from solutions/findAllAnagramsInAString.test.ts
rename to solutions/find_all_anagrams_in_a_string_test.ts
index 4d634f9..f670a80 100644
--- a/solutions/findAllAnagramsInAString.test.ts
+++ b/solutions/find_all_anagrams_in_a_string_test.ts
@@ -1,21 +1,15 @@
-import findAnagrams from "./findAllAnagramsInAString";
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import findAnagrams from "./find_all_anagrams_in_a_string.ts";
 
-describe("438. Find All Anagrams in a String", () => {
-  const TEST_CASES = new Map([
-    [["cbaebabacd", "abc"], [0, 6]],
-    [["abab", "ab"], [0, 1, 2]],
-    [
-      [
-        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-        "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefg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pqrstuvwxyzabcdefghijklmnopqrstuvwxyz"
-      ],
-      Array.from(new Array(10063), (_, i) => i)
-    ]
-  ]);
-
-  for (const [[s, p], expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with ${s} and ${p}`, () => {
-      expect(findAnagrams(s, p)).toEqual(expected);
-    });
-  }
+test("438. Find All Anagrams in a String", () => {
+  assertEquals(findAnagrams("cbaebabacd", "abc"), [0, 6]);
+  assertEquals(findAnagrams("abab", "ab"), [0, 1, 2]);
+  assertEquals(
+    findAnagrams(
+      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+      "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"
+    ),
+    Array.from(new Array(10063), (_, i) => i)
+  );
 });
diff --git a/solutions/findFirstAndLastPositionOfElementInSortedArray.ts b/solutions/find_first_and_last_position_of_element_in_sorted_array.ts
similarity index 100%
rename from solutions/findFirstAndLastPositionOfElementInSortedArray.ts
rename to solutions/find_first_and_last_position_of_element_in_sorted_array.ts
diff --git a/solutions/find_first_and_last_position_of_element_in_sorted_array_test.ts b/solutions/find_first_and_last_position_of_element_in_sorted_array_test.ts
new file mode 100644
index 0000000..c2d67ad
--- /dev/null
+++ b/solutions/find_first_and_last_position_of_element_in_sorted_array_test.ts
@@ -0,0 +1,9 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import searchRange from "./find_first_and_last_position_of_element_in_sorted_array.ts";
+
+test("34. Find First and Last Position of Element in Sorted Array", () => {
+  assertEquals(searchRange([5, 7, 7, 8, 8, 10], 8), [3, 4]);
+  assertEquals(searchRange([5, 7, 7, 8, 8, 10], 6), [-1, -1]);
+  assertEquals(searchRange([2, 2], 2), [0, 1]);
+});
diff --git a/solutions/findKClosestElements.ts b/solutions/find_k_closest_elements.ts
similarity index 100%
rename from solutions/findKClosestElements.ts
rename to solutions/find_k_closest_elements.ts
diff --git a/solutions/find_k_closest_elements_test.ts b/solutions/find_k_closest_elements_test.ts
new file mode 100644
index 0000000..4b545b3
--- /dev/null
+++ b/solutions/find_k_closest_elements_test.ts
@@ -0,0 +1,17 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import findClosestElements from "./find_k_closest_elements.ts";
+
+test("658. Find K Closest Elements", () => {
+  assertEquals(findClosestElements([1, 2, 3, 4, 5], 4, 3), [1, 2, 3, 4]);
+  assertEquals(findClosestElements([1, 2, 3, 4, 5], 4, -1), [1, 2, 3, 4]);
+  assertEquals(findClosestElements([1, 2], 1, 1), [1]);
+  assertEquals(findClosestElements([1, 3, 3, 4, 5, 7, 7, 8, 8, 8], 6, 6), [
+    4,
+    5,
+    7,
+    7,
+    8,
+    8
+  ]);
+});
diff --git a/solutions/findMinimumInRotatedSortedArray.ts b/solutions/find_minimum_in_rotated_sorted_array.ts
similarity index 100%
rename from solutions/findMinimumInRotatedSortedArray.ts
rename to solutions/find_minimum_in_rotated_sorted_array.ts
diff --git a/solutions/find_minimum_in_rotated_sorted_array_test.ts b/solutions/find_minimum_in_rotated_sorted_array_test.ts
new file mode 100644
index 0000000..125e9ed
--- /dev/null
+++ b/solutions/find_minimum_in_rotated_sorted_array_test.ts
@@ -0,0 +1,12 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import findMin from "./find_minimum_in_rotated_sorted_array.ts";
+
+test("153. Find Minimum in Rotated Sorted Array", () => {
+  assert(findMin([3, 4, 5, 1, 2]) === 1);
+  assert(findMin([4, 5, 6, 7, 0, 1, 2]) === 0);
+  assert(findMin([3, 1, 2]) === 1);
+  assert(findMin([1, 2, 3, 4, 5, 6]) === 1);
+  assert(findMin([2, 1]) === 1);
+  assert(findMin([1]) === 1);
+});
diff --git a/solutions/findPeakElement.ts b/solutions/find_peak_element.ts
similarity index 100%
rename from solutions/findPeakElement.ts
rename to solutions/find_peak_element.ts
diff --git a/solutions/find_peak_element_test.ts b/solutions/find_peak_element_test.ts
new file mode 100644
index 0000000..4243e98
--- /dev/null
+++ b/solutions/find_peak_element_test.ts
@@ -0,0 +1,10 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import findPeakElement from "./find_peak_element.ts";
+
+test("162. Find Peak Element", () => {
+  assert(findPeakElement([1, 2, 3, 1]) === 2);
+  assert([1, 5].includes(findPeakElement([1, 2, 1, 3, 5, 6, 4])));
+  assert(findPeakElement([2, 1]) === 0);
+  assert(findPeakElement([1]) === 0);
+});
diff --git a/solutions/findTheTownJudge.ts b/solutions/find_the_town_judge.ts
similarity index 100%
rename from solutions/findTheTownJudge.ts
rename to solutions/find_the_town_judge.ts
diff --git a/solutions/find_the_town_judge_test.ts b/solutions/find_the_town_judge_test.ts
new file mode 100644
index 0000000..fb83696
--- /dev/null
+++ b/solutions/find_the_town_judge_test.ts
@@ -0,0 +1,12 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import findJudge from "./find_the_town_judge.ts";
+
+test("997. Find the Town Judge", () => {
+  assert(findJudge(2, [[1, 2]]) === 2);
+  assert(findJudge(3, [[1, 3], [2, 3]]) === 3);
+  assert(findJudge(3, [[1, 3], [2, 3], [3, 1]]) === -1);
+  assert(findJudge(3, [[1, 2], [2, 3]]) === -1);
+  assert(findJudge(4, [[1, 3], [1, 4], [2, 3], [2, 4], [4, 3]]) === 3);
+  assert(findJudge(1, []) === 1);
+});
diff --git a/solutions/firstBadVersion.test.ts b/solutions/firstBadVersion.test.ts
deleted file mode 100644
index a05afee..0000000
--- a/solutions/firstBadVersion.test.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-import solution from "./firstBadVersion";
-
-describe("278. First Bad Version", () => {
-  it("returns a function to detect the first bad version", () => {
-    const findFirstBadVersion = solution(version => version >= 4);
-
-    expect(findFirstBadVersion(5)).toBe(4);
-    expect(findFirstBadVersion(10)).toBe(4);
-  });
-});
diff --git a/solutions/firstUniqueCharacterInAString.test.ts b/solutions/firstUniqueCharacterInAString.test.ts
deleted file mode 100644
index 44c7add..0000000
--- a/solutions/firstUniqueCharacterInAString.test.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import firstUniqChar from "./firstUniqueCharacterInAString";
-
-describe("387. First Unique Character in a String", () => {
-  const TEST_CASES = new Map([
-    ["leetcode", 0],
-    ["loveleetcode", 2],
-    ["leetcodeleetcode", -1],
-    ["theleetcode", 1],
-    ["j", 0],
-    ["", -1]
-  ]);
-
-  for (const [s, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${s}`, () => {
-      expect(firstUniqChar(s)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/firstBadVersion.ts b/solutions/first_bad_version.ts
similarity index 100%
rename from solutions/firstBadVersion.ts
rename to solutions/first_bad_version.ts
diff --git a/solutions/first_bad_version_test.ts b/solutions/first_bad_version_test.ts
new file mode 100644
index 0000000..17b2009
--- /dev/null
+++ b/solutions/first_bad_version_test.ts
@@ -0,0 +1,10 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import solution from "./first_bad_version.ts";
+
+test("278. First Bad Version", () => {
+  const findFirstBadVersion = solution(version => version >= 4);
+
+  assert(findFirstBadVersion(5) === 4);
+  assert(findFirstBadVersion(10) === 4);
+});
diff --git a/solutions/firstUniqueCharacterInAString.ts b/solutions/first_unique_character_in_a_string.ts
similarity index 80%
rename from solutions/firstUniqueCharacterInAString.ts
rename to solutions/first_unique_character_in_a_string.ts
index e4db205..e127fc1 100644
--- a/solutions/firstUniqueCharacterInAString.ts
+++ b/solutions/first_unique_character_in_a_string.ts
@@ -1,6 +1,6 @@
 // 387. First Unique Character in a String
 // https://leetcode.com/problems/first-unique-character-in-a-string/
-function firstUniqChar(s: string): number {
+export default function firstUniqChar(s: string): number {
   for (let i = 0; i < s.length; ++i) {
     // if the first and last index of character are the same, it's unique
     if (s.indexOf(s[i]) === s.lastIndexOf(s[i])) return i;
@@ -8,5 +8,3 @@ function firstUniqChar(s: string): number {
 
   return -1;
 }
-
-export default firstUniqChar;
diff --git a/solutions/first_unique_character_in_a_string_test.ts b/solutions/first_unique_character_in_a_string_test.ts
new file mode 100644
index 0000000..53c2095
--- /dev/null
+++ b/solutions/first_unique_character_in_a_string_test.ts
@@ -0,0 +1,12 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import firstUniqChar from "./first_unique_character_in_a_string.ts";
+
+test("387. First Unique Character in a String", () => {
+  assert(firstUniqChar("leetcode") === 0);
+  assert(firstUniqChar("loveleetcode") === 2);
+  assert(firstUniqChar("leetcodeleetcode") === -1);
+  assert(firstUniqChar("theleetcode") === 1);
+  assert(firstUniqChar("j") === 0);
+  assert(firstUniqChar("") === -1);
+});
diff --git a/solutions/fizzBuzz.test.ts b/solutions/fizzBuzz.test.ts
deleted file mode 100644
index 6b80672..0000000
--- a/solutions/fizzBuzz.test.ts
+++ /dev/null
@@ -1,40 +0,0 @@
-import fizzBuzz from "./fizzBuzz";
-
-describe("412. Fizz Buzz", () => {
-  const TEST_CASES = new Map([
-    [1, ["1"]],
-    [3, ["1", "2", "Fizz"]],
-    [5, ["1", "2", "Fizz", "4", "Buzz"]],
-    [
-      20,
-      [
-        "1",
-        "2",
-        "Fizz",
-        "4",
-        "Buzz",
-        "Fizz",
-        "7",
-        "8",
-        "Fizz",
-        "Buzz",
-        "11",
-        "Fizz",
-        "13",
-        "14",
-        "FizzBuzz",
-        "16",
-        "17",
-        "Fizz",
-        "19",
-        "Buzz"
-      ]
-    ]
-  ]);
-
-  for (const [n, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${n}`, () => {
-      expect(fizzBuzz(n)).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/fizzBuzz.ts b/solutions/fizz_buzz.ts
similarity index 84%
rename from solutions/fizzBuzz.ts
rename to solutions/fizz_buzz.ts
index 7925e5b..c2d4906 100644
--- a/solutions/fizzBuzz.ts
+++ b/solutions/fizz_buzz.ts
@@ -1,6 +1,6 @@
 // 412. Fizz Buzz
 // https://leetcode.com/problems/fizz-buzz/
-function fizzBuzz(n: number): string[] {
+export default function fizzBuzz(n: number): string[] {
   const arr: string[] = [];
 
   for (let i = 1; i <= n; ++i) {
@@ -17,5 +17,3 @@ function fizzBuzz(n: number): string[] {
 
   return arr;
 }
-
-export default fizzBuzz;
diff --git a/solutions/fizz_buzz_test.ts b/solutions/fizz_buzz_test.ts
new file mode 100644
index 0000000..8947f5a
--- /dev/null
+++ b/solutions/fizz_buzz_test.ts
@@ -0,0 +1,31 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import fizzBuzz from "./fizz_buzz.ts";
+
+test("412. Fizz Buzz", () => {
+  assertEquals(fizzBuzz(1), ["1"]);
+  assertEquals(fizzBuzz(3), ["1", "2", "Fizz"]);
+  assertEquals(fizzBuzz(5), ["1", "2", "Fizz", "4", "Buzz"]);
+  assertEquals(fizzBuzz(20), [
+    "1",
+    "2",
+    "Fizz",
+    "4",
+    "Buzz",
+    "Fizz",
+    "7",
+    "8",
+    "Fizz",
+    "Buzz",
+    "11",
+    "Fizz",
+    "13",
+    "14",
+    "FizzBuzz",
+    "16",
+    "17",
+    "Fizz",
+    "19",
+    "Buzz"
+  ]);
+});
diff --git a/solutions/flipping_an_image.ts b/solutions/flipping_an_image.ts
new file mode 100644
index 0000000..ee27bce
--- /dev/null
+++ b/solutions/flipping_an_image.ts
@@ -0,0 +1,11 @@
+// 832. Flipping an Image
+// https://leetcode.com/problems/flipping-an-image/
+export default function flipAndInvertImage(a: (1 | 0)[][]): (1 | 0)[][] {
+  for (const row of a) {
+    for (let l = 0, r = row.length - 1; l <= r; ++l, --r) {
+      [row[l], row[r]] = [-row[r] + 1, -row[l] + 1] as (1 | 0)[];
+    }
+  }
+
+  return a;
+}
diff --git a/solutions/flipping_an_image_test.ts b/solutions/flipping_an_image_test.ts
new file mode 100644
index 0000000..cdd7537
--- /dev/null
+++ b/solutions/flipping_an_image_test.ts
@@ -0,0 +1,20 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import flipAndInvertImage from "./flipping_an_image.ts";
+
+test("832. Flipping an Image", () => {
+  assertEquals(flipAndInvertImage([[1, 1, 0], [1, 0, 1], [0, 0, 0]]), [
+    [1, 0, 0],
+    [0, 1, 0],
+    [1, 1, 1]
+  ]);
+  assertEquals(
+    flipAndInvertImage([
+      [1, 1, 0, 0],
+      [1, 0, 0, 1],
+      [0, 1, 1, 1],
+      [1, 0, 1, 0]
+    ]),
+    [[1, 1, 0, 0], [0, 1, 1, 0], [0, 0, 0, 1], [1, 0, 1, 0]]
+  );
+});
diff --git a/solutions/floodFill.test.ts b/solutions/floodFill.test.ts
deleted file mode 100644
index 147a6d1..0000000
--- a/solutions/floodFill.test.ts
+++ /dev/null
@@ -1,47 +0,0 @@
-import floodFill from "./floodFill";
-
-describe("733. Flood Fill", () => {
-  const TEST_CASES = new Map<[number[][], number, number, number], number[][]>([
-    [
-      [[[1, 1, 1], [1, 1, 0], [1, 0, 1]], 1, 1, 2],
-      [[2, 2, 2], [2, 2, 0], [2, 0, 1]]
-    ],
-    [
-      [
-        [
-          [0, 0, 0, 0, 0],
-          [0, 1, 1, 1, 1],
-          [0, 1, 0, 0, 0],
-          [0, 1, 0, 0, 0],
-          [0, 1, 0, 0, 0]
-        ],
-        3,
-        3,
-        255
-      ],
-      [
-        [0, 0, 0, 0, 0],
-        [0, 1, 1, 1, 1],
-        [0, 1, 255, 255, 255],
-        [0, 1, 255, 255, 255],
-        [0, 1, 255, 255, 255]
-      ]
-    ],
-    [[[[0, 0, 0], [0, 1, 1]], 1, 1, 1], [[0, 0, 0], [0, 1, 1]]]
-  ]);
-
-  for (const [
-    [image, startingRow, startingColumn, newColor],
-    expected
-  ] of TEST_CASES) {
-    it(`returns [${expected.map(
-      row => `[${row}]`
-    )}] when called with [${image.map(
-      row => `[${row}]`
-    )}], ${startingRow}, ${startingColumn} and ${newColor}`, () => {
-      expect(floodFill(image, startingRow, startingColumn, newColor)).toEqual(
-        expected
-      );
-    });
-  }
-});
diff --git a/solutions/floodFill.ts b/solutions/flood_fill.ts
similarity index 95%
rename from solutions/floodFill.ts
rename to solutions/flood_fill.ts
index e13b594..d98daed 100644
--- a/solutions/floodFill.ts
+++ b/solutions/flood_fill.ts
@@ -1,6 +1,6 @@
 // 733. Flood Fill
 // https://leetcode.com/problems/flood-fill/
-function floodFill(
+export default function floodFill(
   image: number[][],
   startingRow: number,
   startingColumn: number,
@@ -45,5 +45,3 @@ function floodFill(
 
 // [row, column]
 type PixelPosition = [number, number];
-
-export default floodFill;
diff --git a/solutions/flood_fill_test.ts b/solutions/flood_fill_test.ts
new file mode 100644
index 0000000..01d16ff
--- /dev/null
+++ b/solutions/flood_fill_test.ts
@@ -0,0 +1,36 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import floodFill from "./flood_fill.ts";
+
+test("733. Flood Fill", () => {
+  assertEquals(floodFill([[1, 1, 1], [1, 1, 0], [1, 0, 1]], 1, 1, 2), [
+    [2, 2, 2],
+    [2, 2, 0],
+    [2, 0, 1]
+  ]);
+  assertEquals(
+    floodFill(
+      [
+        [0, 0, 0, 0, 0],
+        [0, 1, 1, 1, 1],
+        [0, 1, 0, 0, 0],
+        [0, 1, 0, 0, 0],
+        [0, 1, 0, 0, 0]
+      ],
+      3,
+      3,
+      255
+    ),
+    [
+      [0, 0, 0, 0, 0],
+      [0, 1, 1, 1, 1],
+      [0, 1, 255, 255, 255],
+      [0, 1, 255, 255, 255],
+      [0, 1, 255, 255, 255]
+    ]
+  );
+  assertEquals(floodFill([[0, 0, 0], [0, 1, 1]], 1, 1, 1), [
+    [0, 0, 0],
+    [0, 1, 1]
+  ]);
+});
diff --git a/solutions/happyNumber.test.ts b/solutions/happyNumber.test.ts
deleted file mode 100644
index 37f3ac8..0000000
--- a/solutions/happyNumber.test.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import isHappy from "./happyNumber";
-
-describe("202. Happy Number", () => {
-  const TEST_CASES = new Map([[19, true], [18, false]]);
-
-  for (const [n, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${n}`, () => {
-      expect(isHappy(n)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/happyNumber.ts b/solutions/happy_number.ts
similarity index 83%
rename from solutions/happyNumber.ts
rename to solutions/happy_number.ts
index 8e77c1b..4d49188 100644
--- a/solutions/happyNumber.ts
+++ b/solutions/happy_number.ts
@@ -1,6 +1,6 @@
 // 202. Happy Number
 // https://leetcode.com/problems/happy-number/
-function isHappy(n: number): boolean {
+export default function isHappy(n: number): boolean {
   if (n === 1) return true;
 
