How to test a function that changes state?

Question

Unit testing

const [test, setTest] = useState(5);

  const handleClick = () => {
    setTest(6));
  };
<Button onClick={handleClick}>
            test
 </Button>


сам тест:
test('handleClick', () => {
    const button = rrr.root.findAllByType(Button)[1];
    const mockRenderCustomItem = jest.fn(() => 1);

    expect(button.props.onClick()).toEqual(mockRenderCustomItem);
  });

how to call a function from onClick? now comes just Received: undefined