尝试测试组件时找不到模块“反应”

Question

我正在尝试向我的应用程序添加一些测试，但是当我安装react-testing-libraryand 时jest-dom，我编写了这个测试， test ifcomponentDidMount被调用：

import { render } from "react-testing-library";

import { QuestionContainer } from "../containers/QuestionContainer";

it("should call componentDidMount", () => {
  const cDM = jest.spyOn(QuestionContainer.prototype, "componentDidMount");

  render(QuestionContainer);

  expect(cDM).toHaveBeenCalled(1);
});

但我收到此错误：

Cannot find module 'react' from 'index.js'

However, Jest was able to find:
    '../containers/QuestionContainer.js'

You might want to include a file extension in your import, or update your 'moduleFileExtensions', which is currently ['web.js', 'js', 'web.ts', 'ts', 'web.tsx', 'tsx', 'json', 'web.jsx', 'jsx', 'node'].

我不认为文件扩展名有问题..

Answer 1

您需要react-test-renderer安装：

yarn add react-test-renderer// 或者将其添加到您的开发依赖项中！