   // any non-happy number is going to be 4 at certain point
@@ -12,5 +12,3 @@ function isHappy(n: number): boolean {
       .reduce((total, digit) => total + Math.pow(parseInt(digit), 2), 0)
   );
 }
-
-export default isHappy;
diff --git a/solutions/happy_number_test.ts b/solutions/happy_number_test.ts
new file mode 100644
index 0000000..250b909
--- /dev/null
+++ b/solutions/happy_number_test.ts
@@ -0,0 +1,8 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import isHappy from "./happy_number.ts";
+
+test("202. Happy Number", () => {
+  assert(isHappy(19) === true);
+  assert(isHappy(18) === false);
+});
diff --git a/solutions/houseRobber.test.ts b/solutions/houseRobber.test.ts
deleted file mode 100644
index 0e8ead1..0000000
--- a/solutions/houseRobber.test.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import rob from "./houseRobber";
-
-describe("198. House Robber", () => {
-  const TEST_CASES = new Map([
-    [[1, 2, 3, 1], 4],
-    [[2, 7, 9, 3, 1], 12],
-    [[2, 4, 9, 3, 1, 5], 16]
-  ]);
-
-  for (const [nums, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${nums}]`, () => {
-      expect(rob(nums)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/houseRobber.ts b/solutions/house_robber.ts
similarity index 88%
rename from solutions/houseRobber.ts
rename to solutions/house_robber.ts
index 9178168..2e67dd9 100644
--- a/solutions/houseRobber.ts
+++ b/solutions/house_robber.ts
@@ -1,6 +1,6 @@
 // 198. House Robber
 // https://leetcode.com/problems/house-robber/
-function rob(nums: number[]): number {
+export default function rob(nums: number[]): number {
   // this is dynamic programming.
   // see https://github.com/axross/leetcode-typescript/pull/55
   const dp = new Map([[-1, 0], [0, 0]]);
@@ -13,5 +13,3 @@ function rob(nums: number[]): number {
   // dp[nums.length] is the maximum amount
   return dp.get(nums.length)!;
 }
-
-export default rob;
diff --git a/solutions/house_robber_test.ts b/solutions/house_robber_test.ts
new file mode 100644
index 0000000..9fbd0f2
--- /dev/null
+++ b/solutions/house_robber_test.ts
@@ -0,0 +1,9 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import rob from "./house_robber.ts";
+
+test("198. House Robber", () => {
+  assert(rob([1, 2, 3, 1]) === 4);
+  assert(rob([2, 7, 9, 3, 1]) === 12);
+  assert(rob([2, 4, 9, 3, 1, 5]) === 16);
+});
diff --git a/solutions/implementStrstr.test.ts b/solutions/implementStrstr.test.ts
deleted file mode 100644
index 9968ba1..0000000
--- a/solutions/implementStrstr.test.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import strStr from "./implementStrstr";
-
-describe("28. Implement strStr()", () => {
-  const TEST_CASES = new Map([
-    [["hello", "ll"], 2],
-    [["aaaaa", "bba"], -1],
-    [["llooll", "ll"], 0],
-    [["llooll", "ool"], 2],
-    [["hello", ""], 0],
-    [["", "a"], -1],
-    [["", ""], 0],
-    [["aaa", "aaaa"], -1],
-    [["hello", "lo"], 3]
-  ]);
-
-  for (const [[haystack, needle], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${haystack}] and ${needle}`, () => {
-      expect(strStr(haystack, needle)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/implementStrstr.ts b/solutions/implement_strstr.ts
similarity index 72%
rename from solutions/implementStrstr.ts
rename to solutions/implement_strstr.ts
index 2c9be0e..6c35786 100644
--- a/solutions/implementStrstr.ts
+++ b/solutions/implement_strstr.ts
@@ -1,6 +1,6 @@
 // 28. Implement strStr()
 // https://leetcode.com/problems/implement-strstr/
-function strStr(haystack: string, needle: string): number {
+export default function strStr(haystack: string, needle: string): number {
   for (let i = 0; i <= haystack.length - needle.length; ++i) {
     if (haystack.startsWith(needle, i)) {
       return i;
@@ -9,5 +9,3 @@ function strStr(haystack: string, needle: string): number {
 
   return -1;
 }
-
-export default strStr;
diff --git a/solutions/implement_strstr_test.ts b/solutions/implement_strstr_test.ts
new file mode 100644
index 0000000..6596208
--- /dev/null
+++ b/solutions/implement_strstr_test.ts
@@ -0,0 +1,15 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import strStr from "./implement_strstr.ts";
+
+test("28. Implement strStr()", () => {
+  assert(strStr("hello", "ll") === 2);
+  assert(strStr("aaaaa", "bba") === -1);
+  assert(strStr("llooll", "ll") === 0);
+  assert(strStr("llooll", "ool") === 2);
+  assert(strStr("hello", "") === 0);
+  assert(strStr("", "a") === -1);
+  assert(strStr("", "") === 0);
+  assert(strStr("aaa", "aaaa") === -1);
+  assert(strStr("hello", "lo") === 3);
+});
diff --git a/solutions/intersectionOfTwoArrays.test.ts b/solutions/intersectionOfTwoArrays.test.ts
deleted file mode 100644
index 595db7c..0000000
--- a/solutions/intersectionOfTwoArrays.test.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import intersection from "./intersectionOfTwoArrays";
-
-describe("349. Intersection of Two Arrays", () => {
-  const TEST_CASES = new Map<[number[], number[]], number[]>([
-    [[[1, 2, 2, 1], [2, 2]], [2]],
-    [[[4, 9, 5], [9, 4, 9, 8, 4]], [9, 4]]
-  ]);
-
-  for (const [[nums1, nums2], expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${nums1}] and [${nums2}]`, () => {
-      expect(intersection(nums1, nums2)).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/intersectionOfTwoArrays2.test.ts b/solutions/intersectionOfTwoArrays2.test.ts
deleted file mode 100644
index c6436c6..0000000
--- a/solutions/intersectionOfTwoArrays2.test.ts
+++ /dev/null
@@ -1,147 +0,0 @@
-import intersect from "./intersectionOfTwoArrays2";
-
-describe("350. Intersection of Two Arrays II", () => {
-  const TEST_CASES = new Map<[number[], number[]], number[]>([
-    [[[1, 2, 2, 1], [2, 2]], [2, 2]],
-    [[[4, 9, 5], [9, 4, 9, 8, 4]], [4, 9]],
-    [
-      [
-        [
-          61,
-          24,
-          20,
-          58,
-          95,
-          53,
-          17,
-          32,
-          45,
-          85,
-          70,
-          20,
-          83,
-          62,
-          35,
-          89,
-          5,
-          95,
-          12,
-          86,
-          58,
-          77,
-          30,
-          64,
-          46,
-          13,
-          5,
-          92,
-          67,
-          40,
-          20,
-          38,
-          31,
-          18,
-          89,
-          85,
-          7,
-          30,
-          67,
-          34,
-          62,
-          35,
-          47,
-          98,
-          3,
-          41,
-          53,
-          26,
-          66,
-          40,
-          54,
-          44,
-          57,
-          46,
-          70,
-          60,
-          4,
-          63,
-          82,
-          42,
-          65,
-          59,
-          17,
-          98,
-          29,
-          72,
-          1,
-          96,
-          82,
-          66,
-          98,
-          6,
-          92,
-          31,
-          43,
-          81,
-          88,
-          60,
-          10,
-          55,
-          66,
-          82,
-          0,
-          79,
-          11,
-          81
-        ],
-        [
-          5,
-          25,
-          4,
-          39,
-          57,
-          49,
-          93,
-          79,
-          7,
-          8,
-          49,
-          89,
-          2,
-          7,
-          73,
-          88,
-          45,
-          15,
-          34,
-          92,
-          84,
-          38,
-          85,
-          34,
-          16,
-          6,
-          99,
-          0,
-          2,
-          36,
-          68,
-          52,
-          73,
-          50,
-          77,
-          44,
-          61,
-          48
-        ]
-      ],
-      [0, 4, 5, 6, 7, 34, 38, 44, 45, 57, 61, 77, 79, 85, 88, 89, 92]
-    ]
-  ]);
-
-  for (const [[nums1, nums2], expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${nums1}] and [${nums2}]`, () => {
-      expect(intersect(nums1, nums2).sort((a, b) => a - b)).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/intersectionOfTwoLinkedLists.test.ts b/solutions/intersectionOfTwoLinkedLists.test.ts
deleted file mode 100644
index aa5a2e5..0000000
--- a/solutions/intersectionOfTwoLinkedLists.test.ts
+++ /dev/null
@@ -1,30 +0,0 @@
-import {
-  createSinglyLinkedListNode,
-  getNthNode
-} from "../testUtilities/LinkedList";
-import { SinglyLinkedListNode } from "../types/LinkedList";
-import getIntersectionNode from "./intersectionOfTwoLinkedLists";
-
-describe("160. Intersection of Two Linked Lists", () => {
-  const TEST_CASES: [any, number[], number[], number, number][] = [
-    [8, [4, 1, 8, 4, 5], [5, 0, 1, 8, 4, 5], 2, 3],
-    [2, [0, 9, 1, 2, 4], [3, 2, 4], 3, 1],
-    [0, [2, 6, 4], [1, 5], 3, 2]
-  ];
-
-  for (const [, valuesA, valuesB, skipA, skipB] of TEST_CASES) {
-    const headA = createSinglyLinkedListNode(valuesA);
-    const headB = createSinglyLinkedListNode(valuesB);
-    let intersection: SinglyLinkedListNode<number> | null = null;
-
-    if (skipA < valuesA.length) {
-      intersection = getNthNode(headA!, skipA);
-
-      getNthNode(headB!, skipB - 1).next = intersection;
-    }
-
-    it(`returns the ${skipA}th node of "linked list A" when called with [${valuesA}], [${valuesB}], ${skipA} and ${skipB}`, () => {
-      expect(getIntersectionNode(headA, headB)).toBe(intersection);
-    });
-  }
-});
diff --git a/solutions/intersectionOfTwoArrays.ts b/solutions/intersection_of_two_arrays.ts
similarity index 77%
rename from solutions/intersectionOfTwoArrays.ts
rename to solutions/intersection_of_two_arrays.ts
index add31bd..2ec6ed0 100644
--- a/solutions/intersectionOfTwoArrays.ts
+++ b/solutions/intersection_of_two_arrays.ts
@@ -1,6 +1,9 @@
 // 349. Intersection of Two Arrays
 // https://leetcode.com/problems/intersection-of-two-arrays/
-function intersection(nums1: number[], nums2: number[]): number[] {
+export default function intersection(
+  nums1: number[],
+  nums2: number[]
+): number[] {
   const set = new Set();
   const result: number[] = [];
 
@@ -17,5 +20,3 @@ function intersection(nums1: number[], nums2: number[]): number[] {
 
   return result;
 }
-
-export default intersection;
diff --git a/solutions/intersectionOfTwoArrays2.ts b/solutions/intersection_of_two_arrays2.ts
similarity index 100%
rename from solutions/intersectionOfTwoArrays2.ts
rename to solutions/intersection_of_two_arrays2.ts
diff --git a/solutions/intersection_of_two_arrays2_test.ts b/solutions/intersection_of_two_arrays2_test.ts
new file mode 100644
index 0000000..3ed968e
--- /dev/null
+++ b/solutions/intersection_of_two_arrays2_test.ts
@@ -0,0 +1,141 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import intersect from "./intersection_of_two_arrays2.ts";
+
+test("350. Intersection of Two Arrays II", () => {
+  assertEquals(intersect([1, 2, 2, 1], [2, 2]), [2, 2]);
+  assertEquals(intersect([4, 9, 5], [9, 4, 9, 8, 4]), [4, 9]);
+  assertEquals(
+    intersect(
+      [
+        61,
+        24,
+        20,
+        58,
+        95,
+        53,
+        17,
+        32,
+        45,
+        85,
+        70,
+        20,
+        83,
+        62,
+        35,
+        89,
+        5,
+        95,
+        12,
+        86,
+        58,
+        77,
+        30,
+        64,
+        46,
+        13,
+        5,
+        92,
+        67,
+        40,
+        20,
+        38,
+        31,
+        18,
+        89,
+        85,
+        7,
+        30,
+        67,
+        34,
+        62,
+        35,
+        47,
+        98,
+        3,
+        41,
+        53,
+        26,
+        66,
+        40,
+        54,
+        44,
+        57,
+        46,
+        70,
+        60,
+        4,
+        63,
+        82,
+        42,
+        65,
+        59,
+        17,
+        98,
+        29,
+        72,
+        1,
+        96,
+        82,
+        66,
+        98,
+        6,
+        92,
+        31,
+        43,
+        81,
+        88,
+        60,
+        10,
+        55,
+        66,
+        82,
+        0,
+        79,
+        11,
+        81
+      ],
+      [
+        5,
+        25,
+        4,
+        39,
+        57,
+        49,
+        93,
+        79,
+        7,
+        8,
+        49,
+        89,
+        2,
+        7,
+        73,
+        88,
+        45,
+        15,
+        34,
+        92,
+        84,
+        38,
+        85,
+        34,
+        16,
+        6,
+        99,
+        0,
+        2,
+        36,
+        68,
+        52,
+        73,
+        50,
+        77,
+        44,
+        61,
+        48
+      ]
+    ),
+    [0, 4, 5, 6, 7, 34, 38, 44, 45, 57, 61, 77, 79, 85, 88, 89, 92]
+  );
+});
diff --git a/solutions/intersection_of_two_arrays_test.ts b/solutions/intersection_of_two_arrays_test.ts
new file mode 100644
index 0000000..180c38f
--- /dev/null
+++ b/solutions/intersection_of_two_arrays_test.ts
@@ -0,0 +1,8 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import intersection from "./intersection_of_two_arrays.ts";
+
+test("349. Intersection of Two Arrays", () => {
+  assertEquals(intersection([1, 2, 2, 1], [2, 2]), [2]);
+  assertEquals(intersection([4, 9, 5], [9, 4, 9, 8, 4]), [9, 4]);
+});
diff --git a/solutions/intersectionOfTwoLinkedLists.ts b/solutions/intersection_of_two_linked_lists.ts
similarity index 86%
rename from solutions/intersectionOfTwoLinkedLists.ts
rename to solutions/intersection_of_two_linked_lists.ts
index 0fc2b63..f4332b1 100644
--- a/solutions/intersectionOfTwoLinkedLists.ts
+++ b/solutions/intersection_of_two_linked_lists.ts
@@ -1,4 +1,4 @@
-import { SinglyLinkedListNode } from "../types/LinkedList";
+import { SinglyLinkedListNode } from "../types/linked_list.ts";
 
 // 160. Intersection of Two Linked Lists
 // https://leetcode.com/problems/intersection-of-two-linked-lists/
diff --git a/solutions/intersection_of_two_linked_lists_test.ts b/solutions/intersection_of_two_linked_lists_test.ts
new file mode 100644
index 0000000..eab8a57
--- /dev/null
+++ b/solutions/intersection_of_two_linked_lists_test.ts
@@ -0,0 +1,30 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import {
+  createSinglyLinkedListNode,
+  getNthNode
+} from "../test_utilities/linked_list.ts";
+import getIntersectionNode from "./intersection_of_two_linked_lists.ts";
+
+test("160. Intersection of Two Linked Lists", () => {
+  const headA1 = createSinglyLinkedListNode([4, 1, 8, 4, 5]);
+  const headB1 = createSinglyLinkedListNode([5, 0, 1, 8, 4, 5]);
+  const intersection1 = getNthNode(headA1!, 2);
+
+  getNthNode(headB1!, 2).next = intersection1;
+
+  assert(getIntersectionNode(headA1, headB1) === intersection1);
+
+  const headA2 = createSinglyLinkedListNode([0, 9, 1, 2, 4]);
+  const headB2 = createSinglyLinkedListNode([3, 2, 4]);
+  const intersection2 = getNthNode(headA2!, 3);
+
+  getNthNode(headB2!, 0).next = intersection2;
+
+  assert(getIntersectionNode(headA1, headB1) === intersection1);
+
+  const headA3 = createSinglyLinkedListNode([2, 6, 4]);
+  const headB3 = createSinglyLinkedListNode([1, 5]);
+
+  assert(getIntersectionNode(headA3, headB3) === null);
+});
diff --git a/solutions/licenseKeyFormatting.test.ts b/solutions/licenseKeyFormatting.test.ts
deleted file mode 100644
index 0c39798..0000000
--- a/solutions/licenseKeyFormatting.test.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import licenseKeyFormatting from "./licenseKeyFormatting";
-
-describe("482. License Key Formatting", () => {
-  const TEST_CASES = new Map<[string, number], string>([
-    [["5F3Z-2e-9-w", 4], "5F3Z-2E9W"],
-    [["2-5g-3-J", 2], "2-5G-3J"]
-  ]);
-
-  for (const [[s, k], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${s} and ${k}`, () => {
-      expect(licenseKeyFormatting(s, k)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/licenseKeyFormatting.ts b/solutions/license_key_formatting.ts
similarity index 79%
rename from solutions/licenseKeyFormatting.ts
rename to solutions/license_key_formatting.ts
index d790607..c25a6bb 100644
--- a/solutions/licenseKeyFormatting.ts
+++ b/solutions/license_key_formatting.ts
@@ -1,6 +1,6 @@
 // 482. License Key Formatting
 // https://leetcode.com/problems/license-key-formatting/
-function licenseKeyFormatting(S: string, K: number): string {
+export default function licenseKeyFormatting(S: string, K: number): string {
   const squashed = S.replace(/-/g, "");
   let formatted = "";
 
@@ -12,5 +12,3 @@ function licenseKeyFormatting(S: string, K: number): string {
 
   return formatted.toUpperCase();
 }
-
-export default licenseKeyFormatting;
diff --git a/solutions/license_key_formatting_test.ts b/solutions/license_key_formatting_test.ts
new file mode 100644
index 0000000..eb79026
--- /dev/null
+++ b/solutions/license_key_formatting_test.ts
@@ -0,0 +1,8 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import licenseKeyFormatting from "./license_key_formatting.ts";
+
+test("482. License Key Formatting", () => {
+  assert(licenseKeyFormatting("5F3Z-2e-9-w", 4) === "5F3Z-2E9W");
+  assert(licenseKeyFormatting("2-5g-3-J", 2) === "2-5G-3J");
+});
diff --git a/solutions/linkedListCycle.test.ts b/solutions/linkedListCycle.test.ts
deleted file mode 100644
index d1ed491..0000000
--- a/solutions/linkedListCycle.test.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-import {
-  createSinglyLinkedListNode,
-  getNthNode
-} from "../testUtilities/LinkedList";
-import hasCycle from "./linkedListCycle";
-
-describe("141. Linked List Cycle", () => {
-  const TEST_CASES = new Map<[number[], number], boolean>([
-    [[[3, 2, 0, -4], 1], true],
-    [[[3, 2, 0, -4], -1], false],
-    [[[3, 2, 0, -4], 3], true]
-  ]);
-
-  for (const [[values, cycleStart], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}] ${
-      cycleStart === -1 ? "(no cycle)" : `(cycle starts from ${cycleStart})`
-    }`, () => {
-      const head = createSinglyLinkedListNode(values)!;
-
-      if (cycleStart !== -1) {
-        getNthNode(head, -1).next = getNthNode(head, cycleStart);
-      }
-
-      expect(hasCycle(head)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/linkedListCycle.ts b/solutions/linked_list_cycle.ts
similarity index 86%
rename from solutions/linkedListCycle.ts
rename to solutions/linked_list_cycle.ts
index b3e0f3b..648d649 100644
--- a/solutions/linkedListCycle.ts
+++ b/solutions/linked_list_cycle.ts
@@ -1,4 +1,4 @@
-import { SinglyLinkedListNode } from "../types/LinkedList";
+import { SinglyLinkedListNode } from "../types/linked_list.ts";
 
