React Native 测试 - 无需等待即可执行

下面的测试通过了，但我收到以下警告两次，我不知道为什么。有人可以帮我弄清楚吗？

    console.error
    Warning: You called act(async () => ...) without await. This could lead to unexpected testing behaviour, interleaving multiple act calls and mixing their scopes. You should - await act(async () => ...);
      at printWarning (../../node_modules/react-test-renderer/cjs/react-test-renderer.development.js:120:30)
      at error (../../node_modules/react-test-renderer/cjs/react-test-renderer.development.js:92:5)
      at ../../node_modules/react-test-renderer/cjs/react-test-renderer.development.js:14953:13
      at tryCallOne (../../node_modules/react-native/node_modules/promise/lib/core.js:37:12)
      at ../../node_modules/react-native/node_modules/promise/lib/core.js:123:15
      at flush (../../node_modules/asap/raw.js:50:29)

import { fireEvent } from '@testing-library/react-native'
import { renderScreen } from 'test/render'

describe('screens/home', () => {
  it('should render and redirect to the EventScreen', async () => {
    const {
      getByA11yLabel,
      findByA11yLabel,
      findAllByA11yLabel,
      toJSON
    } = renderScreen('Main')
    expect(toJSON()).toMatchSnapshot('Default render')

    const title = 'New event'
    const titleInput = getByA11yLabel('event.title')

    // Change title - sync fn
    fireEvent.changeText(titleInput, title)

    // Create button should be visible
    const createButton = await findByA11yLabel('event.create')
    expect(titleInput.props.value).toBe(title)
    expect(createButton).toBeTruthy()
    expect(toJSON()).toMatchSnapshot('Change title')

    // Create event - async fn
    fireEvent.press(createButton)

    // The app should be redirected to the EventScreen
    const titleInputs = await findAllByA11yLabel('event.title')
    const upsertButton = await findByA11yLabel('event.upsert')
    expect(toJSON()).toMatchSnapshot('Create event')
    expect(titleInputs).toHaveLength(2)
    expect(titleInputs[0].props.value).toBe('') // @MainScreen
    expect(titleInputs[1].props.value).toBe(title) // @EventScreen
    expect(upsertButton).toBeTruthy()
  })
})

• 据我所知，不需要包装fireEvent与act- link https://callstack.github.io/react-native-testing-library/docs/api/#act
• findBy*也自动包裹着act - link https://callstack.github.io/react-native-testing-library/docs/api-queries#findby
• Related GitHub 中的问题 https://github.com/callstack/react-native-testing-library/issues/379仍然开放

依赖项：

• 反应：16.13.1
• 世博会：39.0.4
• 笑话：26.6.3
• ts-笑话：26.4.4
• 玩笑博览会：39.0.0
• @testing-library/jest-native：3.4.3
• @测试库/反应：11.2.2
• @testing-library/react-native：7.1.0
• 反应测试渲染器：16.13.1
• 打字稿：4.1.2

如果您已用尽所有其他调试工作并且非常确定您的代码编写正确，那么它可能与react-native/jest-preset替换global.Promise带有模拟（参见issue https://github.com/facebook/react-native/issues/29303).

在这种情况下，问题的解决方案是覆盖/修补 jest 预设，以首先保存原始的全局 Promise，应用react-native/jest-preset然后恢复原来的Promise（覆盖模拟版本）。这让我可以使用await在与渲染无关的测试中，不会触发可怕的

console.error
Warning: You called act(async () => ...) without await. This could lead to unexpected testing behaviour, interleaving multiple act calls and mixing their scopes. You should - await act(async () => ...);

此代码片段显示了执行此补丁的一种方法：https://github.com/sbalay/without_await/commit/64a76486f31bdc41f5c240d28263285683755938 https://github.com/sbalay/without_await/commit/64a76486f31bdc41f5c240d28263285683755938