test(omit) : Add test cases for omit (#42)

src/object/omit.spec.ts

@@ -7,4 +7,23 @@ describe('omit', () => {
 
     expect(omit(object, ['foo', 'bar'])).toEqual({ baz: 3 });
   });
+
+  it('should return an empty object if all keys are omitted', () => {
+    const obj = { a: 1, b: 2, c: 3 };
+    const result = omit(obj, ['a', 'b', 'c']);
+    expect(result).toEqual({});
+  });
+
+  it('should return the same object if no keys are omitted', () => {
+    const obj = { a: 1, b: 2, c: 3 };
+    const result = omit(obj, []);
+    expect(result).toEqual({ a: 1, b: 2, c: 3 });
+  });
+
+  it('should not affect the original object', () => {
+    const obj = { a: 1, b: 2, c: 3 };
+    const result = omit(obj, ['b']);
+    expect(result).toEqual({ a: 1, c: 3 });
+    expect(obj).toEqual({ a: 1, b: 2, c: 3 });
+  });
 });