immutable-js · jdeniau · Jun 9, 2025 · Jun 9, 2025
diff --git a/__tests__/utils/arrCopy.ts b/__tests__/utils/arrCopy.ts
@@ -0,0 +1,38 @@
+import { describe, it, expect } from '@jest/globals';
+import arrCopy from '../../src/utils/arrCopy';
+
+describe('arrCopy', () => {
+  it('should copy an array without offset', () => {
+    const arr = [1, 2, 3, 4];
+    const result = arrCopy(arr);
+    expect(result).toEqual([1, 2, 3, 4]);
+    expect(result).not.toBe(arr); // Should be a new array
+  });
+
+  it('should copy an array with offset', () => {
+    const arr = [1, 2, 3, 4, 5];
+    const result = arrCopy(arr, 2);
+    expect(result).toEqual([3, 4, 5]);
+  });
+
+  it('should return an empty array if offset >= arr.length', () => {
+    const arr = [1, 2, 3];
+    expect(arrCopy(arr, 3)).toEqual([]);
+    expect(arrCopy(arr, 5)).toEqual([]);
+  });
+
+  it('should handle empty array', () => {
+    expect(arrCopy([])).toEqual([]);
+    expect(arrCopy([], 2)).toEqual([]);
+  });
+
+  it('should copy array of objects by reference', () => {
+    const obj1 = { a: 1 };
+    const obj2 = { b: 2 };
+    const arr = [obj1, obj2];
+    const result = arrCopy(arr);
+    expect(result).toEqual([obj1, obj2]);
+    expect(result[0]).toBe(obj1);
+    expect(result[1]).toBe(obj2);
+  });
+});