 // 141. Linked List Cycle
 // https://leetcode.com/problems/linked-list-cycle/
diff --git a/solutions/linked_list_cycle_test.ts b/solutions/linked_list_cycle_test.ts
new file mode 100644
index 0000000..be2cfc9
--- /dev/null
+++ b/solutions/linked_list_cycle_test.ts
@@ -0,0 +1,25 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import {
+  createSinglyLinkedListNode,
+  getNthNode
+} from "../test_utilities/linked_list.ts";
+import hasCycle from "./linked_list_cycle.ts";
+
+test("141. Linked List Cycle", () => {
+  const node1 = createSinglyLinkedListNode([3, 2, 0, -4])!;
+
+  getNthNode(node1, -1).next = getNthNode(node1, 1);
+
+  assert(hasCycle(node1) === true);
+
+  const node2 = createSinglyLinkedListNode([3, 2, 0, -4])!;
+
+  assert(hasCycle(node2) === false);
+
+  const node3 = createSinglyLinkedListNode([3, 2, 0, -4])!;
+
+  getNthNode(node3, -1).next = getNthNode(node3, 3);
+
+  assert(hasCycle(node3) === true);
+});
diff --git a/solutions/loggerRateLimiter.test.ts b/solutions/loggerRateLimiter.test.ts
deleted file mode 100644
index 6824a07..0000000
--- a/solutions/loggerRateLimiter.test.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import Logger from "./loggerRateLimiter";
-
-describe("359. Logger Rate Limiter", () => {
-  describe("Logger#shouldPrintMessage", () => {
-    it("returns boolean value by usage until the time", () => {
-      const logger = new Logger();
-
-      expect(logger.shouldPrintMessage(1, "foo")).toBe(true);
-      expect(logger.shouldPrintMessage(2, "bar")).toBe(true);
-      expect(logger.shouldPrintMessage(3, "foo")).toBe(false);
-      expect(logger.shouldPrintMessage(8, "bar")).toBe(false);
-      expect(logger.shouldPrintMessage(10, "foo")).toBe(false);
-      expect(logger.shouldPrintMessage(11, "foo")).toBe(true);
-    });
-  });
-});
diff --git a/solutions/loggerRateLimiter.ts b/solutions/logger_rate_limiter.ts
similarity index 92%
rename from solutions/loggerRateLimiter.ts
rename to solutions/logger_rate_limiter.ts
index d17cfd4..a72ba60 100644
--- a/solutions/loggerRateLimiter.ts
+++ b/solutions/logger_rate_limiter.ts
@@ -1,6 +1,6 @@
 // 359. Logger Rate Limiter
 // https://leetcode.com/problems/logger-rate-limiter/
-class Logger {
+export default class Logger {
   lastPrintedSecondEachMessage = new Map<string, number>();
 
   shouldPrintMessage(timestamp: number, message: string): boolean {
@@ -15,5 +15,3 @@ class Logger {
     return false;
   }
 }
-
-export default Logger;
diff --git a/solutions/logger_rate_limiter_test.ts b/solutions/logger_rate_limiter_test.ts
new file mode 100644
index 0000000..39aeefc
--- /dev/null
+++ b/solutions/logger_rate_limiter_test.ts
@@ -0,0 +1,14 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import Logger from "./logger_rate_limiter.ts";
+
+test("359. Logger Rate Limiter", () => {
+  const logger = new Logger();
+
+  assert(logger.shouldPrintMessage(1, "foo") === true);
+  assert(logger.shouldPrintMessage(2, "bar") === true);
+  assert(logger.shouldPrintMessage(3, "foo") === false);
+  assert(logger.shouldPrintMessage(8, "bar") === false);
+  assert(logger.shouldPrintMessage(10, "foo") === false);
+  assert(logger.shouldPrintMessage(11, "foo") === true);
+});
diff --git a/solutions/longestCommonPrefix.test.ts b/solutions/longestCommonPrefix.test.ts
deleted file mode 100644
index 74878c6..0000000
--- a/solutions/longestCommonPrefix.test.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import longestCommonPrefix from "./longestCommonPrefix";
-
-describe("14. Longest Common Prefix", () => {
-  const TEST_CASES = new Map([
-    [["flower", "flow", "flight"], "fl"],
-    [["dog", "racecar", "car"], ""],
-    [["aca", "cba"], ""],
-    [[""], ""],
-    [["a"], "a"],
-    [["a", "b"], ""]
-  ]);
-
-  for (const [strs, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${strs}]`, () => {
-      expect(longestCommonPrefix(strs)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/longestCommonPrefix.ts b/solutions/longest_common_prefix.ts
similarity index 86%
rename from solutions/longestCommonPrefix.ts
rename to solutions/longest_common_prefix.ts
index 5dc029a..8d603f6 100644
--- a/solutions/longestCommonPrefix.ts
+++ b/solutions/longest_common_prefix.ts
@@ -1,6 +1,6 @@
 // 14. Longest Common Prefix
 // https://leetcode.com/problems/longest-common-prefix/
-function longestCommonPrefix(strs: string[]): string {
+export default function longestCommonPrefix(strs: string[]): string {
   if (strs.length === 0) {
     return "";
   }
@@ -24,5 +24,3 @@ function longestCommonPrefix(strs: string[]): string {
 
   return base.slice(0, searchFrom);
 }
-
-export default longestCommonPrefix;
diff --git a/solutions/longest_common_prefix_test.ts b/solutions/longest_common_prefix_test.ts
new file mode 100644
index 0000000..eee1d5e
--- /dev/null
+++ b/solutions/longest_common_prefix_test.ts
@@ -0,0 +1,12 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import longestCommonPrefix from "./longest_common_prefix.ts";
+
+test("14. Longest Common Prefix", () => {
+  assert(longestCommonPrefix(["flower", "flow", "flight"]) === "fl");
+  assert(longestCommonPrefix(["dog", "racecar", "car"]) === "");
+  assert(longestCommonPrefix(["aca", "cba"]) === "");
+  assert(longestCommonPrefix([""]) === "");
+  assert(longestCommonPrefix(["a"]) === "a");
+  assert(longestCommonPrefix(["a", "b"]) === "");
+});
diff --git a/solutions/longest_mountain_in_array.ts b/solutions/longest_mountain_in_array.ts
new file mode 100644
index 0000000..bf553d9
--- /dev/null
+++ b/solutions/longest_mountain_in_array.ts
@@ -0,0 +1,34 @@
+// 845. Longest Mountain in Array
+// https://leetcode.com/problems/longest-mountain-in-array/
+export default function longestMountain(a: number[]) {
+  let longestMountainLength = 0;
+  let mountainFrom = a.length;
+
+  for (let i = 1; i < a.length; ++i) {
+    const beforePrevious = i >= 2 ? a[i - 2] : Infinity;
+    const previous = a[i - 1];
+    const current = a[i];
+
+    // update mountainFrom to before when the previous is the foot of a mountain
+    if (current > previous && previous <= beforePrevious) {
+      mountainFrom = i - 1;
+      continue;
+    }
+
+    // update mountainFrom to current when there's flat terrain between current and beforePrevious
+    if (current === previous || beforePrevious === previous) {
+      mountainFrom = i;
+      continue;
+    }
+
+    // start counting mountain length in down trend
+    if (current < previous) {
+      longestMountainLength = Math.max(
+        longestMountainLength,
+        i - mountainFrom + 1
+      );
+    }
+  }
+
+  return longestMountainLength >= 3 ? longestMountainLength : 0;
+}
diff --git a/solutions/longest_mountain_in_array_test.ts b/solutions/longest_mountain_in_array_test.ts
new file mode 100644
index 0000000..17f368c
--- /dev/null
+++ b/solutions/longest_mountain_in_array_test.ts
@@ -0,0 +1,11 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import longestMountain from "./longest_mountain_in_array.ts";
+
+test("845. Longest Mountain in Array", () => {
+  assert(longestMountain([2, 1, 4, 7, 3, 2, 5]) === 5);
+  assert(longestMountain([0, 1, 2, 3, 4, 5, 4, 3, 2, 1, 0]) === 11);
+  assert(longestMountain([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]) === 0);
+  assert(longestMountain([1, 1, 0, 0, 1, 0]) === 3);
+  assert(longestMountain([2, 3, 3, 2, 0, 2]) === 0);
+});
diff --git a/solutions/longestPalindrome.ts b/solutions/longest_palindrome.ts
similarity index 100%
rename from solutions/longestPalindrome.ts
rename to solutions/longest_palindrome.ts
diff --git a/solutions/longestPalindrome.test.ts b/solutions/longest_palindrome_test.ts
similarity index 62%
rename from solutions/longestPalindrome.test.ts
rename to solutions/longest_palindrome_test.ts
index c902f1b..78ed4a2 100644
--- a/solutions/longestPalindrome.test.ts
+++ b/solutions/longest_palindrome_test.ts
@@ -1,20 +1,19 @@
-import longestPalindrome from "./longestPalindrome";
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import longestPalindrome from "./longest_palindrome.ts";
 
-describe("409. Longest Palindrome", () => {
-  const TEST_CASES = new Map([
-    ["abccccdd", 7],
-    ["bb", 2],
-    ["aaaAaaaa", 7],
-    ["zeusnilemacaronimaisanitratetartinasiaminoracamelinsuez", 55],
-    [
-      "civilwartestingwhetherthatnaptionoranynartionsoconceivedandsodedicatedcanlongendureWeareqmetonagreatbattlefiemldoftzhatwarWehavecometodedicpateaportionofthatfieldasafinalrestingplaceforthosewhoheregavetheirlivesthatthatnationmightliveItisaltogetherfangandproperthatweshoulddothisButinalargersensewecannotdedicatewecannotconsecratewecannothallowthisgroundThebravelmenlivinganddeadwhostruggledherehaveconsecrateditfaraboveourpoorponwertoaddordetractTgheworldadswfilllittlenotlenorlongrememberwhatwesayherebutitcanneverforgetwhattheydidhereItisforusthelivingrathertobededicatedheretotheulnfinishedworkwhichtheywhofoughtherehavethusfarsonoblyadvancedItisratherforustobeherededicatedtothegreattdafskremainingbeforeusthatfromthesehonoreddeadwetakeincreaseddevotiontothatcauseforwhichtheygavethelastpfullmeasureofdevotionthatweherehighlyresolvethatthesedeadshallnothavediedinvainthatthisnationunsderGodshallhaveanewbirthoffreedomandthatgovernmentofthepeoplebythepeopleforthepeopleshallnotperishfromtheearth",
-      983
-    ]
-  ]);
-
-  for (const [s, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${s}`, () => {
-      expect(longestPalindrome(s)).toBe(expected);
-    });
-  }
+test("409. Longest Palindrome", () => {
+  assert(longestPalindrome("abccccdd") === 7);
+  assert(longestPalindrome("bb") === 2);
+  assert(longestPalindrome("aaaAaaaa") === 7);
+  assert(
+    longestPalindrome(
+      "zeusnilemacaronimaisanitratetartinasiaminoracamelinsuez"
+    ) === 55
+  );
+  assert(
+    longestPalindrome(
+      "civilwartestingwhetherthatnaptionoranynartionsoconceivedandsodedicatedcanlongendureWeareqmetonagreatbattlefiemldoftzhatwarWehavecometodedicpateaportionofthatfieldasafinalrestingplaceforthosewhoheregavetheirlivesthatthatnationmightliveItisaltogetherfangandproperthatweshoulddothisButinalargersensewecannotdedicatewecannotconsecratewecannothallowthisgroundThebravelmenlivinganddeadwhostruggledherehaveconsecrateditfaraboveourpoorponwertoaddordetractTgheworldadswfilllittlenotlenorlongrememberwhatwesayherebutitcanneverforgetwhattheydidhereItisforusthelivingrathertobededicatedheretotheulnfinishedworkwhichtheywhofoughtherehavethusfarsonoblyadvancedItisratherforustobeherededicatedtothegreattdafskremainingbeforeusthatfromthesehonoreddeadwetakeincreaseddevotiontothatcauseforwhichtheygavethelastpfullmeasureofdevotionthatweherehighlyresolvethatthesedeadshallnothavediedinvainthatthisnationunsderGodshallhaveanewbirthoffreedomandthatgovernmentofthepeoplebythepeopleforthepeopleshallnotperishfromtheearth"
+    ) === 983
+  );
 });
diff --git a/solutions/lruCache.test.ts b/solutions/lruCache.test.ts
deleted file mode 100644
index 27b1164..0000000
--- a/solutions/lruCache.test.ts
+++ /dev/null
@@ -1,56 +0,0 @@
-import LRUCache from "./lruCache";
-
-describe("146. LRU Cache", () => {
-  const TEST_CASES = new Map<[string[], number[][]], (number | void)[]>([
-    [
-      [
-        [
-          "LRUCache",
-          "put",
-          "put",
-          "get",
-          "put",
-          "get",
-          "put",
-          "get",
-          "get",
-          "get"
-        ],
-        [[2], [1, 1], [2, 2], [1], [3, 3], [2], [4, 4], [1], [3], [4]]
-      ],
-      [undefined, undefined, undefined, 1, undefined, -1, undefined, -1, 3, 4]
-    ],
-    [
-      [
-        ["LRUCache", "put", "put", "put", "put", "get", "get"],
-        [[2], [2, 1], [1, 1], [2, 3], [4, 1], [1], [2]]
-      ],
-      [undefined, undefined, undefined, undefined, undefined, -1, 3]
-    ]
-  ]);
-
-  for (const [
-    [operations, operationArgs],
-    expectedValuesEachOperation
-  ] of TEST_CASES) {
-    it(`manages key-value pairs with fixed sized space`, () => {
-      let cache: LRUCache;
-
-      for (const i of operations.keys()) {
-        switch (operations[i]) {
-          case "LRUCache":
-            cache = new LRUCache(operationArgs[i][0]);
-            break;
-          case "put":
-            cache!.put(operationArgs[i][0], operationArgs[i][1]);
-            break;
-          case "get":
-            expect(cache!.get(operationArgs[i][0])).toBe(
-              expectedValuesEachOperation[i]
-            );
-            break;
-        }
-      }
-    });
-  }
-});
diff --git a/solutions/lruCache.ts b/solutions/lru_cache.ts
similarity index 95%
rename from solutions/lruCache.ts
rename to solutions/lru_cache.ts
index 1b5942e..b49ff3d 100644
--- a/solutions/lruCache.ts
+++ b/solutions/lru_cache.ts
@@ -1,6 +1,6 @@
 // 146. LRU Cache
 // https://leetcode.com/problems/lru-cache/
-class LRUCache {
+export default class LRUCache {
   constructor(capacity: number) {
     this.capacity = capacity;
   }
@@ -33,5 +33,3 @@ class LRUCache {
     this.cache.set(key, value);
   }
 }
-
-export default LRUCache;
diff --git a/solutions/lru_cache_test.ts b/solutions/lru_cache_test.ts
new file mode 100644
index 0000000..d45997a
--- /dev/null
+++ b/solutions/lru_cache_test.ts
@@ -0,0 +1,26 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import LRUCache from "./lru_cache.ts";
+
+test("146. LRU Cache", () => {
+  const lru1 = new LRUCache(2);
+
+  lru1.put(1, 1);
+  lru1.put(2, 2);
+  assert(lru1.get(1) === 1);
+  lru1.put(3, 3);
+  assert(lru1.get(2) === -1);
+  lru1.put(4, 4);
+  assert(lru1.get(1) === -1);
+  assert(lru1.get(3) === 3);
+  assert(lru1.get(4) === 4);
+
+  const lru2 = new LRUCache(2);
+
+  lru2.put(2, 1);
+  lru2.put(1, 1);
+  lru2.put(2, 3);
+  lru2.put(4, 1);
+  assert(lru2.get(1) === -1);
+  assert(lru2.get(2) === 3);
+});
diff --git a/solutions/majorityElement.test.ts b/solutions/majorityElement.test.ts
deleted file mode 100644
index 6d23ea1..0000000
--- a/solutions/majorityElement.test.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import majorityElement from "./majorityElement";
-
-describe("169. Majority Element", () => {
-  const TEST_CASES = new Map([[[3, 2, 3], 3], [[2, 2, 1, 1, 1, 2, 2], 2]]);
-
-  for (const [nums, expected] of TEST_CASES) {
-    it(`returns ${expected} when calling with [${nums}]`, () => {
-      expect(majorityElement(nums)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/majorityElement.ts b/solutions/majority_element.ts
similarity index 100%
rename from solutions/majorityElement.ts
rename to solutions/majority_element.ts
diff --git a/solutions/majority_element_test.ts b/solutions/majority_element_test.ts
new file mode 100644
index 0000000..9a8feef
--- /dev/null
+++ b/solutions/majority_element_test.ts
@@ -0,0 +1,8 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import majorityElement from "./majority_element.ts";
+
+test("169. Majority Element", () => {
+  assert(majorityElement([3, 2, 3]) === 3);
+  assert(majorityElement([2, 2, 1, 1, 1, 2, 2]) === 2);
+});
diff --git a/solutions/maxAreaOfIsland.test.ts b/solutions/maxAreaOfIsland.test.ts
deleted file mode 100644
index edcb062..0000000
--- a/solutions/maxAreaOfIsland.test.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-import maxAreaOfIsland from "./maxAreaOfIsland";
-
-describe("695. Max Area of Island", () => {
-  const TEST_CASES = new Map<(1 | 0)[][], number>([
-    [
-      [
-        [0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0],
-        [0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0],
-        [0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0],
-        [0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0],
-        [0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0],
-        [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0],
-        [0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0],
-        [0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0]
-      ],
-      6
-    ],
-    [[[1, 1, 0, 0, 0], [1, 1, 0, 0, 0], [0, 0, 0, 1, 1], [0, 0, 0, 1, 1]], 4],
-    [[[0, 0, 0, 0, 0, 0, 0, 0]], 0]
-  ]);
-
-  for (const [grid, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with some ${grid[0].length}x${grid.length} grid`, () => {
-      expect(maxAreaOfIsland(grid)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/maxAreaOfIsland.ts b/solutions/max_area_of_island.ts
similarity index 100%
rename from solutions/maxAreaOfIsland.ts
rename to solutions/max_area_of_island.ts
diff --git a/solutions/max_area_of_island_test.ts b/solutions/max_area_of_island_test.ts
new file mode 100644
index 0000000..e77c43a
--- /dev/null
+++ b/solutions/max_area_of_island_test.ts
@@ -0,0 +1,27 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import maxAreaOfIsland from "./max_area_of_island.ts";
+
+test("695. Max Area of Island", () => {
+  assert(
+    maxAreaOfIsland([
+      [0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0],
+      [0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0],
+      [0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0],
+      [0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0],
+      [0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0],
+      [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0],
+      [0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0],
+      [0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0]
+    ]) === 6
+  );
+  assert(
+    maxAreaOfIsland([
+      [1, 1, 0, 0, 0],
+      [1, 1, 0, 0, 0],
+      [0, 0, 0, 1, 1],
+      [0, 0, 0, 1, 1]
+    ]) === 4
+  );
+  assert(maxAreaOfIsland([[0, 0, 0, 0, 0, 0, 0, 0]]) === 0);
+});
diff --git a/solutions/maximumDepthOfBinaryTree.test.ts b/solutions/maximumDepthOfBinaryTree.test.ts
deleted file mode 100644
index 350b76d..0000000
--- a/solutions/maximumDepthOfBinaryTree.test.ts
+++ /dev/null
@@ -1,12 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import maxDepth from "./maximumDepthOfBinaryTree";
-
-describe("104. Maximum Depth of Binary Tree", () => {
-  const TEST_CASES = new Map([[[3, 9, 20, null, null, 15, 7], 3], [[], 0]]);
-
-  for (const [values, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}]`, () => {
-      expect(maxDepth(createBinaryTreeNode(values))).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/maximumLengthOfPairChain.test.ts b/solutions/maximumLengthOfPairChain.test.ts
deleted file mode 100644
index e74a566..0000000
--- a/solutions/maximumLengthOfPairChain.test.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import findLongestChain from "./maximumLengthOfPairChain";
-
-describe("646. Maximum Length of Pair Chain", () => {
-  const TEST_CASES = new Map<[number, number][], number>([
-    [[[1, 2], [2, 3], [3, 4]], 2],
-    [[[3, 4], [2, 3], [1, 2]], 2],
-    [[[1, 2]], 1]
-  ]);
-
-  for (const [pairs, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${pairs}]`, () => {
-      expect(findLongestChain(pairs)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/maximumSubarray.test.ts b/solutions/maximumSubarray.test.ts
deleted file mode 100644
index 157ec74..0000000
--- a/solutions/maximumSubarray.test.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import maxSubArray from "./maximumSubarray";
-
-describe("53. Maximum Subarray", () => {
-  const TEST_CASES = new Map([
-    [[-2, 1, -3, 4, -1, 2, 1, -5, 4], 6],
-    [[-3, -2, -5, -1, -4, -1], -1]
-  ]);
-
-  for (const [nums, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${nums}]`, () => {
-      expect(maxSubArray(nums)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/maximumDepthOfBinaryTree.ts b/solutions/maximum_depth_of_binary_tree.ts
similarity index 82%
rename from solutions/maximumDepthOfBinaryTree.ts
rename to solutions/maximum_depth_of_binary_tree.ts
index bb1ace3..fdeedca 100644
--- a/solutions/maximumDepthOfBinaryTree.ts
+++ b/solutions/maximum_depth_of_binary_tree.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 104. Maximum Depth of Binary Tree
 // https://leetcode.com/problems/maximum-depth-of-binary-tree/
diff --git a/solutions/maximum_depth_of_binary_tree_test.ts b/solutions/maximum_depth_of_binary_tree_test.ts
new file mode 100644
index 0000000..c364732
--- /dev/null
+++ b/solutions/maximum_depth_of_binary_tree_test.ts
@@ -0,0 +1,9 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import maxDepth from "./maximum_depth_of_binary_tree.ts";
+
+test("104. Maximum Depth of Binary Tree", () => {
+  assert(maxDepth(createBinaryTreeNode([3, 9, 20, null, null, 15, 7])) === 3);
+  assert(maxDepth(createBinaryTreeNode([])) === 0);
+});
diff --git a/solutions/maximumLengthOfPairChain.ts b/solutions/maximum_length_of_pair_chain.ts
similarity index 100%
rename from solutions/maximumLengthOfPairChain.ts
rename to solutions/maximum_length_of_pair_chain.ts
diff --git a/solutions/maximum_length_of_pair_chain_test.ts b/solutions/maximum_length_of_pair_chain_test.ts
new file mode 100644
index 0000000..43f7e5d
--- /dev/null
+++ b/solutions/maximum_length_of_pair_chain_test.ts
@@ -0,0 +1,9 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import findLongestChain from "./maximum_length_of_pair_chain.ts";
+
+test("646. Maximum Length of Pair Chain", () => {
+  assert(findLongestChain([[1, 2], [2, 3], [3, 4]]) === 2);
+  assert(findLongestChain([[3, 4], [2, 3], [1, 2]]) === 2);
+  assert(findLongestChain([[1, 2]]) === 1);
+});
diff --git a/solutions/maximumSubarray.ts b/solutions/maximum_subarray.ts
similarity index 79%
rename from solutions/maximumSubarray.ts
rename to solutions/maximum_subarray.ts
index 0e4f4a1..aac83c3 100644
--- a/solutions/maximumSubarray.ts
+++ b/solutions/maximum_subarray.ts
@@ -1,6 +1,6 @@
 // 53. Maximum Subarray
 // https://leetcode.com/problems/maximum-subarray/
-function maxSubArray(nums: number[]): number {
+export default function maxSubArray(nums: number[]): number {
   let current = nums[0];
   let max = current;
 
