test: cover legacy menu item element handle

Author: ZQDesigned

tests/Menu.spec.tsx

@@ -442,12 +442,13 @@ describe('Menu', () => {
       jest.runAllTimers();
     });
 
-    fireEvent.click(container.querySelector('.rc-menu-item'));
+    const firstItem = container.querySelector('.rc-menu-item') as HTMLLIElement;
+    fireEvent.click(firstItem);
     const info = handleClick.mock.calls[0][0];
-    const legacyItem = info.item as unknown as { props: { eventKey?: string } };
     expect(info.key).toBe('1');
-    expect(legacyItem).toBeTruthy();
-    expect(legacyItem.props.eventKey).toBe('1');
+    expect(info.item).toBeTruthy();
+    expect(info.item.props.eventKey).toBe('1');
+    expect(info.item.element).toBe(firstItem);
 
     expect(errorSpy).toHaveBeenCalledWith(
       'Warning: `info.item` is deprecated since we will move to function component that not provides React Node instance in future.',