当我运行测试时，得到“不变违反:本机模块不能为空". [英] Getting ''Invariant Violation: Native module cannot be null.'' when i run the test

问题描述

我下面有一个Login组件，我正在为该组件编写一些测试用例.当我尝试运行测试时，出现以下错误.

I have a Login component as bellow and i am writing some test cases for the component . When I try to run the test i got the following error .

测试

import renderer from 'react-test-renderer'

import Login from '../Login'
let props, wrapper

beforeEach(() => {
  props = {
    loginAttempt: jest.fn(),
    recoverAttempt: jest.fn(),
    reset: jest.fn()
  }
  wrapper = shallow(<Login {...props} />)
})

describe('tests for <Login />', () => {
  test('should have a formProvider with handlesubmit atribute', () => {
    const value = wrapper.find('FormProvider')
    expect(value.length).toBe(1)
  })
})

//Snapshot test
test('Snapshot test for the Contact form', () => {
  const tree = renderer.create(<Login {...props} />).toJSON()
  expect(tree).toMatchSnapshot()
})

组件

import React, { Component } from 'react'
import KeyboardAvoidingWrapper from 'components/Wrappers/KeyboardAvoidingWrapper'

export default class AuthScreen extends Component {
  state = {

  }

  toggleRecovery = e => {

    )
  }

  loginAttempt = data => {

  }

  recoverAttempt = data => {

  }

  componentWillUnmount() {

  }

  render() {
    let { loginAttempt, toggleRecovery, recoverAttempt, state, props } = this
    let { recovery } = state
    let { error, fetching } = props
    return (
      <KeyboardAvoidingWrapper enabled={false} behavior="padding" fluid>

    UI GOES HERE..

      </KeyboardAvoidingWrapper>
    )
  }
}

错误

  ● Test suite failed to run

    Invariant Violation: Native module cannot be null.

      at invariant (node_modules/react-native/node_modules/fbjs/lib/invariant.js:40:15)
      at new NativeEventEmitter (node_modules/react-native/Libraries/EventEmitter/NativeEventEmitter.js:36:36)
      at Object.<anonymous> (node_modules/react-native-safari-view/SafariViewManager.ios.js:12:20)
      at Object.<anonymous> (node_modules/react-native-safari-view/index.js:1:238)

为什么我遇到此错误.是因为该组件未正确导入.我不知道为什么会这样，我怎么解决这个问题.

Why i am getting this error . Is it because the component do not get import correctly . I could not figure out the why this happening how can i resolve this issue .

谢谢

推荐答案

当您在渲染树中导入本机组件时会发生此问题，因为测试渲染器没有它们.要解决此问题，您要么需要模拟组件( https://jestjs.io/docs/zh_/manual-mocks )，或使用浅层渲染( https://reactjs. org/docs/shallow-renderer.html )

This problem happens when you import a native component in the render tree, as the test renderer do not have them. To fix this, either you need to mock the component (https://jestjs.io/docs/en/manual-mocks), or use shallow rendering (https://reactjs.org/docs/shallow-renderer.html)

对于您的特殊情况，这是可以帮助您的github问题: https://github.com/naoufal/react-native-safari-view/issues/99

For your particular case, this is the github issue to help you: https://github.com/naoufal/react-native-safari-view/issues/99

另一种解决方案可以使用 react-native-mock-render 模块( react-native-mock 的最活跃的分支)

Another solution could be using react-native-mock-render module (the most active fork of react-native-mock)

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