@@ -14,5 +14,3 @@ function maxSubArray(nums: number[]): number {
 
   return max;
 }
-
-export default maxSubArray;
diff --git a/solutions/maximum_subarray_test.ts b/solutions/maximum_subarray_test.ts
new file mode 100644
index 0000000..a850fcc
--- /dev/null
+++ b/solutions/maximum_subarray_test.ts
@@ -0,0 +1,8 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import maxSubArray from "./maximum_subarray.ts";
+
+test("53. Maximum Subarray", () => {
+  assert(maxSubArray([-2, 1, -3, 4, -1, 2, 1, -5, 4]) === 6);
+  assert(maxSubArray([-3, -2, -5, -1, -4, -1]) === -1);
+});
diff --git a/solutions/mergeSortedArray.test.ts b/solutions/mergeSortedArray.test.ts
deleted file mode 100644
index 6cca81a..0000000
--- a/solutions/mergeSortedArray.test.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import merge from "./mergeSortedArray";
-
-describe("88. Merge Sorted Array", () => {
-  const TEST_CASES = new Map<[number[], number, number[], number], number[]>([
-    [[[1, 2, 3, 0, 0, 0], 3, [2, 5, 6], 3], [1, 2, 2, 3, 5, 6]],
-    [[[1, 2, 5, 0, 0, 0], 3, [3, 4, 6], 3], [1, 2, 3, 4, 5, 6]],
-    [[[1, 2, 5, 0, 0, 0], 3, [3], 1], [1, 2, 3, 5]],
-    [[[4, 0, 0, 0], 1, [1, 2, 3], 3], [1, 2, 3, 4]],
-    [[[0, 0, 0], 0, [1, 2, 3], 3], [1, 2, 3]],
-    [[[1, 2, 3], 3, [], 0], [1, 2, 3]],
-    [[[], 0, [], 0], []]
-  ]);
-
-  for (const [[nums1, m, nums2, n], expected] of TEST_CASES) {
-    it(`merges in-placely [${nums2}] (length=${n}) into [${nums1}] (length=${m})`, () => {
-      const nums = [...nums1];
-      const result = merge(nums, m, nums2, n);
-
-      expect(result).toEqual(expected);
-      expect(result).toBe(nums);
-    });
-  }
-});
diff --git a/solutions/mergeTwoLists.test.ts b/solutions/mergeTwoLists.test.ts
deleted file mode 100644
index 6ba0818..0000000
--- a/solutions/mergeTwoLists.test.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-import { createSinglyLinkedListNode } from "../testUtilities/LinkedList";
-import mergeTwoLists from "./mergeTwoLists";
-
-describe("21. Merge Two Sorted Lists", () => {
-  const TEST_CASES = new Map([
-    [[[1, 2, 4], [1, 3, 4]], [1, 1, 2, 3, 4, 4]],
-    [[[], []], []]
-  ]);
-
-  for (const [[list1, list2], expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${list1}] and [${list2}]`, () => {
-      expect(
-        mergeTwoLists(
-          createSinglyLinkedListNode(list1),
-          createSinglyLinkedListNode(list2)
-        )
-      ).toEqual(createSinglyLinkedListNode(expected));
-    });
-  }
-});
diff --git a/solutions/mergeSortedArray.ts b/solutions/merge_sorted_array.ts
similarity index 94%
rename from solutions/mergeSortedArray.ts
rename to solutions/merge_sorted_array.ts
index cade26a..3d3bf8b 100644
--- a/solutions/mergeSortedArray.ts
+++ b/solutions/merge_sorted_array.ts
@@ -1,6 +1,6 @@
 // 88. Merge Sorted Array
 // https://leetcode.com/problems/merge-sorted-array/
-function merge(
+export default function merge(
   nums1: number[],
   m: number,
   nums2: number[],
@@ -28,5 +28,3 @@ function merge(
 
   return nums1;
 }
-
-export default merge;
diff --git a/solutions/merge_sorted_array_test.ts b/solutions/merge_sorted_array_test.ts
new file mode 100644
index 0000000..92f2500
--- /dev/null
+++ b/solutions/merge_sorted_array_test.ts
@@ -0,0 +1,13 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import merge from "./merge_sorted_array.ts";
+
+test("88. Merge Sorted Array", () => {
+  assertEquals(merge([1, 2, 3, 0, 0, 0], 3, [2, 5, 6], 3), [1, 2, 2, 3, 5, 6]);
+  assertEquals(merge([1, 2, 5, 0, 0, 0], 3, [3, 4, 6], 3), [1, 2, 3, 4, 5, 6]);
+  assertEquals(merge([1, 2, 5, 0, 0, 0], 3, [3], 1), [1, 2, 3, 5]);
+  assertEquals(merge([4, 0, 0, 0], 1, [1, 2, 3], 3), [1, 2, 3, 4]);
+  assertEquals(merge([0, 0, 0], 0, [1, 2, 3], 3), [1, 2, 3]);
+  assertEquals(merge([1, 2, 3], 3, [], 0), [1, 2, 3]);
+  assertEquals(merge([], 0, [], 0), []);
+});
diff --git a/solutions/mergeTwoLists.ts b/solutions/merge_two_lists.ts
similarity index 79%
rename from solutions/mergeTwoLists.ts
rename to solutions/merge_two_lists.ts
index dfee38a..ce76d30 100644
--- a/solutions/mergeTwoLists.ts
+++ b/solutions/merge_two_lists.ts
@@ -1,8 +1,8 @@
-import { SinglyLinkedListNode } from "../types/LinkedList";
+import { SinglyLinkedListNode } from "../types/linked_list.ts";
 
 // 21. Merge Two Sorted Lists
 // https://leetcode.com/problems/merge-two-sorted-lists/
-function mergeTwoLists<T>(
+export default function mergeTwoLists<T>(
   list1: SinglyLinkedListNode<T> | null,
   list2: SinglyLinkedListNode<T> | null
 ): SinglyLinkedListNode<T> | null {
@@ -24,5 +24,3 @@ function mergeTwoLists<T>(
 
   return list2;
 }
-
-export default mergeTwoLists;
diff --git a/solutions/merge_two_lists_test.ts b/solutions/merge_two_lists_test.ts
new file mode 100644
index 0000000..63ffe39
--- /dev/null
+++ b/solutions/merge_two_lists_test.ts
@@ -0,0 +1,21 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import { createSinglyLinkedListNode } from "../test_utilities/linked_list.ts";
+import mergeTwoLists from "./merge_two_lists.ts";
+
+test("21. Merge Two Sorted Lists", () => {
+  assertEquals(
+    mergeTwoLists(
+      createSinglyLinkedListNode([1, 2, 4]),
+      createSinglyLinkedListNode([1, 3, 4])
+    ),
+    createSinglyLinkedListNode([1, 1, 2, 3, 4, 4])
+  );
+  assertEquals(
+    mergeTwoLists(
+      createSinglyLinkedListNode([]),
+      createSinglyLinkedListNode([])
+    ),
+    createSinglyLinkedListNode([])
+  );
+});
diff --git a/solutions/minCostClimbingStairs.test.ts b/solutions/minCostClimbingStairs.test.ts
deleted file mode 100644
index eecc0a6..0000000
--- a/solutions/minCostClimbingStairs.test.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import minCostClimbingStairs from "./minCostClimbingStairs";
-
-describe("746. Min Cost Climbing Stairs", () => {
-  const TEST_CASES = new Map([
-    [[10, 15, 20], 15],
-    [[1, 100, 1, 1, 1, 100, 1, 1, 100, 1], 6]
-  ]);
-
-  for (const [costs, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${costs}]`, () => {
-      expect(minCostClimbingStairs(costs)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/minStack.test.ts b/solutions/minStack.test.ts
deleted file mode 100644
index 7981384..0000000
--- a/solutions/minStack.test.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import MinStack from "./minStack";
-
-describe("155. Min Stack", () => {
-  test("#1", () => {
-    const minStack = new MinStack();
-    minStack.push(-2);
-    minStack.push(0);
-    minStack.push(-3);
-    expect(minStack.getMin()).toBe(-3);
-    minStack.pop();
-    expect(minStack.top()).toBe(0);
-    expect(minStack.getMin()).toBe(-2);
-  });
-});
diff --git a/solutions/minCostClimbingStairs.ts b/solutions/min_cost_climbing_stairs.ts
similarity index 80%
rename from solutions/minCostClimbingStairs.ts
rename to solutions/min_cost_climbing_stairs.ts
index 2f3bd68..d3f3602 100644
--- a/solutions/minCostClimbingStairs.ts
+++ b/solutions/min_cost_climbing_stairs.ts
@@ -1,6 +1,6 @@
 // 746. Min Cost Climbing Stairs
 // https://leetcode.com/problems/min-cost-climbing-stairs/
-function minCostClimbingStairs(costs: number[]): number {
+export default function minCostClimbingStairs(costs: number[]): number {
   // this is dynamic programming.
   // see https://github.com/axross/leetcode-typescript/pull/58
   const dp = new Map([[-2, 0], [-1, 0]]);
@@ -11,5 +11,3 @@ function minCostClimbingStairs(costs: number[]): number {
 
   return dp.get(costs.length)!;
 }
-
-export default minCostClimbingStairs;
diff --git a/solutions/min_cost_climbing_stairs_test.ts b/solutions/min_cost_climbing_stairs_test.ts
new file mode 100644
index 0000000..1186bca
--- /dev/null
+++ b/solutions/min_cost_climbing_stairs_test.ts
@@ -0,0 +1,8 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import minCostClimbingStairs from "./min_cost_climbing_stairs.ts";
+
+test("746. Min Cost Climbing Stairs", () => {
+  assert(minCostClimbingStairs([10, 15, 20]) === 15);
+  assert(minCostClimbingStairs([1, 100, 1, 1, 1, 100, 1, 1, 100, 1]) === 6);
+});
diff --git a/solutions/minStack.ts b/solutions/min_stack.ts
similarity index 94%
rename from solutions/minStack.ts
rename to solutions/min_stack.ts
index 2c6e637..fbeb647 100644
--- a/solutions/minStack.ts
+++ b/solutions/min_stack.ts
@@ -1,6 +1,6 @@
 // 155. Min Stack
 // https://leetcode.com/problems/min-stack/
-class MinStack {
+export default class MinStack {
   stack: number[] = [];
   stackInOrder: number[] = [];
 
@@ -31,5 +31,3 @@ class MinStack {
     return this.stackInOrder[this.stackInOrder.length - 1];
   }
 }
-
-export default MinStack;
diff --git a/solutions/min_stack_test.ts b/solutions/min_stack_test.ts
new file mode 100644
index 0000000..56669f1
--- /dev/null
+++ b/solutions/min_stack_test.ts
@@ -0,0 +1,14 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import MinStack from "./min_stack.ts";
+
+test("155. Min Stack", () => {
+  const minStack = new MinStack();
+  minStack.push(-2);
+  minStack.push(0);
+  minStack.push(-3);
+  assert(minStack.getMin() === -3);
+  minStack.pop();
+  assert(minStack.top() === 0);
+  assert(minStack.getMin() === -2);
+});
diff --git a/solutions/minimumDepthOfBinaryTree.test.ts b/solutions/minimumDepthOfBinaryTree.test.ts
deleted file mode 100644
index 15d0904..0000000
--- a/solutions/minimumDepthOfBinaryTree.test.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import minDepth from "./minimumDepthOfBinaryTree";
-
-describe("111. Minimum Depth of Binary Tree", () => {
-  const TEST_CASES = new Map([
-    [[3, 9, 20, null, null, 15, 7], 2],
-    [[1, 2], 2],
-    [[1, null, 2, null, 2], 3],
-    [[1], 1],
-    [[], 0]
-  ]);
-
-  for (const [values, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}]`, () => {
-      expect(minDepth(createBinaryTreeNode(values))).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/minimumDepthOfBinaryTree.ts b/solutions/minimum_depth_of_binary_tree.ts
similarity index 89%
rename from solutions/minimumDepthOfBinaryTree.ts
rename to solutions/minimum_depth_of_binary_tree.ts
index 86d41a3..147aafd 100644
--- a/solutions/minimumDepthOfBinaryTree.ts
+++ b/solutions/minimum_depth_of_binary_tree.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 111. Minimum Depth of Binary Tree
 // https://leetcode.com/problems/minimum-depth-of-binary-tree/
diff --git a/solutions/minimum_depth_of_binary_tree_test.ts b/solutions/minimum_depth_of_binary_tree_test.ts
new file mode 100644
index 0000000..6b10ad6
--- /dev/null
+++ b/solutions/minimum_depth_of_binary_tree_test.ts
@@ -0,0 +1,12 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import minDepth from "./minimum_depth_of_binary_tree.ts";
+
+test("111. Minimum Depth of Binary Tree", () => {
+  assert(minDepth(createBinaryTreeNode([3, 9, 20, null, null, 15, 7])) === 2);
+  assert(minDepth(createBinaryTreeNode([1, 2])) === 2);
+  assert(minDepth(createBinaryTreeNode([1, null, 2, null, 2])) === 3);
+  assert(minDepth(createBinaryTreeNode([1])) === 1);
+  assert(minDepth(createBinaryTreeNode([])) === 0);
+});
diff --git a/solutions/mostCommonWord.test.ts b/solutions/mostCommonWord.test.ts
deleted file mode 100644
index e837136..0000000
--- a/solutions/mostCommonWord.test.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import mostCommonWord from "./mostCommonWord";
-
-describe("819. Most Common Word", () => {
-  const TEST_CASES = new Map<[string, string[]], string>([
-    [
-      ["Bob hit a ball, the hit BALL flew far after it was hit.", ["hit"]],
-      "ball"
-    ],
-    [["Bob hit a ball, the hit BALL flew far after it was hit.", []], "hit"],
-    [["Bob", []], "bob"],
-    [["a, a, a, a, b,b,b,c, c", ["a"]], "b"]
-  ]);
-
-  for (const [[paragraph, banned], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${paragraph} with [${banned}]`, () => {
-      expect(mostCommonWord(paragraph, banned)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/mostCommonWord.ts b/solutions/most_common_word.ts
similarity index 87%
rename from solutions/mostCommonWord.ts
rename to solutions/most_common_word.ts
index 2d5f2a1..b4ebc7b 100644
--- a/solutions/mostCommonWord.ts
+++ b/solutions/most_common_word.ts
@@ -1,6 +1,9 @@
 // 819. Most Common Word
 // https://leetcode.com/problems/most-common-word/
-function mostCommonWord(paragraph: string, banned: string[]): string {
+export default function mostCommonWord(
+  paragraph: string,
+  banned: string[]
+): string {
   const lowercase = paragraph.toLowerCase();
   // split lowercase paragpraph into words (by non a-z characters)
   const words = lowercase.split(/[^a-z]+/);
@@ -24,5 +27,3 @@ function mostCommonWord(paragraph: string, banned: string[]): string {
 
   return mostFrequentWord;
 }
-
-export default mostCommonWord;
diff --git a/solutions/most_common_word_test.ts b/solutions/most_common_word_test.ts
new file mode 100644
index 0000000..3ee7260
--- /dev/null
+++ b/solutions/most_common_word_test.ts
@@ -0,0 +1,19 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import mostCommonWord from "./most_common_word.ts";
+
+test("819. Most Common Word", () => {
+  assert(
+    mostCommonWord("Bob hit a ball, the hit BALL flew far after it was hit.", [
+      "hit"
+    ]) === "ball"
+  );
+  assert(
+    mostCommonWord(
+      "Bob hit a ball, the hit BALL flew far after it was hit.",
+      []
+    ) === "hit"
+  );
+  assert(mostCommonWord("Bob", []) === "bob");
+  assert(mostCommonWord("a, a, a, a, b,b,b,c, c", ["a"]) === "b");
+});
diff --git a/solutions/moveZeroes.test.ts b/solutions/moveZeroes.test.ts
deleted file mode 100644
index ff32efe..0000000
--- a/solutions/moveZeroes.test.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import moveZeroes from "./moveZeroes";
-
-describe("283. Move Zeroes", () => {
-  const TEST_CASES = new Map([[[0, 1, 0, 3, 12], [1, 3, 12, 0, 0]]]);
-
-  for (const [nums, expected] of TEST_CASES) {
-    it(`moves zeroes to the tail for [${nums}] to be [${expected}]`, () => {
-      const array = [...nums];
-
-      moveZeroes(array);
-
-      expect(array).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/moveZeroes.ts b/solutions/move_zeroes.ts
similarity index 86%
rename from solutions/moveZeroes.ts
rename to solutions/move_zeroes.ts
index d8d5ac8..19dd866 100644
--- a/solutions/moveZeroes.ts
+++ b/solutions/move_zeroes.ts
@@ -1,6 +1,6 @@
 // 283. Move Zeroes
 // https://leetcode.com/problems/move-zeroes/
-function moveZeroes(nums: number[]): void {
+export default function moveZeroes(nums: number[]): void {
   let deleted = 0;
   let i = 0;
 
