diff --git a/src/test/java/cn/byhieg/algorithmtutorialtest/BinaryTreeTest.java b/src/test/java/cn/byhieg/algorithmtutorialtest/BinaryTreeTest.java
index 9c1cfa5..a3ad6af 100644
--- a/src/test/java/cn/byhieg/algorithmtutorialtest/BinaryTreeTest.java
+++ b/src/test/java/cn/byhieg/algorithmtutorialtest/BinaryTreeTest.java
@@ -8,7 +8,6 @@
  * Mail to byhieg@gmail.com
  */
 public class BinaryTreeTest extends TestCase {
-
     BinaryTree.Node root = new BinaryTree.Node(1);
     public void setUp() throws Exception {
         super.setUp();
@@ -85,4 +84,4 @@ public void testCalcKNodes() throws Exception {
     public void testMirror() throws Exception {
         BinaryTree.mirror(root);
     }
-}
\ No newline at end of file
+}
diff --git a/src/test/java/cn/byhieg/algorithmtutorialtest/SortTest.java b/src/test/java/cn/byhieg/algorithmtutorialtest/SortTest.java
index 046daca..df8c303 100644
--- a/src/test/java/cn/byhieg/algorithmtutorialtest/SortTest.java
+++ b/src/test/java/cn/byhieg/algorithmtutorialtest/SortTest.java
@@ -13,7 +13,7 @@ public void setUp() throws Exception {
         super.setUp();
         nums = new int[]{10, 20, 2, 3, 1, 100, 45, 22, 51, 21};
     }
-
+    
     public void tearDown() throws Exception {
         for (int i = 0 ; i < nums.length;i++){
             System.out.print(nums[i] + " ");
diff --git a/src/test/java/cn/byhieg/algorithmtutorialtest/ss.java b/src/test/java/cn/byhieg/algorithmtutorialtest/ss.java
new file mode 100644
index 0000000..2aaf863
--- /dev/null
+++ b/src/test/java/cn/byhieg/algorithmtutorialtest/ss.java
@@ -0,0 +1,5 @@
+package cn.byhieg.algorithmtutorialtest;
+
+public class ss {
+
+}