用 jest enzyme 测试 react router v4

Question

我正在尝试使用 react router v4 和 jest enzyme 进行简单测试。

describe('<App />', () => {

  it('renders a static text', () => {

    const wrapper = shallow(
    <MemoryRouter initialEntries={['/']} initialIndex={0}>
      <App/>
    </MemoryRouter>

    console.log(wrapper.html());
  );

  });
});

当我尝试 console.log(wrapper.html()) 时，我得到：

Invariant Violation: [React Intl] Could not find required `intl` object. <IntlProvider> needs to exist in the component ancestry.

我正在使用 react-boiler-plate 项目。我想要做的就是测试当我给它一个路径 '/' 时主页会呈现一些文本。

感谢任何帮助！谢谢！

编辑:

这是测试：

it('test', () => {
    const wrapper = shallow(
      <MemoryRouter initialEntries={['/']} initialIndex={0}>
        <Route path="/" render={() => <App/>}/>
      </MemoryRouter>,
    );

    console.log(wrapper.find(App).html());
  });

这是应用 class:

export default function App() {
  return (
    <AppWrapper>
      <Helmet
        titleTemplate="%s - React.js Boilerplate"
        defaultTitle="React.js Boilerplate"
      >
        <meta name="description" content="A React.js Boilerplate application"/>
      </Helmet>
      <Header/>
      <Switch>
        <Route exact path="/" component={HomePage}/>
        <Route path="/features" component={FeaturePage}/>
        <Route
          path="/catalog"
          render={() => <div>hi</div>}
        />
        <Route path="" component={NotFoundPage}/>
      </Switch>
      <Footer/>
    </AppWrapper>
  );
}

这是运行测试时的错误信息：

**Error: Method “html” is only meant to be run on a single node. 0 found instead.**

我希望这个页面能够匹配并且我能够console.log它的输出：

<Route exact path="/" component={HomePage}/>

Answer 1

为什么要在 shallow 中调用 console.log？我以前从没见过这个... 尝试将 <App /> 组件包装在 <Route /> 中，并在其中搜索一些标签。例如。假设您有这个简单的组件：

<App>
  <h1>Hi there!</h1>
</App>

测试看起来像这样：

describe('<App />', () => {

  it('renders a static text', () => {

    const wrapper = shallow(
      <MemoryRouter initialEntries={['/']} initialIndex={0}>
        <Route path="/" render={() => <App />} />
      </MemoryRouter>
    );
    console.log(wrapper.find(App).html());
  });
});

更新碰巧 react-boilerplate 添加了太多包装器和依赖项。因此，为了成功测试，我们需要以不同的方式克服它们...

我就是这样完成的（我的 react-boilerplate/app/tests/simple.test.js 的全部内容）：

import React from 'react';
import { mount } from 'enzyme';
import { MemoryRouter, Route, browserHistory } from 'react-router-dom';
import { IntlProvider } from 'react-intl';
import { Provider } from 'react-redux';

import configureStore from '../configureStore';
import App from '../containers/App';
import { HomePage } from '../containers/HomePage';

describe('test of initial load', () => {
  it('test', () => {
    const store = configureStore({}, browserHistory);
    const wrapper = mount(
      <MemoryRouter initialEntries={['/']} initialIndex={0}>
        <IntlProvider locale="en"> // to add Intl support
          <Provider store={store} > // to provide store for numeric connected components
            <Route path="/" render={() => <App />} />
          </Provider>
        </IntlProvider>
      </MemoryRouter>
    );
    process.nextTick(() => { // to wait for loadible component will be imported
      console.log(wrapper.find(HomePage).html());
    });
  });
});

我认为这是集成而不是单元测试... console.log 的输出：

    console.log app/tests/simple.test.js:24
  <article><!-- react-empty: 38 --><div><section class="sc-bxivhb jwizic"><h2 class="H2__H2-dhGylN kpbCLA"><span>Start your next react project in seconds</span></h2><p><span>A highly scalable, offline-first foundation with the best DX and a focus on performance and best practices</span></p></section><section class="Section__Section-jEbZoY eivjmS"><h2 class="H2__H2-dhGylN kpbCLA"><span>Try me!</span></h2><form class="Form__Form-PASBS cEpjmP"><label for="username"><span>Show Github repositories by</span><span class="AtPrefix__AtPrefix-ivHByA dZcxpA"><span>@</span></span><input type="text" class="Input__Input-ixjKAz jCPlXI" id="username" placeholder="mxstbr" value=""></label></form><!-- react-empty: 54 --></section></div></article>

Answer 2

无需所有 <MemoryRouter> 或 <Route> 标签即可执行此操作的超级简单方法

在您的 App 组件中，将 export 添加到您的 class。

export class App extends Component {
  render() {
    return (
      <div>Hi, there</div>
    );
  }
}

然后在您的 spec.js 文件中，只需导入要测试的组件，如下所示：

import React from 'react'; 
import {shallow} from 'enzyme'; 
import { App } from './App';

describe ('App component', () => {

  it('renders App', () => {
     const wrapper = shallow(<App optInValue={true} authenticated={true}/>);

     expect(wrapper.length).toEqual(1);   
  }); 
});

用 jest enzyme 测试 react router v4

Testing react router v4 with jest enzyme

testing

router

reactjs

jestjs

react-router