@@ -24,5 +24,3 @@ function moveZeroes(nums: number[]): void {
     nums.push(0);
   }
 }
-
-export default moveZeroes;
diff --git a/solutions/move_zeroes_test.ts b/solutions/move_zeroes_test.ts
new file mode 100644
index 0000000..c930238
--- /dev/null
+++ b/solutions/move_zeroes_test.ts
@@ -0,0 +1,11 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import moveZeroes from "./move_zeroes.ts";
+
+test("283. Move Zeroes", () => {
+  const values = [0, 1, 0, 3, 12];
+
+  moveZeroes(values);
+
+  assertEquals(values, [1, 3, 12, 0, 0]);
+});
diff --git a/solutions/paintHouse.test.ts b/solutions/paintHouse.test.ts
deleted file mode 100644
index 6b345b4..0000000
--- a/solutions/paintHouse.test.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import minCost from "./paintHouse";
-
-describe("256. Paint House", () => {
-  const TEST_CASES = new Map<[number, number, number][], number>([
-    [[[17, 2, 17], [16, 16, 5], [14, 3, 19]], 10],
-    [[[17, 2, 17], [16, 16, 5], [30, 3, 19], [4, 8, 2], [10, 15, 11]], 22],
-    [[[5, 8, 6], [19, 14, 13], [7, 5, 12], [14, 15, 17], [3, 20, 10]], 43],
-    [[[5, 8, 6], [19, 14, 13], [7, 5, 12], [14, 15, 20], [3, 20, 10]], 43]
-  ]);
-
-  for (const [houses, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${houses.map(
-      house => `[${house}]`
-    )}]`, () => {
-      expect(minCost(houses)).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/paintHouse.ts b/solutions/paint_house.ts
similarity index 89%
rename from solutions/paintHouse.ts
rename to solutions/paint_house.ts
index c779077..70795b0 100644
--- a/solutions/paintHouse.ts
+++ b/solutions/paint_house.ts
@@ -1,6 +1,6 @@
 // 256. Paint House
 // https://leetcode.com/problems/paint-house/
-function minCost(costs: [number, number, number][]): number {
+export default function minCost(costs: [number, number, number][]): number {
   // this is dynamic programming.
   // see https://github.com/axross/leetcode-typescript/pull/56
   const dp = new Map<number, [number, number, number]>([[-1, [0, 0, 0]]]);
@@ -18,5 +18,3 @@ function minCost(costs: [number, number, number][]): number {
   // the minimum value in the end is the minimum cost
   return Math.min(...dp.get(costs.length - 1)!);
 }
-
-export default minCost;
diff --git a/solutions/paint_house_test.ts b/solutions/paint_house_test.ts
new file mode 100644
index 0000000..d91bdb5
--- /dev/null
+++ b/solutions/paint_house_test.ts
@@ -0,0 +1,34 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import minCost from "./paint_house.ts";
+
+test("256. Paint House", () => {
+  assert(minCost([[17, 2, 17], [16, 16, 5], [14, 3, 19]]) === 10);
+  assert(
+    minCost([
+      [17, 2, 17],
+      [16, 16, 5],
+      [30, 3, 19],
+      [4, 8, 2],
+      [10, 15, 11]
+    ]) === 22
+  );
+  assert(
+    minCost([
+      [5, 8, 6],
+      [19, 14, 13],
+      [7, 5, 12],
+      [14, 15, 17],
+      [3, 20, 10]
+    ]) === 43
+  );
+  assert(
+    minCost([
+      [5, 8, 6],
+      [19, 14, 13],
+      [7, 5, 12],
+      [14, 15, 20],
+      [3, 20, 10]
+    ]) === 43
+  );
+});
diff --git a/solutions/palidromeNumber.test.ts b/solutions/palidromeNumber.test.ts
deleted file mode 100644
index e9ccf59..0000000
--- a/solutions/palidromeNumber.test.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import isPalindrome from "./palidromeNumber";
-
-describe("9. Palindrome Number", () => {
-  const TEST_CASES = new Map([
-    [121, true],
-    [-121, false],
-    [5, true],
-    [0, true],
-    [10, false],
-    [101, true],
-    [1010, false]
-  ]);
-
-  for (const [number, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${number}`, () => {
-      expect(isPalindrome(number)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/palidromeNumber.ts b/solutions/palidrome_number.ts
similarity index 87%
rename from solutions/palidromeNumber.ts
rename to solutions/palidrome_number.ts
index 118ba4e..f86110e 100644
--- a/solutions/palidromeNumber.ts
+++ b/solutions/palidrome_number.ts
@@ -1,6 +1,6 @@
 // 9. Palindrome Number
 // https://leetcode.com/problems/palindrome-number/
-function isPalindrome(x: number): boolean {
+export default function isPalindrome(x: number): boolean {
   if (x >= 0 && x <= 9) return true;
   if (x < 0) return false;
 
@@ -22,5 +22,3 @@ function isPalindrome(x: number): boolean {
 
   return true;
 }
-
-export default isPalindrome;
diff --git a/solutions/palidrome_number_test.ts b/solutions/palidrome_number_test.ts
new file mode 100644
index 0000000..c0859af
--- /dev/null
+++ b/solutions/palidrome_number_test.ts
@@ -0,0 +1,13 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import isPalindrome from "./palidrome_number.ts";
+
+test("9. Palindrome Number", () => {
+  assert(isPalindrome(121) === true);
+  assert(isPalindrome(-121) === false);
+  assert(isPalindrome(5) === true);
+  assert(isPalindrome(0) === true);
+  assert(isPalindrome(10) === false);
+  assert(isPalindrome(101) === true);
+  assert(isPalindrome(1010) === false);
+});
diff --git a/solutions/palindromeLinkedList.test.ts b/solutions/palindromeLinkedList.test.ts
deleted file mode 100644
index a13a896..0000000
--- a/solutions/palindromeLinkedList.test.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import { createSinglyLinkedListNode } from "../testUtilities/LinkedList";
-import isPalindrome from "./palindromeLinkedList";
-
-describe("234. Palindrome Linked List", () => {
-  const TEST_CASES = new Map([
-    [[1, 2], false],
-    [[1, 2, 2, 1], true],
-    [[1, 2, 1, 3, 1, 2, 1], true],
-    [[1, 2, 1, 3, 1, 3, 1], false]
-  ]);
-
-  for (const [values, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}]`, () => {
-      expect(isPalindrome(createSinglyLinkedListNode(values))).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/palindromeLinkedList.ts b/solutions/palindrome_linked_list.ts
similarity index 90%
rename from solutions/palindromeLinkedList.ts
rename to solutions/palindrome_linked_list.ts
index d1e689a..fb62ed7 100644
--- a/solutions/palindromeLinkedList.ts
+++ b/solutions/palindrome_linked_list.ts
@@ -1,4 +1,4 @@
-import { SinglyLinkedListNode } from "../types/LinkedList";
+import { SinglyLinkedListNode } from "../types/linked_list.ts";
 
 // 234. Palindrome Linked List
 // https://leetcode.com/problems/palindrome-linked-list/
diff --git a/solutions/palindrome_linked_list_test.ts b/solutions/palindrome_linked_list_test.ts
new file mode 100644
index 0000000..6320fa5
--- /dev/null
+++ b/solutions/palindrome_linked_list_test.ts
@@ -0,0 +1,15 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import { createSinglyLinkedListNode } from "../test_utilities/linked_list.ts";
+import isPalindrome from "./palindrome_linked_list.ts";
+
+test("234. Palindrome Linked List", () => {
+  assert(isPalindrome(createSinglyLinkedListNode([1, 2])) === false);
+  assert(isPalindrome(createSinglyLinkedListNode([1, 2, 2, 1])) === true);
+  assert(
+    isPalindrome(createSinglyLinkedListNode([1, 2, 1, 3, 1, 2, 1])) === true
+  );
+  assert(
+    isPalindrome(createSinglyLinkedListNode([1, 2, 1, 3, 1, 3, 1])) === false
+  );
+});
diff --git a/solutions/partitionEqualSubsetSum.test.ts b/solutions/partitionEqualSubsetSum.test.ts
deleted file mode 100644
index e633560..0000000
--- a/solutions/partitionEqualSubsetSum.test.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import canPartition from "./partitionEqualSubsetSum";
-
-describe("416. Partition Equal Subset Sum", () => {
-  const TEST_CASES = new Map([
-    [[1, 5, 11, 5], true],
-    [[1, 2, 3, 5], false],
-    [[8, 6, 3, 4, 5], true]
-  ]);
-
-  for (const [nums, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${nums}]`, () => {
-      expect(canPartition(nums)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/partitionEqualSubsetSum.ts b/solutions/partition_equal_subset_sum.ts
similarity index 85%
rename from solutions/partitionEqualSubsetSum.ts
rename to solutions/partition_equal_subset_sum.ts
index 2002de1..598e2f3 100644
--- a/solutions/partitionEqualSubsetSum.ts
+++ b/solutions/partition_equal_subset_sum.ts
@@ -1,6 +1,6 @@
 // 416. Partition Equal Subset Sum
 // https://leetcode.com/problems/partition-equal-subset-sum/
-function canPartition(nums: number[]): boolean {
+export default function canPartition(nums: number[]): boolean {
   const total = nums.reduce((total, num) => total + num, 0);
 
   if (total % 2 !== 0) return false;
@@ -20,5 +20,3 @@ function canPartition(nums: number[]): boolean {
 
   return false;
 }
-
-export default canPartition;
diff --git a/solutions/partition_equal_subset_sum_test.ts b/solutions/partition_equal_subset_sum_test.ts
new file mode 100644
index 0000000..d7b8446
--- /dev/null
+++ b/solutions/partition_equal_subset_sum_test.ts
@@ -0,0 +1,9 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import canPartition from "./partition_equal_subset_sum.ts";
+
+test("416. Partition Equal Subset Sum", () => {
+  assert(canPartition([1, 5, 11, 5]) === true);
+  assert(canPartition([1, 2, 3, 5]) === false);
+  assert(canPartition([8, 6, 3, 4, 5]) === true);
+});
diff --git a/solutions/pathSum.test.ts b/solutions/pathSum.test.ts
deleted file mode 100644
index 4a6142d..0000000
--- a/solutions/pathSum.test.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import pathSum from "./pathSum";
-
-describe("112. Path Sum", () => {
-  const TEST_CASES = new Map<[(number | null)[], number], boolean>([
-    [[[5, 4, 8, 11, null, 13, 4, 7, 2, null, null, null, 1], 22], true],
-    [[[5, 4, 8, 11, null, 13, 4, 7, 2, null, null, null, 1], 20], false],
-    [[[], 0], false]
-  ]);
-
-  for (const [[values, sum], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}] and ${sum}`, () => {
-      expect(pathSum(createBinaryTreeNode(values), sum)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/pathSum.ts b/solutions/path_sum.ts
similarity index 91%
rename from solutions/pathSum.ts
rename to solutions/path_sum.ts
index e6877da..87cef5a 100644
--- a/solutions/pathSum.ts
+++ b/solutions/path_sum.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 112. Path Sum
 // https://leetcode.com/problems/path-sum/
diff --git a/solutions/path_sum_test.ts b/solutions/path_sum_test.ts
new file mode 100644
index 0000000..bc7236b
--- /dev/null
+++ b/solutions/path_sum_test.ts
@@ -0,0 +1,48 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import pathSum from "./path_sum.ts";
+
+test("112. Path Sum", () => {
+  assert(
+    pathSum(
+      createBinaryTreeNode([
+        5,
+        4,
+        8,
+        11,
+        null,
+        13,
+        4,
+        7,
+        2,
+        null,
+        null,
+        null,
+        1
+      ]),
+      22
+    ) === true
+  );
+  assert(
+    pathSum(
+      createBinaryTreeNode([
+        5,
+        4,
+        8,
+        11,
+        null,
+        13,
+        4,
+        7,
+        2,
+        null,
+        null,
+        null,
+        1
+      ]),
+      20
+    ) === false
+  );
+  assert(pathSum(createBinaryTreeNode([]), 0) === false);
+});
diff --git a/solutions/perfectNumber.test.ts b/solutions/perfectNumber.test.ts
deleted file mode 100644
index e696d63..0000000
--- a/solutions/perfectNumber.test.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import checkPerfectNumber from "./perfectNumber";
-
-describe("507. Perfect Number", () => {
-  const TEST_CASES = new Map([
-    [28, true],
-    [27, false],
-    [6, true],
-    [1, false],
-    [0, false]
-  ]);
-
-  for (const [nums, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${nums}`, () => {
-      expect(checkPerfectNumber(nums)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/perfectNumber.ts b/solutions/perfect_number.ts
similarity index 100%
rename from solutions/perfectNumber.ts
rename to solutions/perfect_number.ts
diff --git a/solutions/perfect_number_test.ts b/solutions/perfect_number_test.ts
new file mode 100644
index 0000000..faef4dc
--- /dev/null
+++ b/solutions/perfect_number_test.ts
@@ -0,0 +1,11 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import checkPerfectNumber from "./perfect_number.ts";
+
+test("507. Perfect Number", () => {
+  assert(checkPerfectNumber(28) === true);
+  assert(checkPerfectNumber(27) === false);
+  assert(checkPerfectNumber(6) === true);
+  assert(checkPerfectNumber(1) === false);
+  assert(checkPerfectNumber(0) === false);
+});
diff --git a/solutions/plusOne.test.ts b/solutions/plusOne.test.ts
deleted file mode 100644
index 41ab39d..0000000
--- a/solutions/plusOne.test.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-import plusOne from "./plusOne";
-
-describe("66. Plus One", () => {
-  const TEST_CASES = new Map([
-    [[1, 2, 3], [1, 2, 4]],
-    [[1, 2, 9], [1, 3, 0]],
-    [[9, 9, 9], [1, 0, 0, 0]],
-    [
-      [6, 1, 4, 5, 3, 9, 0, 1, 9, 5, 1, 8, 6, 7, 0, 5, 5, 4, 3],
-      [6, 1, 4, 5, 3, 9, 0, 1, 9, 5, 1, 8, 6, 7, 0, 5, 5, 4, 4]
-    ],
-    [[0], [1]],
-    [[9], [1, 0]]
-  ]);
-
-  for (const [digits, expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${digits}]`, () => {
-      expect(plusOne(digits)).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/plusOne.ts b/solutions/plus_one.ts
similarity index 83%
rename from solutions/plusOne.ts
rename to solutions/plus_one.ts
index fe810a3..ad67200 100644
--- a/solutions/plusOne.ts
+++ b/solutions/plus_one.ts
@@ -1,6 +1,6 @@
 // 66. Plus One
 // https://leetcode.com/problems/plus-one/
-function plusOne(digits: number[]): number[] {
+export default function plusOne(digits: number[]): number[] {
   if (digits.length === 1) {
     return digits[0] <= 8 ? [digits[0] + 1] : [1, 0];
   }
@@ -13,5 +13,3 @@ function plusOne(digits: number[]): number[] {
     return [...digits.slice(0, -1), lastDigits[0]];
   }
 }
-
-export default plusOne;
diff --git a/solutions/plus_one_test.ts b/solutions/plus_one_test.ts
new file mode 100644
index 0000000..be9e0da
--- /dev/null
+++ b/solutions/plus_one_test.ts
@@ -0,0 +1,15 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import plusOne from "./plus_one.ts";
+
+test("66. Plus One", () => {
+  assertEquals(plusOne([1, 2, 3]), [1, 2, 4]);
+  assertEquals(plusOne([1, 2, 9]), [1, 3, 0]);
+  assertEquals(plusOne([9, 9, 9]), [1, 0, 0, 0]);
+  assertEquals(
+    plusOne([6, 1, 4, 5, 3, 9, 0, 1, 9, 5, 1, 8, 6, 7, 0, 5, 5, 4, 3]),
+    [6, 1, 4, 5, 3, 9, 0, 1, 9, 5, 1, 8, 6, 7, 0, 5, 5, 4, 4]
+  );
+  assertEquals(plusOne([0]), [1]);
+  assertEquals(plusOne([9]), [1, 0]);
+});
diff --git a/solutions/rangeSumQueryImmutable.test.ts b/solutions/rangeSumQueryImmutable.test.ts
deleted file mode 100644
index c2aa4b6..0000000
--- a/solutions/rangeSumQueryImmutable.test.ts
+++ /dev/null
@@ -1,134 +0,0 @@
-import NumArray from "./rangeSumQueryImmutable";
-
-describe("303. Range Sum Query - Immutable", () => {
-  const TEST_CASES = new Map<[number[], [number, number][]], number[]>([
-    [[[-2, 0, 3, -5, 2, -1], [[0, 2], [2, 5], [0, 5]]], [1, -1, -3]],
-    [
-      [
-        [
-          -8261,
-          2300,
-          -1429,
-          6274,
-          9650,
-          -3267,
-          1414,
-          -8102,
-          6251,
-          -5979,
-          -5291,
-          -4616,
-          -4703
-        ],
-        [
-          [0, 8],
-          [4, 5],
-          [9, 11],
-          [2, 11],
-          [0, 12],
-          [9, 12],
-          [2, 5],
-          [0, 9],
-          [5, 9],
-          [0, 1],
-          [12, 12],
-          [6, 7],
-          [5, 8],
-          [1, 1],
-          [6, 7],
-          [10, 11],
-          [11, 12],
-          [7, 8],
-          [4, 11],
-          [8, 9],
-          [4, 11],
-          [2, 9],
-          [2, 6],
-          [11, 12],
-          [5, 8],
-          [11, 11],
-          [1, 9],
-          [12, 12],
-          [10, 10],
-          [4, 7],
-          [12, 12],
-          [8, 10],
-          [7, 9],
-          [4, 7],
-          [0, 7],
-          [8, 9],
-          [10, 12],
-          [0, 9],
-          [10, 12],
-          [7, 12],
-          [9, 9],
-          [0, 12],
-          [1, 3],
-          [8, 8],
-          [7, 10]
-        ]
-      ],
-      [
-        4830,
-        6383,
-        -15886,
-        -5095,
-        -15759,
-        -20589,
-        11228,
-        -1149,
-        -9683,
-        -5961,
-        -4703,
-        -6688,
-        -3704,
-        2300,
-        -6688,
-        -9907,
-        -9319,
-        -1851,
-        -9940,
-        272,
-        -9940,
-        4812,
-        12642,
-        -9319,
-        -3704,
-        -4616,
-        7112,
-        -4703,
-        -5291,
-        -305,
-        -4703,
-        -5019,
-        -7830,
-        -305,
-        -1421,
-        272,
-        -14610,
-        -1149,
-        -14610,
-        -22440,
-        -5979,
-        -15759,
-        7145,
-        6251,
-        -13121
-      ]
-    ]
-  ]);
-
-  for (const [[initial, ranges], expectedValuesEachRange] of TEST_CASES) {
-    describe(`NumArray([${initial}])`, () => {
-      const numArray = new NumArray(initial);
-
-      for (const i of ranges.keys()) {
-        it(`.sumRange(${ranges[i][0]}, ${ranges[i][1]}) returns ${expectedValuesEachRange[i]}`, () => {
-          expect(numArray.sumRange(ranges[i][0], ranges[i][1])).toBe(
-            expectedValuesEachRange[i]
-          );
-        });
-      }
-    });
-  }
-});
diff --git a/solutions/rangeSumQueryImmutable.ts b/solutions/range_sum_query_immutable.ts
similarity index 91%
rename from solutions/rangeSumQueryImmutable.ts
rename to solutions/range_sum_query_immutable.ts
index 1a0ae1b..ea506a0 100644
--- a/solutions/rangeSumQueryImmutable.ts
+++ b/solutions/range_sum_query_immutable.ts
@@ -1,6 +1,6 @@
 // 303. Range Sum Query - Immutable
 // https://leetcode.com/problems/range-sum-query-immutable/
-class NumArray {
+export default class NumArray {
   constructor(nums: number[]) {
     let total = 0;
 
@@ -19,5 +19,3 @@ class NumArray {
     return this.sums[j] - (this.sums[i - 1] || 0);
   }
 }
-
-export default NumArray;
diff --git a/solutions/range_sum_query_immutable_test.ts b/solutions/range_sum_query_immutable_test.ts
new file mode 100644
index 0000000..6fabd6b
--- /dev/null
+++ b/solutions/range_sum_query_immutable_test.ts
@@ -0,0 +1,774 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import NumArray from "./range_sum_query_immutable.ts";
+
+test("303. Range Sum Query - Immutable", () => {
+  assert(new NumArray([-2, 0, 3, -5, 2, -1]).sumRange(0, 2) === 1);
+  assert(new NumArray([-2, 0, 3, -5, 2, -1]).sumRange(2, 5) === -1);
+  assert(new NumArray([-2, 0, 3, -5, 2, -1]).sumRange(0, 5) === -3);
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(0, 8) === 4830
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(4, 5) === 6383
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(9, 11) === -15886
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(2, 11) === -5095
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(0, 12) === -15759
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(9, 12) === -20589
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(2, 5) === 11228
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(0, 9) === -1149
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(5, 9) === -9683
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(0, 1) === -5961
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(12, 12) === -4703
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(6, 7) === -6688
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(5, 8) === -3704
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(1, 1) === 2300
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(6, 7) === -6688
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(10, 11) === -9907
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(11, 12) === -9319
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(7, 8) === -1851
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(4, 11) === -9940
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(8, 9) === 272
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(4, 11) === -9940
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(2, 9) === 4812
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(2, 6) === 12642
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(11, 12) === -9319
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(5, 8) === -3704
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(11, 11) === -4616
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(1, 9) === 7112
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(12, 12) === -4703
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(10, 10) === -5291
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(4, 7) === -305
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(12, 12) === -4703
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(8, 10) === -5019
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(7, 9) === -7830
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(4, 7) === -305
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(0, 7) === -1421
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(8, 9) === 272
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(10, 12) === -14610
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(0, 9) === -1149
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(10, 12) === -14610
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(7, 12) === -22440
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(9, 9) === -5979
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(0, 12) === -15759
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(1, 3) === 7145
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(8, 8) === 6251
+  );
+  assert(
+    new NumArray([
+      -8261,
+      2300,
+      -1429,
+      6274,
+      9650,
+      -3267,
+      1414,
+      -8102,
+      6251,
+      -5979,
+      -5291,
+      -4616,
+      -4703
+    ]).sumRange(7, 10) === -13121
+  );
+});
diff --git a/solutions/removeDuplicatesFromSortedArray.test.ts b/solutions/removeDuplicatesFromSortedArray.test.ts
deleted file mode 100644
index a37bb31..0000000
--- a/solutions/removeDuplicatesFromSortedArray.test.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import removeDuplicates from "./removeDuplicatesFromSortedArray";
-
-describe("26. Remove Duplicates from Sorted Array", () => {
-  const TEST_CASES = new Map([
-    [[1, 1, 2], [2, [1, 2]]],
-    [[0, 0, 1, 1, 1, 2, 2, 3, 3, 4], [5, [0, 1, 2, 3, 4]]],
-    [[], [0, []]]
-  ]);
-
-  for (const [nums, [expected, expectedRemoved]] of TEST_CASES) {
-    it(`returns ${expected} (to be [${expectedRemoved}]) when called with [${nums}]`, () => {
-      const newLength = removeDuplicates(nums);
-
-      expect(newLength).toBe(expected);
-      expect(nums.slice(0, newLength)).toEqual(expectedRemoved);
-    });
-  }
-});
diff --git a/solutions/removeDuplicatesFromSortedArray.ts b/solutions/remove_duplicates_from_sorted_array.ts
similarity index 85%
rename from solutions/removeDuplicatesFromSortedArray.ts
rename to solutions/remove_duplicates_from_sorted_array.ts
index ed19c2a..78af921 100644
--- a/solutions/removeDuplicatesFromSortedArray.ts
+++ b/solutions/remove_duplicates_from_sorted_array.ts
@@ -1,6 +1,6 @@
 // 26. Remove Duplicates from Sorted Array
 // https://leetcode.com/problems/remove-duplicates-from-sorted-array/
-function removeDuplicates(nums: number[]): number {
+export default function removeDuplicates(nums: number[]): number {
   // avoid because it will access [1] below
   if (nums.length === 0) return 0;
 
