✅ Add test case for unmounting spin

components/spin/__tests__/delay.test.js

@@ -35,4 +35,13 @@ describe('delay spinning', () => {
         .hasClass('ant-spin-spinning'),
     ).toEqual(true);
   });
+
+  it('should cancel debounce function when unmount', async () => {
+    const wrapper = mount(<Spin spinning delay={100} />);
+    const spy = jest.spyOn(wrapper.instance().updateSpinning, 'cancel');
+    expect(wrapper.instance().updateSpinning.cancel).toEqual(expect.any(Function));
+    expect(spy).not.toHaveBeenCalled();
+    wrapper.unmount();
+    expect(spy).toHaveBeenCalled();
+  });
 });