使用 Material UI 工具提示测试组件时发出警告

act warning when testing component with Material UI Tooltip

这是 https://github.com/mui-org/material-ui/issues/15726#issuecomment-507293766

的跟进

我有一个组件 Registration,它有一个按钮,默认情况下是禁用的(通过单击复选框控制,接受条款和条件),如果悬停在上方,则显示工具提示消息,以接受条款和条件。以下是测试结果和测试本身。

√ without consent, cannot go further (190ms)

  console.error node_modules/react-dom/cjs/react-dom.development.js:506
    Warning: An update to ForwardRef(Popper) inside a test was not wrapped in act(...).        
    When testing, code that causes React state updates should be wrapped into act(...):
        act(() => {
      /* fire events that update state */
    });
    /* assert on the output */
        This ensures that you're testing the behavior the user would see in the browser. Learn more at ...
        in ForwardRef(Popper) (created by Tooltip)
        in Tooltip (created by WithStyles(Tooltip))
      ....

我的测试(使用@testing-library/react):


jest.useFakeTimers()
it('without consent, cannot go further', () => {
  const {getByText} = render(<Registration/>)
  const loginButton = getByText(/Log in/)
  act(() => {
    fireEvent.mouseEnter(loginButton)
    jest.runAllTimers()
  })
  expect(getByText(/Please accept our terms and conditions/)).toBeInTheDocument()
})

我按照 GitHub 问题上的建议添加了假计时器,但没有帮助。

不用担心行为警告。它会在下一版本的 React 中得到修复。有关详细信息,请参阅 here

我刚刚将我的项目从 React“16.8.6”更新为“16.9.0”,但控制台上仍然出现相同的错误...

更新: 要修复一些错误,我必须添加 act(() => { functionThatUpdateState(); })

对于其他错误,例如使用 Material Ui 工具提示时,我必须这样做:

beforeEach(() => {
   jest.useFakeTimers();
})

it("should do something", () => {
  act(() => {
     const { getByText } = render(<MyComponent />);
     jest.runAllTimers();
     expect(getByText("hey")).toBeDefined();
  })
});