@@ -18,5 +18,3 @@ function removeDuplicates(nums: number[]): number {
   // add 1 because i is cursor
   return noDuplicateI + 1;
 }
-
-export default removeDuplicates;
diff --git a/solutions/remove_duplicates_from_sorted_array_test.ts b/solutions/remove_duplicates_from_sorted_array_test.ts
new file mode 100644
index 0000000..c615f04
--- /dev/null
+++ b/solutions/remove_duplicates_from_sorted_array_test.ts
@@ -0,0 +1,9 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import removeDuplicates from "./remove_duplicates_from_sorted_array.ts";
+
+test("26. Remove Duplicates from Sorted Array", () => {
+  assertEquals(removeDuplicates([1, 1, 2]), 2);
+  assertEquals(removeDuplicates([0, 0, 1, 1, 1, 2, 2, 3, 3, 4]), 5);
+  assertEquals(removeDuplicates([]), 0);
+});
diff --git a/solutions/reorderLogFiles.test.ts b/solutions/reorderLogFiles.test.ts
deleted file mode 100644
index 6ae03d1..0000000
--- a/solutions/reorderLogFiles.test.ts
+++ /dev/null
@@ -1,74 +0,0 @@
-import reorderLogFiles from "./reorderLogFiles";
-
-describe("937. Reorder Log Files", () => {
-  const TEST_CASES = new Map([
-    [
-      ["a1 9 2 3 1", "g1 act car", "zo4 4 7", "ab1 off key dog", "a8 act zoo"],
-      ["g1 act car", "a8 act zoo", "ab1 off key dog", "a1 9 2 3 1", "zo4 4 7"]
-    ],
-    [
-      [
-        "a1 9 2 3 1",
-        "g1 act car",
-        "zo4 4 7",
-        "ab1 off key dog",
-        "a8 act zoo",
-        "a2 act car"
-      ],
-      [
-        "a2 act car",
-        "g1 act car",
-        "a8 act zoo",
-        "ab1 off key dog",
-        "a1 9 2 3 1",
-        "zo4 4 7"
-      ]
-    ],
-    [
-      ["j mo", "5 m w", "g 07", "o 2 0", "t q h"],
-      ["5 m w", "j mo", "t q h", "g 07", "o 2 0"]
-    ],
-    [
-      [
-        "6p tzwmh ige mc",
-        "ns 566543603829",
-        "ubd cujg j d yf",
-        "ha6 1 938 376 5",
-        "3yx 97 666 56 5",
-        "d 84 34353 2249",
-        "0 tllgmf qp znc",
-        "s 1088746413789",
-        "ys0 splqqxoflgx",
-        "uhb rfrwt qzx r",
-        "u lrvmdt ykmox",
-        "ah4 4209164350",
-        "rap 7729 8 125",
-        "4 nivgc qo z i",
-        "apx 814023338 8"
-      ],
-      [
-        "ubd cujg j d yf",
-        "u lrvmdt ykmox",
-        "4 nivgc qo z i",
-        "uhb rfrwt qzx r",
-        "ys0 splqqxoflgx",
-        "0 tllgmf qp znc",
-        "6p tzwmh ige mc",
-        "ns 566543603829",
-        "ha6 1 938 376 5",
-        "3yx 97 666 56 5",
-        "d 84 34353 2249",
-        "s 1088746413789",
-        "ah4 4209164350",
-        "rap 7729 8 125",
-        "apx 814023338 8"
-      ]
-    ]
-  ]);
-
-  for (const [logs, expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${logs}]`, () => {
-      expect(reorderLogFiles(logs)).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/reorderLogFiles.ts b/solutions/reorder_log_files.ts
similarity index 93%
rename from solutions/reorderLogFiles.ts
rename to solutions/reorder_log_files.ts
index 6e03661..27a13b6 100644
--- a/solutions/reorderLogFiles.ts
+++ b/solutions/reorder_log_files.ts
@@ -1,6 +1,6 @@
 // 937. Reorder Log Files
 // https://leetcode.com/problems/reorder-log-files/
-function reorderLogFiles(logs: string[]): string[] {
+export default function reorderLogFiles(logs: string[]): string[] {
   const digitLogs = [];
   const letterLogs = [];
 
@@ -49,5 +49,3 @@ function reorderLogFiles(logs: string[]): string[] {
   // merge
   return [...letterLogs, ...digitLogs];
 }
-
-export default reorderLogFiles;
diff --git a/solutions/reorder_log_files_test.ts b/solutions/reorder_log_files_test.ts
new file mode 100644
index 0000000..4c2322d
--- /dev/null
+++ b/solutions/reorder_log_files_test.ts
@@ -0,0 +1,77 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import reorderLogFiles from "./reorder_log_files.ts";
+
+test("937. Reorder Log Files", () => {
+  assertEquals(
+    reorderLogFiles([
+      "a1 9 2 3 1",
+      "g1 act car",
+      "zo4 4 7",
+      "ab1 off key dog",
+      "a8 act zoo"
+    ]),
+    ["g1 act car", "a8 act zoo", "ab1 off key dog", "a1 9 2 3 1", "zo4 4 7"]
+  );
+  assertEquals(
+    reorderLogFiles([
+      "a1 9 2 3 1",
+      "g1 act car",
+      "zo4 4 7",
+      "ab1 off key dog",
+      "a8 act zoo",
+      "a2 act car"
+    ]),
+    [
+      "a2 act car",
+      "g1 act car",
+      "a8 act zoo",
+      "ab1 off key dog",
+      "a1 9 2 3 1",
+      "zo4 4 7"
+    ]
+  );
+  assertEquals(reorderLogFiles(["j mo", "5 m w", "g 07", "o 2 0", "t q h"]), [
+    "5 m w",
+    "j mo",
+    "t q h",
+    "g 07",
+    "o 2 0"
+  ]);
+  assertEquals(
+    reorderLogFiles([
+      "6p tzwmh ige mc",
+      "ns 566543603829",
+      "ubd cujg j d yf",
+      "ha6 1 938 376 5",
+      "3yx 97 666 56 5",
+      "d 84 34353 2249",
+      "0 tllgmf qp znc",
+      "s 1088746413789",
+      "ys0 splqqxoflgx",
+      "uhb rfrwt qzx r",
+      "u lrvmdt ykmox",
+      "ah4 4209164350",
+      "rap 7729 8 125",
+      "4 nivgc qo z i",
+      "apx 814023338 8"
+    ]),
+    [
+      "ubd cujg j d yf",
+      "u lrvmdt ykmox",
+      "4 nivgc qo z i",
+      "uhb rfrwt qzx r",
+      "ys0 splqqxoflgx",
+      "0 tllgmf qp znc",
+      "6p tzwmh ige mc",
+      "ns 566543603829",
+      "ha6 1 938 376 5",
+      "3yx 97 666 56 5",
+      "d 84 34353 2249",
+      "s 1088746413789",
+      "ah4 4209164350",
+      "rap 7729 8 125",
+      "apx 814023338 8"
+    ]
+  );
+});
diff --git a/solutions/reverseInteger.test.ts b/solutions/reverseInteger.test.ts
deleted file mode 100644
index 2c841d6..0000000
--- a/solutions/reverseInteger.test.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import reverse from "./reverseInteger";
-
-describe("7. Reverse Integer", () => {
-  const TEST_CASES = new Map([
-    [123, 321],
-    [-123, -321],
-    [-12, -21],
-    [120, 21],
-    [1563847412, 0]
-  ]);
-
-  for (const [number, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${number}`, () => {
-      expect(reverse(number)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/reverseLinkedList.test.ts b/solutions/reverseLinkedList.test.ts
deleted file mode 100644
index 9b89e11..0000000
--- a/solutions/reverseLinkedList.test.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import { createSinglyLinkedListNode } from "../testUtilities/LinkedList";
-import reverseList from "./reverseLinkedList";
-
-describe("206. Reverse Linked List", () => {
-  const TEST_CASES = new Map([
-    [[0, 1], [1, 0]],
-    [[0, 1, 2, 3], [3, 2, 1, 0]],
-    [[0], [0]],
-    [[], []]
-  ]);
-
-  for (const [values, expected] of TEST_CASES) {
-    it(`returns [${expected}] when called with [${values}]`, () => {
-      expect(reverseList(createSinglyLinkedListNode(values))).toEqual(
-        createSinglyLinkedListNode(expected)
-      );
-    });
-  }
-});
diff --git a/solutions/reverseString.test.ts b/solutions/reverseString.test.ts
deleted file mode 100644
index 6cd5c4f..0000000
--- a/solutions/reverseString.test.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import reverseString from "./reverseString";
-
-describe("344. Reverse String", () => {
-  const TEST_CASES = new Map([
-    [["h", "e", "l", "l", "o"], ["o", "l", "l", "e", "h"]],
-    [["H", "a", "n", "n", "a", "h"], ["h", "a", "n", "n", "a", "H"]]
-  ]);
-
-  for (const [chars, expected] of TEST_CASES) {
-    it(`reverses [${chars}] to be [${expected}]`, () => {
-      const characters = [...chars];
-
-      reverseString(characters);
-
-      expect(characters).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/reverseInteger.ts b/solutions/reverse_integer.ts
similarity index 89%
rename from solutions/reverseInteger.ts
rename to solutions/reverse_integer.ts
index ecddbb9..2278bb4 100644
--- a/solutions/reverseInteger.ts
+++ b/solutions/reverse_integer.ts
@@ -1,6 +1,6 @@
 // 7. Reverse Integer
 // https://leetcode.com/problems/reverse-integer/
-function reverse(x: number): number {
+export default function reverse(x: number): number {
   let currentX = x;
   let reversedX = 0;
 
@@ -17,5 +17,3 @@ function reverse(x: number): number {
     ? reversedX
     : 0;
 }
-
-export default reverse;
diff --git a/solutions/reverse_integer_test.ts b/solutions/reverse_integer_test.ts
new file mode 100644
index 0000000..c98cb97
--- /dev/null
+++ b/solutions/reverse_integer_test.ts
@@ -0,0 +1,11 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import reverse from "./reverse_integer.ts";
+
+test("7. Reverse Integer", () => {
+  assert(reverse(123) === 321);
+  assert(reverse(-123) === -321);
+  assert(reverse(-12) === -21);
+  assert(reverse(120) === 21);
+  assert(reverse(1563847412) === 0);
+});
diff --git a/solutions/reverseLinkedList.ts b/solutions/reverse_linked_list.ts
similarity index 79%
rename from solutions/reverseLinkedList.ts
rename to solutions/reverse_linked_list.ts
index 15335b9..5ebbdbd 100644
--- a/solutions/reverseLinkedList.ts
+++ b/solutions/reverse_linked_list.ts
@@ -1,8 +1,8 @@
-import { SinglyLinkedListNode } from "../types/LinkedList";
+import { SinglyLinkedListNode } from "../types/linked_list.ts";
 
 // 206. Reverse Linked List
 // https://leetcode.com/problems/reverse-linked-list/
-function reverseList<T>(
+export default function reverseList<T>(
   head: SinglyLinkedListNode<T> | null
 ): SinglyLinkedListNode<T> | null {
   if (head === null || head.next === null) return head;
@@ -16,5 +16,3 @@ function reverseList<T>(
 
   return newHead;
 }
-
-export default reverseList;
diff --git a/solutions/reverse_linked_list_test.ts b/solutions/reverse_linked_list_test.ts
new file mode 100644
index 0000000..9826aef
--- /dev/null
+++ b/solutions/reverse_linked_list_test.ts
@@ -0,0 +1,23 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import { createSinglyLinkedListNode } from "../test_utilities/linked_list.ts";
+import reverseList from "./reverse_linked_list.ts";
+
+test("206. Reverse Linked List", () => {
+  assertEquals(
+    reverseList(createSinglyLinkedListNode([0, 1])),
+    createSinglyLinkedListNode([1, 0])
+  );
+  assertEquals(
+    reverseList(createSinglyLinkedListNode([0, 1, 2, 3])),
+    createSinglyLinkedListNode([3, 2, 1, 0])
+  );
+  assertEquals(
+    reverseList(createSinglyLinkedListNode([0])),
+    createSinglyLinkedListNode([0])
+  );
+  assertEquals(
+    reverseList(createSinglyLinkedListNode([])),
+    createSinglyLinkedListNode([])
+  );
+});
diff --git a/solutions/reverseString.ts b/solutions/reverse_string.ts
similarity index 77%
rename from solutions/reverseString.ts
rename to solutions/reverse_string.ts
index 252ab28..b496cba 100644
--- a/solutions/reverseString.ts
+++ b/solutions/reverse_string.ts
@@ -1,6 +1,6 @@
 // 344. Reverse String
 // https://leetcode.com/problems/reverse-string/
-function reverseString(chars: string[]): void {
+export default function reverseString(chars: string[]): void {
   // i: 0, 1, 2..., r: 4, 3, 2...
   // r >= i is the middle of chars
   for (let i = 0, r = chars.length - 1; i < r; ++i, --r) {
@@ -8,5 +8,3 @@ function reverseString(chars: string[]): void {
     [chars[i], chars[r]] = [chars[r], chars[i]];
   }
 }
-
-export default reverseString;
diff --git a/solutions/reverse_string_test.ts b/solutions/reverse_string_test.ts
new file mode 100644
index 0000000..2658b79
--- /dev/null
+++ b/solutions/reverse_string_test.ts
@@ -0,0 +1,17 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import reverseString from "./reverse_string.ts";
+
+test("344. Reverse String", () => {
+  const chars1 = ["h", "e", "l", "l", "o"];
+
+  reverseString(chars1);
+
+  assertEquals(chars1, ["o", "l", "l", "e", "h"]);
+
+  const chars2 = ["H", "a", "n", "n", "a", "h"];
+
+  reverseString(chars2);
+
+  assertEquals(chars2, ["h", "a", "n", "n", "a", "H"]);
+});
diff --git a/solutions/romanToInteger.test.ts b/solutions/romanToInteger.test.ts
deleted file mode 100644
index 536f124..0000000
--- a/solutions/romanToInteger.test.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-import romanToInt from "./romanToInteger";
-
-describe("13. Roman to Integer", () => {
-  const TEST_CASES = new Map([
-    ["VI", 6],
-    ["IV", 4],
-    ["III", 3],
-    ["IIII", 4],
-    ["XIII", 13],
-    ["MDCLXVI", 1666],
-    ["MCDCXLXIV", 1554],
-    ["CMCDXCXLIXIV", 1443]
-  ]);
-
-  for (const [s, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${s}`, () => {
-      expect(romanToInt(s)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/romanToInteger.ts b/solutions/roman_to_integer.ts
similarity index 91%
rename from solutions/romanToInteger.ts
rename to solutions/roman_to_integer.ts
index 3e64d26..2a3ecc7 100644
--- a/solutions/romanToInteger.ts
+++ b/solutions/roman_to_integer.ts
@@ -1,6 +1,6 @@
 // 13. Roman to Integer
 // https://leetcode.com/problems/roman-to-integer/
-function romanToInt(s: string): number {
+export default function romanToInt(s: string): number {
   let total = 0;
 
   for (let i = 0; i < s.length; ++i) {
@@ -36,5 +36,3 @@ const ROMAN_CHAR_INT_MAP = new Map([
   ["D", 500],
   ["M", 1000]
 ]);
-
-export default romanToInt;
diff --git a/solutions/roman_to_integer_test.ts b/solutions/roman_to_integer_test.ts
new file mode 100644
index 0000000..b341966
--- /dev/null
+++ b/solutions/roman_to_integer_test.ts
@@ -0,0 +1,14 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import romanToInt from "./roman_to_integer.ts";
+
+test("13. Roman to Integer", () => {
+  assert(romanToInt("VI") === 6);
+  assert(romanToInt("IV") === 4);
+  assert(romanToInt("III") === 3);
+  assert(romanToInt("IIII") === 4);
+  assert(romanToInt("XIII") === 13);
+  assert(romanToInt("MDCLXVI") === 1666);
+  assert(romanToInt("MCDCXLXIV") === 1554);
+  assert(romanToInt("CMCDXCXLIXIV") === 1443);
+});
diff --git a/solutions/searchA2dMatrix2.test.ts b/solutions/searchA2dMatrix2.test.ts
deleted file mode 100644
index 4f9ac9a..0000000
--- a/solutions/searchA2dMatrix2.test.ts
+++ /dev/null
@@ -1,40 +0,0 @@
-import searchMatrix from "./searchA2dMatrix2";
-
-describe("240. Search a 2D Matrix II", () => {
-  const TEST_CASES = new Map<[number[][], number], boolean>([
-    [
-      [
-        [
-          [1, 4, 7, 11, 15],
-          [2, 5, 8, 12, 19],
-          [3, 6, 9, 16, 22],
-          [10, 13, 14, 17, 24],
-          [18, 21, 23, 26, 30]
-        ],
-        5
-      ],
-      true
-    ],
-    [
-      [
-        [
-          [1, 4, 7, 11, 15],
-          [2, 5, 8, 12, 19],
-          [3, 6, 9, 16, 22],
-          [10, 13, 14, 17, 24],
-          [18, 21, 23, 26, 30]
-        ],
-        20
-      ],
-      false
-    ]
-  ]);
-
-  for (const [[matrix, target], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${matrix.map(
-      list => `[${list}]`
-    )}] and ${target}`, () => {
-      expect(searchMatrix(matrix, target)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/searchInRotatedSortedArray.test.ts b/solutions/searchInRotatedSortedArray.test.ts
deleted file mode 100644
index a8fd1d7..0000000
--- a/solutions/searchInRotatedSortedArray.test.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import search from "./searchInRotatedSortedArray";
-
-describe("33. Search in Rotated Sorted Array", () => {
-  const TEST_CASES = new Map<[number[], number], number>([
-    [[[4, 5, 6, 7, 0, 1, 2], 0], 4],
-    [[[4, 5, 6, 7, 0, 1, 2], 3], -1],
-    [[[4, 5, 6, 7, 0, 1, 2], 4], 0],
-    [[[3, 1], 3], 0],
-    [[[7, 8, 1, 2, 3, 4, 5, 6], 2], 3]
-  ]);
-
-  for (const [[nums, target], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${nums}] and ${target}`, () => {
-      expect(search(nums, target)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/searchInsertPosition.test.ts b/solutions/searchInsertPosition.test.ts
deleted file mode 100644
index 8e76027..0000000
--- a/solutions/searchInsertPosition.test.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import searchInsert from "./searchInsertPosition";
-
-describe("35. Search Insert Position", () => {
-  const TEST_CASES = new Map<[number[], number], number>([
-    [[[1, 3, 5, 6], 5], 2],
-    [[[1, 3, 5, 6], 2], 1],
-    [[[1, 3, 5, 6], 7], 4],
-    [[[1, 3, 5, 6], 0], 0]
-  ]);
-
-  for (const [[nums, target], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${nums}] and ${target}`, () => {
-      expect(searchInsert(nums, target)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/searchA2dMatrix2.ts b/solutions/search_a2d_matrix2.ts
similarity index 100%
rename from solutions/searchA2dMatrix2.ts
rename to solutions/search_a2d_matrix2.ts
diff --git a/solutions/search_a2d_matrix2_test.ts b/solutions/search_a2d_matrix2_test.ts
new file mode 100644
index 0000000..3523e13
--- /dev/null
+++ b/solutions/search_a2d_matrix2_test.ts
@@ -0,0 +1,30 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import searchMatrix from "./search_a2d_matrix2.ts";
+
+test("240. Search a 2D Matrix II", () => {
+  assert(
+    searchMatrix(
+      [
+        [1, 4, 7, 11, 15],
+        [2, 5, 8, 12, 19],
+        [3, 6, 9, 16, 22],
+        [10, 13, 14, 17, 24],
+        [18, 21, 23, 26, 30]
+      ],
+      5
+    ) === true
+  );
+  assert(
+    searchMatrix(
+      [
+        [1, 4, 7, 11, 15],
+        [2, 5, 8, 12, 19],
+        [3, 6, 9, 16, 22],
+        [10, 13, 14, 17, 24],
+        [18, 21, 23, 26, 30]
+      ],
+      20
+    ) === false
+  );
+});
diff --git a/solutions/searchInRotatedSortedArray.ts b/solutions/search_in_rotated_sorted_array.ts
similarity index 100%
rename from solutions/searchInRotatedSortedArray.ts
rename to solutions/search_in_rotated_sorted_array.ts
diff --git a/solutions/search_in_rotated_sorted_array_test.ts b/solutions/search_in_rotated_sorted_array_test.ts
new file mode 100644
index 0000000..d29b9db
--- /dev/null
+++ b/solutions/search_in_rotated_sorted_array_test.ts
@@ -0,0 +1,11 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import search from "./search_in_rotated_sorted_array.ts";
+
+test("33. Search in Rotated Sorted Array", () => {
+  assert(search([4, 5, 6, 7, 0, 1, 2], 0) === 4);
+  assert(search([4, 5, 6, 7, 0, 1, 2], 3) === -1);
+  assert(search([4, 5, 6, 7, 0, 1, 2], 4) === 0);
+  assert(search([3, 1], 3) === 0);
+  assert(search([7, 8, 1, 2, 3, 4, 5, 6], 2) === 3);
+});
diff --git a/solutions/searchInsertPosition.ts b/solutions/search_insert_position.ts
similarity index 100%
rename from solutions/searchInsertPosition.ts
rename to solutions/search_insert_position.ts
diff --git a/solutions/search_insert_position_test.ts b/solutions/search_insert_position_test.ts
new file mode 100644
index 0000000..044651f
--- /dev/null
+++ b/solutions/search_insert_position_test.ts
@@ -0,0 +1,10 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import searchInsert from "./search_insert_position.ts";
+
+test("35. Search Insert Position", () => {
+  assert(searchInsert([1, 3, 5, 6], 5) === 2);
+  assert(searchInsert([1, 3, 5, 6], 2) === 1);
+  assert(searchInsert([1, 3, 5, 6], 7) === 4);
+  assert(searchInsert([1, 3, 5, 6], 0) === 0);
+});
diff --git a/solutions/sqrtx.test.ts b/solutions/sqrtx.test.ts
deleted file mode 100644
index e503133..0000000
--- a/solutions/sqrtx.test.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import mySqrt from "./sqrtx";
-
-describe("69. Sqrt(x)", () => {
-  const TEST_CASES = new Map([
-    [16, 4],
-    [17, 4],
-    [15, 3],
-    [8, 2],
-    [1, 1],
-    [0, 0],
-    [Number.MAX_SAFE_INTEGER, 94906265]
-  ]);
-
-  for (const [x, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${x}`, () => {
-      expect(mySqrt(x)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/sqrtx_test.ts b/solutions/sqrtx_test.ts
new file mode 100644
index 0000000..ec9fb59
--- /dev/null
+++ b/solutions/sqrtx_test.ts
@@ -0,0 +1,13 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import mySqrt from "./sqrtx.ts";
+
+test("69. Sqrt(x)", () => {
+  assert(mySqrt(16) === 4);
+  assert(mySqrt(17) === 4);
+  assert(mySqrt(15) === 3);
+  assert(mySqrt(8) === 2);
+  assert(mySqrt(1) === 1);
+  assert(mySqrt(0) === 0);
+  assert(mySqrt(Number.MAX_SAFE_INTEGER) === 94906265);
+});
diff --git a/solutions/strobogrammaticNumber.test.ts b/solutions/strobogrammaticNumber.test.ts
deleted file mode 100644
index ee1297f..0000000
--- a/solutions/strobogrammaticNumber.test.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import isStrobogrammatic from "./strobogrammaticNumber";
-
-describe("246. Strobogrammatic Number", () => {
-  const TEST_CASES = new Map([
-    ["69", true],
-    ["818", true],
-    ["962", false],
-    ["1818", false],
-    ["0", true],
-    ["6", false],
-    ["", true]
-  ]);
-
-  for (const [num, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${num}`, () => {
-      expect(isStrobogrammatic(num)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/strobogrammaticNumber.ts b/solutions/strobogrammatic_number.ts
similarity index 83%
rename from solutions/strobogrammaticNumber.ts
rename to solutions/strobogrammatic_number.ts
index 6550d8c..2b5e8ba 100644
--- a/solutions/strobogrammaticNumber.ts
+++ b/solutions/strobogrammatic_number.ts
@@ -1,6 +1,6 @@
 // 246. Strobogrammatic Number
 // https://leetcode.com/problems/strobogrammatic-number/
-function isStrobogrammatic(num: string): boolean {
+export default function isStrobogrammatic(num: string): boolean {
   // pick one by one from both of the head and tail
   for (let i = 0, j = num.length - 1; i < num.length / 2; ++i, --j) {
     const [ni, nj] = [num[i], num[j]];
@@ -13,5 +13,3 @@ function isStrobogrammatic(num: string): boolean {
 
   return true;
 }
-
-export default isStrobogrammatic;
diff --git a/solutions/strobogrammatic_number_test.ts b/solutions/strobogrammatic_number_test.ts
new file mode 100644
index 0000000..b0d4f83
--- /dev/null
+++ b/solutions/strobogrammatic_number_test.ts
@@ -0,0 +1,13 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import isStrobogrammatic from "./strobogrammatic_number.ts";
+
+test("246. Strobogrammatic Number", () => {
+  assert(isStrobogrammatic("69") === true);
+  assert(isStrobogrammatic("818") === true);
+  assert(isStrobogrammatic("962") === false);
+  assert(isStrobogrammatic("1818") === false);
+  assert(isStrobogrammatic("0") === true);
+  assert(isStrobogrammatic("6") === false);
+  assert(isStrobogrammatic("") === true);
+});
diff --git a/solutions/subsets.test.ts b/solutions/subsets.test.ts
deleted file mode 100644
index 634f0aa..0000000
--- a/solutions/subsets.test.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import subsets from "./subsets";
-
-describe("78. Subsets", () => {
-  const TEST_CASES = new Map([
-    [[1, 2, 3], [[3], [1], [2], [1, 2, 3], [1, 3], [2, 3], [1, 2], []]]
-  ]);
-
-  for (const [nums, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${nums}`, () => {
-      const result = subsets(nums);
-
-      expect([...result].sort()).toEqual([...expected].sort());
-    });
-  }
-});
diff --git a/solutions/subsets.ts b/solutions/subsets.ts
index e84aadf..2142d1c 100644
--- a/solutions/subsets.ts
+++ b/solutions/subsets.ts
@@ -1,6 +1,6 @@
 // 78. Subsets
 // https://leetcode.com/problems/subsets/
-function subsets(nums: number[]): number[][] {
+export default function subsets(nums: number[]): number[][] {
   const result = [];
 
   for (let i = 0; i < Math.pow(2, nums.length); ++i) {
@@ -18,5 +18,3 @@ function subsets(nums: number[]): number[][] {
 
   return result;
 }
-
-export default subsets;
diff --git a/solutions/subsets_test.ts b/solutions/subsets_test.ts
new file mode 100644
index 0000000..98e22cc
--- /dev/null
+++ b/solutions/subsets_test.ts
@@ -0,0 +1,10 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import subsets from "./subsets.ts";
+
+test("78. Subsets", () => {
+  assertEquals(
+    subsets([1, 2, 3]).sort(),
+    [[3], [1], [2], [1, 2, 3], [1, 3], [2, 3], [1, 2], []].sort()
+  );
+});
diff --git a/solutions/subtreeOfAnotherTree.test.ts b/solutions/subtreeOfAnotherTree.test.ts
deleted file mode 100644
index 7dc4630..0000000
--- a/solutions/subtreeOfAnotherTree.test.ts
+++ /dev/null
@@ -1,47 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import isSubtree from "./subtreeOfAnotherTree";
-
-describe("572. Subtree of Another Tree", () => {
-  const TEST_CASES = new Map<[(number | null)[], (number | null)[]], boolean>([
-    [[[4, 4, 5, 1, 2], [4, 1, 2]], true],
-    [[[4, 4, 5, 1, 2, null, null, null, null, 0], [4, 1, 2]], false],
-    [
-      [
-        [
-          1,
-          null,
-          1,
-          null,
-          1,
-          null,
-          1,
-          null,
-          1,
-          null,
-          1,
-          null,
-          1,
-          null,
-          1,
-          null,
-          1,
-          null,
-          1,
-          null,
-          1,
-          2
-        ],
-        [1, null, 1, null, 1, null, 1, null, 1, null, 1, 2]
-      ],
-      true
-    ]
-  ]);
-
-  for (const [[s, t], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${s}] and [${t}]`, () => {
-      expect(
-        isSubtree(createBinaryTreeNode(s)!, createBinaryTreeNode(t)!)
-      ).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/subtreeOfAnotherTree.ts b/solutions/subtree_of_another_tree.ts
similarity index 91%
rename from solutions/subtreeOfAnotherTree.ts
rename to solutions/subtree_of_another_tree.ts
index 982e2bf..61ca5e3 100644
--- a/solutions/subtreeOfAnotherTree.ts
+++ b/solutions/subtree_of_another_tree.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 572. Subtree of Another Tree
 // https://leetcode.com/problems/subtree-of-another-tree/
diff --git a/solutions/subtree_of_another_tree_test.ts b/solutions/subtree_of_another_tree_test.ts
new file mode 100644
index 0000000..043856c
--- /dev/null
+++ b/solutions/subtree_of_another_tree_test.ts
@@ -0,0 +1,48 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import isSubtree from "./subtree_of_another_tree.ts";
+
+test("572. Subtree of Another Tree", () => {
+  assert(
+    isSubtree(
+      createBinaryTreeNode([4, 4, 5, 1, 2]),
+      createBinaryTreeNode([4, 1, 2])
+    ) === true
+  );
+  assert(
+    isSubtree(
+      createBinaryTreeNode([4, 4, 5, 1, 2, null, null, null, null, 0]),
+      createBinaryTreeNode([4, 1, 2])
+    ) === false
+  );
+  assert(
+    isSubtree(
+      createBinaryTreeNode([
+        1,
+        null,
+        1,
+        null,
+        1,
+        null,
+        1,
+        null,
+        1,
+        null,
+        1,
+        null,
+        1,
+        null,
+        1,
+        null,
+        1,
+        null,
+        1,
+        null,
+        1,
+        2
+      ]),
+      createBinaryTreeNode([1, null, 1, null, 1, null, 1, null, 1, null, 1, 2])
+    ) === true
+  );
+});
diff --git a/solutions/symmetricTree.test.ts b/solutions/symmetricTree.test.ts
deleted file mode 100644
index 9f17f6d..0000000
--- a/solutions/symmetricTree.test.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import isSymmetric from "./symmetricTree";
-
-describe("101. Symmetric Tree", () => {
-  const TEST_CASES = new Map([
-    [[1, 2, 2, 3, 4, 4, 3], true],
-    [[1, 2, 2, 3, null, 3, null], false],
-    [[1, 2, 2, 3, null, null, 3], true],
-    [[], true]
-  ]);
-
-  for (const [values, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}]`, () => {
-      expect(isSymmetric(createBinaryTreeNode(values))).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/symmetricTree.ts b/solutions/symmetric_tree.ts
similarity index 82%
rename from solutions/symmetricTree.ts
rename to solutions/symmetric_tree.ts
index 387e832..0ca372e 100644
--- a/solutions/symmetricTree.ts
+++ b/solutions/symmetric_tree.ts
@@ -1,8 +1,10 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 101. Symmetric Tree
 // https://leetcode.com/problems/symmetric-tree/
-function isSymmetric<T>(node: BinaryTreeNode<T> | null): boolean {
+export default function isSymmetric<T>(
+  node: BinaryTreeNode<T> | null
+): boolean {
   // check recursively for each outside-elements
   function isEqual<T>(
     node1: BinaryTreeNode<T> | null,
@@ -30,5 +32,3 @@ function isSymmetric<T>(node: BinaryTreeNode<T> | null): boolean {
 
   return isEqual(node.left, node.right);
 }
-
-export default isSymmetric;
diff --git a/solutions/symmetric_tree_test.ts b/solutions/symmetric_tree_test.ts
new file mode 100644
index 0000000..f0f49f3
--- /dev/null
+++ b/solutions/symmetric_tree_test.ts
@@ -0,0 +1,15 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import isSymmetric from "./symmetric_tree.ts";
+
+test("101. Symmetric Tree", () => {
+  assert(isSymmetric(createBinaryTreeNode([1, 2, 2, 3, 4, 4, 3])) === true);
+  assert(
+    isSymmetric(createBinaryTreeNode([1, 2, 2, 3, null, 3, null])) === false
+  );
+  assert(
+    isSymmetric(createBinaryTreeNode([1, 2, 2, 3, null, null, 3])) === true
+  );
+  assert(isSymmetric(createBinaryTreeNode([])) === true);
+});
diff --git a/solutions/twoSum.test.ts b/solutions/twoSum.test.ts
deleted file mode 100644
index 6245aad..0000000
--- a/solutions/twoSum.test.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import twoSum from "./twoSum";
-
-describe("1. Two Sum", () => {
-  const TEST_CASES = new Map<[number[], number], [number, number]>([
-    [[[2, 7, 11, 15], 9], [0, 1]],
-    [[[2, 7, 11, 15], 18], [1, 2]]
-  ]);
-
-  for (const [[nums, target], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${nums}] and ${target}`, () => {
-      expect(twoSum(nums, target)).toEqual(expected);
-    });
-  }
-});
diff --git a/solutions/twoSum.ts b/solutions/two_sum.ts
similarity index 85%
rename from solutions/twoSum.ts
rename to solutions/two_sum.ts
index a6be400..9d60286 100644
--- a/solutions/twoSum.ts
+++ b/solutions/two_sum.ts
@@ -1,6 +1,9 @@
 // 1. Two Sum
 // https://leetcode.com/problems/two-sum/
-function twoSum(nums: number[], target: number): [number, number] {
+export default function twoSum(
+  nums: number[],
+  target: number
+): [number, number] {
   // Map<number, index>
   const map = new Map<number, number>();
 
@@ -19,5 +22,3 @@ function twoSum(nums: number[], target: number): [number, number] {
 
   throw new Error("there's no answer.");
 }
-
-export default twoSum;
diff --git a/solutions/two_sum_test.ts b/solutions/two_sum_test.ts
new file mode 100644
index 0000000..e2d73dd
--- /dev/null
+++ b/solutions/two_sum_test.ts
@@ -0,0 +1,8 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import twoSum from "./two_sum.ts";
+
+test("1. Two Sum", () => {
+  assertEquals(twoSum([2, 7, 11, 15], 9), [0, 1]);
+  assertEquals(twoSum([2, 7, 11, 15], 18), [1, 2]);
+});
diff --git a/solutions/uniqueEmailAddresses.test.ts b/solutions/uniqueEmailAddresses.test.ts
deleted file mode 100644
index 4944005..0000000
--- a/solutions/uniqueEmailAddresses.test.ts
+++ /dev/null
@@ -1,28 +0,0 @@
-import numUniqueEmails from "./uniqueEmailAddresses";
-
-describe("929. Unique Email Addresses", () => {
-  const TEST_CASES = new Map([
-    [
-      [
-        "test.email+alex@leetcode.com",
-        "test.e.mail+bob.cathy@leetcode.com",
-        "testemail+david@lee.tcode.com"
-      ],
-      2
-    ],
-    [
-      [
-        "testemail@leetcode.com",
-        "testemail1@leetcode.com",
-        "testemail+david@lee.tcode.com"
-      ],
-      3
-    ]
-  ]);
-
-  for (const [emails, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${emails}]`, () => {
-      expect(numUniqueEmails(emails)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/uniquePaths.test.ts b/solutions/uniquePaths.test.ts
deleted file mode 100644
index 6cb0a24..0000000
--- a/solutions/uniquePaths.test.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import uniquePaths from "./uniquePaths";
-
-describe("62. Unique Paths", () => {
-  const TEST_CASES = new Map([[[3, 2], 3], [[7, 3], 28]]);
-
-  for (const [[m, n], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${m} and ${n}`, () => {
-      expect(uniquePaths(m, n)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/uniqueEmailAddresses.ts b/solutions/unique_email_addresses.ts
similarity index 77%
rename from solutions/uniqueEmailAddresses.ts
rename to solutions/unique_email_addresses.ts
index de8b2de..db47cb1 100644
--- a/solutions/uniqueEmailAddresses.ts
+++ b/solutions/unique_email_addresses.ts
@@ -1,6 +1,6 @@
 // 929. Unique Email Addresses
 // https://leetcode.com/problems/unique-email-addresses/
-function numUniqueEmails(emails: string[]): number {
+export default function numUniqueEmails(emails: string[]): number {
   const unique = new Set();
 
   for (const email of emails) {
@@ -10,5 +10,3 @@ function numUniqueEmails(emails: string[]): number {
 
   return unique.size;
 }
-
-export default numUniqueEmails;
diff --git a/solutions/unique_email_addresses_test.ts b/solutions/unique_email_addresses_test.ts
new file mode 100644
index 0000000..4c593d7
--- /dev/null
+++ b/solutions/unique_email_addresses_test.ts
@@ -0,0 +1,20 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import numUniqueEmails from "./unique_email_addresses.ts";
+
+test("929. Unique Email Addresses", () => {
+  assert(
+    numUniqueEmails([
+      "test.email+alex@leetcode.com",
+      "test.e.mail+bob.cathy@leetcode.com",
+      "testemail+david@lee.tcode.com"
+    ]) === 2
+  );
+  assert(
+    numUniqueEmails([
+      "testemail@leetcode.com",
+      "testemail1@leetcode.com",
+      "testemail+david@lee.tcode.com"
+    ]) === 3
+  );
+});
diff --git a/solutions/uniquePaths.ts b/solutions/unique_paths.ts
similarity index 100%
rename from solutions/uniquePaths.ts
rename to solutions/unique_paths.ts
diff --git a/solutions/unique_paths_test.ts b/solutions/unique_paths_test.ts
new file mode 100644
index 0000000..b43b90a
--- /dev/null
+++ b/solutions/unique_paths_test.ts
@@ -0,0 +1,8 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import uniquePaths from "./unique_paths.ts";
+
+test("62. Unique Paths", () => {
+  assert(uniquePaths(3, 2) === 3);
+  assert(uniquePaths(7, 3) === 28);
+});
diff --git a/solutions/validAnagram.test.ts b/solutions/validAnagram.test.ts
deleted file mode 100644
index a39be7f..0000000
--- a/solutions/validAnagram.test.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import isAnagram from "./validAnagram";
-
-describe("242. Valid Anagram", () => {
-  const TEST_CASES = new Map([
-    [["anagram", "nagaram"], true],
-    [["car", "rat"], false],
-    [["a", "aa"], false]
-  ]);
-
-  for (const [[s, t], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${s} and ${t}`, () => {
-      expect(isAnagram(s, t)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/validPalindrome.test.ts b/solutions/validPalindrome.test.ts
deleted file mode 100644
index ee790df..0000000
--- a/solutions/validPalindrome.test.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-import isPalindrome from "./validPalindrome";
-
-describe("125. Valid Palindrome", () => {
-  const TEST_CASES = new Map([
-    ["A man, a plan, a canal: Panama", true],
-    ["race a car", false],
-    ["", true],
-    ["0P", false]
-  ]);
-
-  for (const [s, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${s}`, () => {
-      expect(isPalindrome(s)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/validParentheses.test.ts b/solutions/validParentheses.test.ts
deleted file mode 100644
index 0e97cb6..0000000
--- a/solutions/validParentheses.test.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-import isValid from "./validParentheses";
-
-describe("20. Valid Parentheses", () => {
-  const TEST_CASES = new Map([
-    ["()", true],
-    ["()[]{}", true],
-    ["(]", false],
-    ["([)]", false],
-    ["{[]}", true],
-    ["[", false],
-    ["[{", false]
-  ]);
-
-  for (const [s, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with ${s}`, () => {
-      expect(isValid(s)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/validAnagram.ts b/solutions/valid_anagram.ts
similarity index 100%
rename from solutions/validAnagram.ts
rename to solutions/valid_anagram.ts
diff --git a/solutions/valid_anagram_test.ts b/solutions/valid_anagram_test.ts
new file mode 100644
index 0000000..e9b54ea
--- /dev/null
+++ b/solutions/valid_anagram_test.ts
@@ -0,0 +1,9 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import isAnagram from "./valid_anagram.ts";
+
+test("242. Valid Anagram", () => {
+  assert(isAnagram("anagram", "nagaram") === true);
+  assert(isAnagram("car", "rat") === false);
+  assert(isAnagram("a", "aa") === false);
+});
diff --git a/solutions/validPalindrome.ts b/solutions/valid_palindrome.ts
similarity index 90%
rename from solutions/validPalindrome.ts
rename to solutions/valid_palindrome.ts
index fd900b0..6cd2739 100644
--- a/solutions/validPalindrome.ts
+++ b/solutions/valid_palindrome.ts
@@ -1,6 +1,6 @@
 // 125. Valid Palindrome
 // https://leetcode.com/problems/valid-palindrome/
-function isPalindrome(s: string): boolean {
+export default function isPalindrome(s: string): boolean {
   const sanitized = [];
 
   for (let i = 0; i < s.length; ++i) {
@@ -32,5 +32,3 @@ function isPalindrome(s: string): boolean {
 
   return true;
 }
-
-export default isPalindrome;
diff --git a/solutions/valid_palindrome_test.ts b/solutions/valid_palindrome_test.ts
new file mode 100644
index 0000000..f509345
--- /dev/null
+++ b/solutions/valid_palindrome_test.ts
@@ -0,0 +1,10 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import isPalindrome from "./valid_palindrome.ts";
+
+test("125. Valid Palindrome", () => {
+  assert(isPalindrome("A man, a plan, a canal: Panama") === true);
+  assert(isPalindrome("race a car") === false);
+  assert(isPalindrome("") === true);
+  assert(isPalindrome("0P") === false);
+});
diff --git a/solutions/validParentheses.ts b/solutions/valid_parentheses.ts
similarity index 91%
rename from solutions/validParentheses.ts
rename to solutions/valid_parentheses.ts
index 0bb5ed0..16ad426 100644
--- a/solutions/validParentheses.ts
+++ b/solutions/valid_parentheses.ts
@@ -1,6 +1,6 @@
 // 20. Valid Parentheses
 // https://leetcode.com/problems/valid-parentheses/
-function isValid(s: string): boolean {
+export default function isValid(s: string): boolean {
   let stack: string[] = [];
 
   for (let i = 0; i < s.length; ++i) {
@@ -23,5 +23,3 @@ function isValid(s: string): boolean {
 // FYI: it doesn't so much faster even if you change these into char code (number)
 const OPEN_BRACKET_SET = new Set(["(", "[", "{"]);
 const BRACKET_PAIR_MAP = new Map([[")", "("], ["]", "["], ["}", "{"]]);
-
-export default isValid;
diff --git a/solutions/valid_parentheses_test.ts b/solutions/valid_parentheses_test.ts
new file mode 100644
index 0000000..a87561e
--- /dev/null
+++ b/solutions/valid_parentheses_test.ts
@@ -0,0 +1,13 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import isValid from "./valid_parentheses.ts";
+
+test("20. Valid Parentheses", () => {
+  assert(isValid("()") === true);
+  assert(isValid("()[]{}") === true);
+  assert(isValid("(]") === false);
+  assert(isValid("([)]") === false);
+  assert(isValid("{[]}") === true);
+  assert(isValid("[") === false);
+  assert(isValid("[{") === false);
+});
diff --git a/solutions/validateBinarySearchTree.test.ts b/solutions/validateBinarySearchTree.test.ts
deleted file mode 100644
index a6f127e..0000000
--- a/solutions/validateBinarySearchTree.test.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import { createBinaryTreeNode } from "../testUtilities/BinaryTree";
-import isValidBST from "./validateBinarySearchTree";
-
-describe("98. Validate Binary Search Tree", () => {
-  const TEST_CASES = new Map([
-    [[2, 1, 3], true],
-    [[5, 1, 4, null, null, 3, 6], false],
-    [[1, 1], false],
-    [[], true]
-  ]);
-
-  for (const [values, expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${values}]`, () => {
-      expect(isValidBST(createBinaryTreeNode(values))).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/validateBinarySearchTree.ts b/solutions/validate_binary_search_tree.ts
similarity index 88%
rename from solutions/validateBinarySearchTree.ts
rename to solutions/validate_binary_search_tree.ts
index d50d8e1..35fd9e5 100644
--- a/solutions/validateBinarySearchTree.ts
+++ b/solutions/validate_binary_search_tree.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 // 98. Validate Binary Search Tree
 // https://leetcode.com/problems/validate-binary-search-tree/
diff --git a/solutions/validate_binary_search_tree_test.ts b/solutions/validate_binary_search_tree_test.ts
new file mode 100644
index 0000000..857a103
--- /dev/null
+++ b/solutions/validate_binary_search_tree_test.ts
@@ -0,0 +1,13 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "../test_utilities/binary_tree.ts";
+import isValidBST from "./validate_binary_search_tree.ts";
+
+test("98. Validate Binary Search Tree", () => {
+  assert(isValidBST(createBinaryTreeNode([2, 1, 3])) === true);
+  assert(
+    isValidBST(createBinaryTreeNode([5, 1, 4, null, null, 3, 6])) === false
+  );
+  assert(isValidBST(createBinaryTreeNode([1, 1])) === false);
+  assert(isValidBST(createBinaryTreeNode([])) === true);
+});
diff --git a/solutions/verifyingAnAlienDictionary.test.ts b/solutions/verifyingAnAlienDictionary.test.ts
deleted file mode 100644
index dbbdf29..0000000
--- a/solutions/verifyingAnAlienDictionary.test.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import isAlienSorted from "./verifyingAnAlienDictionary";
-
-describe("953. Verifying an Alien Dictionary", () => {
-  const TEST_CASES = new Map<[string[], string], boolean>([
-    [[["hello", "leetcode"], "hlabcdefgijkmnopqrstuvwxyz"], true],
-    [[["word", "world", "row"], "worldabcefghijkmnpqstuvxyz"], false],
-    [[["apple", "app"], "abcdefghijklmnopqrstuvwxyz"], false]
-  ]);
-
-  for (const [[words, order], expected] of TEST_CASES) {
-    it(`returns ${expected} when called with [${words}] and ${order}`, () => {
-      expect(isAlienSorted(words, order)).toBe(expected);
-    });
-  }
-});
diff --git a/solutions/verifyingAnAlienDictionary.ts b/solutions/verifying_an_alien_dictionary.ts
similarity index 91%
rename from solutions/verifyingAnAlienDictionary.ts
rename to solutions/verifying_an_alien_dictionary.ts
index 7ebd2c0..d6d8c3c 100644
--- a/solutions/verifyingAnAlienDictionary.ts
+++ b/solutions/verifying_an_alien_dictionary.ts
@@ -1,6 +1,6 @@
 // 953. Verifying an Alien Dictionary
 // https://leetcode.com/problems/verifying-an-alien-dictionary/
-function isAlienSorted(words: string[], order: string): boolean {
+export default function isAlienSorted(words: string[], order: string): boolean {
   // make shallow copy to delete checked words below
   let _words = [...words];
   let i = 0;
@@ -35,5 +35,3 @@ function isAlienSorted(words: string[], order: string): boolean {
 
   return true;
 }
-
-export default isAlienSorted;
diff --git a/solutions/verifying_an_alien_dictionary_test.ts b/solutions/verifying_an_alien_dictionary_test.ts
new file mode 100644
index 0000000..f80dbab
--- /dev/null
+++ b/solutions/verifying_an_alien_dictionary_test.ts
@@ -0,0 +1,16 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert } from "https://deno.land/std/testing/asserts.ts";
+import isAlienSorted from "./verifying_an_alien_dictionary.ts";
+
+test("953. Verifying an Alien Dictionary", () => {
+  assert(
+    isAlienSorted(["hello", "leetcode"], "hlabcdefgijkmnopqrstuvwxyz") === true
+  );
+  assert(
+    isAlienSorted(["word", "world", "row"], "worldabcefghijkmnpqstuvxyz") ===
+      false
+  );
+  assert(
+    isAlienSorted(["apple", "app"], "abcdefghijklmnopqrstuvwxyz") === false
+  );
+});
diff --git a/testUtilities/BinaryTree.test.ts b/testUtilities/BinaryTree.test.ts
deleted file mode 100644
index 08512d5..0000000
--- a/testUtilities/BinaryTree.test.ts
+++ /dev/null
@@ -1,73 +0,0 @@
-import { createBinaryTreeNode } from "./BinaryTree";
-
-describe("createBinaryTreeNode", () => {
-  it("creates BinaryTreeNode by an array #1", () => {
-    expect(createBinaryTreeNode([1, 2, 3])).toEqual({
-      val: 1,
-      left: {
-        val: 2,
-        left: null,
-        right: null
-      },
-      right: {
-        val: 3,
-        left: null,
-        right: null
-      }
-    });
-  });
-
-  it("creates BinaryTreeNode by an array #2", () => {
-    expect(createBinaryTreeNode([1, null, 2, 3])).toEqual({
-      val: 1,
-      left: null,
-      right: {
-        val: 2,
-        left: {
-          val: 3,
-          left: null,
-          right: null
-        },
-        right: null
-      }
-    });
-  });
-
-  it("creates BinaryTreeNode by an array #3", () => {
-    expect(
-      createBinaryTreeNode([5, 4, 7, 3, null, 2, null, -1, null, 9])
-    ).toEqual({
-      val: 5,
-      left: {
-        val: 4,
-        left: {
-          val: 3,
-          left: {
-            val: -1,
-            left: null,
-            right: null
-          },
-          right: null
-        },
-        right: null
-      },
-      right: {
-        val: 7,
-        left: {
-          val: 2,
-          left: {
-            val: 9,
-            left: null,
-            right: null
-          },
-          right: null
-        },
-        right: null
-      }
-    });
-  });
-
-  it("returns null by an empty array", () => {
-    expect(createBinaryTreeNode([])).toEqual(null);
-  });
-});
diff --git a/testUtilities/LinkedList.test.ts b/testUtilities/LinkedList.test.ts
deleted file mode 100644
index c9c2d7f..0000000
--- a/testUtilities/LinkedList.test.ts
+++ /dev/null
@@ -1,96 +0,0 @@
-import { createSinglyLinkedListNode, getNthNode } from "./LinkedList";
-
-describe("createSinglyLinkedListNode", () => {
-  test("creates SinglyLinkedListNode by an array #1", () => {
-    expect(createSinglyLinkedListNode([1, 2, 3, 4, 5, 6, 7])).toEqual({
-      val: 1,
-      next: {
-        val: 2,
-        next: {
-          val: 3,
-          next: {
-            val: 4,
-            next: {
-              val: 5,
-              next: {
-                val: 6,
-                next: {
-                  val: 7,
-                  next: null
-                }
-              }
-            }
-          }
-        }
-      }
-    });
-  });
-
-  test("creates SinglyLinkedListNode by an array #2", () => {
-    expect(createSinglyLinkedListNode([1])).toEqual({
-      val: 1,
-      next: null
-    });
-  });
-
-  test("returns null if the given array has no element", () => {
-    expect(createSinglyLinkedListNode([])).toBe(null);
-  });
-});
-
-describe("getNthNode()", () => {
-  it("returns the first node in a linked list if called with 0 index", () => {
-    const head = createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!;
-
-    expect(getNthNode(head, 0).val).toBe(0);
-  });
-
-  it("returns the 3rd node in a linked list if called with 2 index", () => {
-    const head = createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!;
-
-    expect(getNthNode(head, 2).val).toBe(2);
-  });
-
-  it("returns the last node in a linked list if called with -1 index", () => {
-    const head = createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!;
-
-    expect(getNthNode(head, -1)).toBe(getNthNode(head, 5));
-  });
-
-  it("returns the 3rd node from the tail in a linked list if called with -3 index", () => {
-    const head = createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!;
-
-    expect(getNthNode(head, -3)).toBe(getNthNode(head, 3));
-  });
-
-  it("doesn't mutates the given linked list at all", () => {
-    const head = createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!;
-
-    getNthNode(head, 1);
-    getNthNode(head, 2);
-    getNthNode(head, 3);
-
-    expect(getNthNode(head, 2).val).toBe(2);
-  });
-
-  it("throws an Error if the index is out of bounds (when called with 7 for a 6-nodes linked list)", () => {
-    const head = createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!;
-
-    expect(() => getNthNode(head, 7)).toThrow(Error);
-  });
-
-  it("throws an Error if the index is out of bounds (when called with -7 for a 6-nodes linked list)", () => {
-    const head = createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!;
-
-    expect(() => getNthNode(head, -7)).toThrow(Error);
-  });
-
-  it("throws a TypeError if the index is not an integer", () => {
-    const head = createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!;
-
-    expect(() => getNthNode(head, 1.1)).toThrow(TypeError);
-    expect(() => getNthNode(head, Infinity)).toThrow(TypeError);
-    expect(() => getNthNode(head, -Infinity)).toThrow(TypeError);
-    expect(() => getNthNode(head, NaN)).toThrow(TypeError);
-  });
-});
diff --git a/testUtilities/BinaryTree.ts b/test_utilities/binary_tree.ts
similarity index 94%
rename from testUtilities/BinaryTree.ts
rename to test_utilities/binary_tree.ts
index 9f98ecc..be2a823 100644
--- a/testUtilities/BinaryTree.ts
+++ b/test_utilities/binary_tree.ts
@@ -1,4 +1,4 @@
-import { BinaryTreeNode } from "../types/BinaryTree";
+import { BinaryTreeNode } from "../types/binary_tree.ts";
 
 export function createBinaryTreeNode<T>(
   array: (T | null)[]
diff --git a/test_utilities/binary_tree_test.ts b/test_utilities/binary_tree_test.ts
new file mode 100644
index 0000000..62bace3
--- /dev/null
+++ b/test_utilities/binary_tree_test.ts
@@ -0,0 +1,53 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert, assertEquals } from "https://deno.land/std/testing/asserts.ts";
+import { createBinaryTreeNode } from "./binary_tree.ts";
+
+  test("createBinaryTreeNode() returns a BinaryTreeNode", () => {
+    assertEquals(createBinaryTreeNode([1, 2, 3]), { val: 1, left: { val: 2, left: null, right: null }, right: { val: 3, left: null, right: null }});
+    assertEquals(createBinaryTreeNode([1, null, 2, 3]), { val: 1,
+      left: null,
+      right: {
+        val: 2,
+        left: {
+          val: 3,
+          left: null,
+          right: null
+        },
+        right: null
+      }});
+    assertEquals(createBinaryTreeNode([5, 4, 7, 3, null, 2, null, -1, null, 9]), {
+      val: 5,
+      left: {
+        val: 4,
+        left: {
+          val: 3,
+          left: {
+            val: -1,
+            left: null,
+            right: null
+          },
+          right: null
+        },
+        right: null
+      },
+      right: {
+        val: 7,
+        left: {
+          val: 2,
+          left: {
+            val: 9,
+            left: null,
+            right: null
+          },
+          right: null
+        },
+        right: null
+      }
+    });
+    assertEquals(createBinaryTreeNode([1, 2, 3]), { val: 1, left: { val: 2, left: null, right: null }, right: { val: 3, left: null, right: null }});
+    assertEquals(createBinaryTreeNode([1, 2, 3]), { val: 1, left: { val: 2, left: null, right: null }, right: { val: 3, left: null, right: null }});
+  });
+
+  test("createBinaryTreeNode() returns null when the given array is empty", () => {
+    assert(createBinaryTreeNode([]) === null);
+  });
\ No newline at end of file
diff --git a/testUtilities/LinkedList.ts b/test_utilities/linked_list.ts
similarity index 93%
rename from testUtilities/LinkedList.ts
rename to test_utilities/linked_list.ts
index 8cb60c4..1a16e6e 100644
--- a/testUtilities/LinkedList.ts
+++ b/test_utilities/linked_list.ts
@@ -1,4 +1,4 @@
-import { SinglyLinkedListNode } from "../types/LinkedList";
+import { SinglyLinkedListNode } from "../types/linked_list.ts";
 
 export function createSinglyLinkedListNode<T>(
   array: T[]
diff --git a/test_utilities/linked_list_test.ts b/test_utilities/linked_list_test.ts
new file mode 100644
index 0000000..c2a89a4
--- /dev/null
+++ b/test_utilities/linked_list_test.ts
@@ -0,0 +1,67 @@
+import { test } from "https://deno.land/std/testing/mod.ts";
+import { assert, assertEquals, assertThrows } from "https://deno.land/std/testing/asserts.ts";
+import { createSinglyLinkedListNode, getNthNode } from "./linked_list.ts";
+
+
+  test("createSinglyLinkedListNode() returns a SinglyLinkedListNode by the given array", () => {
+    assertEquals(createSinglyLinkedListNode([1, 2, 3, 4, 5, 6, 7]), {
+      val: 1,
+      next: {
+        val: 2,
+        next: {
+          val: 3,
+          next: {
+            val: 4,
+            next: {
+              val: 5,
+              next: {
+                val: 6,
+                next: {
+                  val: 7,
+                  next: null
+                }
+              }
+            }
+          }
+        }
+      }
+    });
+    assertEquals(createSinglyLinkedListNode([1]), {
+      val: 1,
+      next: null
+    });
+  });
+
+  test("createSinglyLinkedListNode() returns null if the given array is empty", () => {
+    assert(createSinglyLinkedListNode([]) === null);
+  });
+
+
+  test("getNthNode(node, n) returns the n-th node", () => {
+    assert(getNthNode(createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!, 0).val === 0);
+    assert(getNthNode(createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!, 2).val === 2);
+    assert(getNthNode(createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!, -1).val === 5);
+    assert(getNthNode(createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!, -3).val === 3);
+  });
+
+  test("getNthNode(node, n) doesn't mutates the given linked list", () => {
+    const head = createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!;
+
+    getNthNode(head, 1);
+    getNthNode(head, 2);
+    getNthNode(head, 3);
+
+    assert(getNthNode(head, 2).val === 2);
+  });
+
+  test("getNthNode(node, n) throws an Error if the given index is out of bounds", () => {
+    assertThrows(() => getNthNode(createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!, 7), Error);
+    assertThrows(() => getNthNode(createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!, -7), Error);
+  });
+
+  test("getNthNode(node, n) throws a TypeError if the given index is not an integer", () => {
+    assertThrows(() => getNthNode(createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!, 1.1), TypeError);
+    assertThrows(() => getNthNode(createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!, Infinity), TypeError);
+    assertThrows(() => getNthNode(createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!, -Infinity), TypeError);
+    assertThrows(() => getNthNode(createSinglyLinkedListNode([0, 1, 2, 3, 4, 5])!, NaN), TypeError);
+  });
diff --git a/tsconfig.json b/tsconfig.json
deleted file mode 100644
index 3b38d7f..0000000
--- a/tsconfig.json
+++ /dev/null
@@ -1,21 +0,0 @@
-{
-  "compilerOptions": {
-    "incremental": true,
-    "target": "es2017",
-    "noEmit": true,
-    "strict": true,
-    "noImplicitAny": true,
-    "strictNullChecks": true,
-    "strictFunctionTypes": true,
-    "strictBindCallApply": true,
-    "strictPropertyInitialization": true,
-    "noImplicitThis": true,
-    "alwaysStrict": true,
-    "noUnusedLocals": true,
-    "noUnusedParameters": true,
-    "noImplicitReturns": true,
-    "noFallthroughCasesInSwitch": true,
-    "forceConsistentCasingInFileNames": true
-  },
-  "exclude": ["node_modules"]
-}
diff --git a/types/BinaryTree.ts b/types/binary_tree.ts
similarity index 100%
rename from types/BinaryTree.ts
rename to types/binary_tree.ts
diff --git a/types/LinkedList.ts b/types/linked_list.ts
similarity index 100%
rename from types/LinkedList.ts
rename to types/linked_list.ts