使用酶浅的react-router v4摩卡测试无法正常工作

时间:2019-11-12 15:02:50

标签: javascript react-router mocha enzyme

我有这个要进行单元测试的简单的React类组件。在实现react-router并将组件包装在withRouter中并开始使用Link之前,我很容易能够在Mocha测试期间使用酶的浅层函数来渲染组件。但是,情况不再如此,因为react-router的组件取决于上下文。

组件:

const React = require('react');
const { Link, withRouter } = require('react-router-dom');
const createReactClass = require('create-react-class');
const { Divider, Drawer, IconButton, MenuList, MenuItem, ListItem, ListItemText } = require('@material-ui/core');
const { ChevronLeft } = require('@material-ui/icons');

const h = React.createElement;

const DrawerMenu = createReactClass({
  renderMenuItems: function ({ actConfig, pathname }) {
    const chapterList = actConfig.chapterList;
    return (chapterList || []).map(chapter => {
      const path = `/${chapter.idName}`;
      return h(MenuItem, {
        key: chapter.idName,
        component: Link,
        to: path,
        selected: path === pathname
      },
      h(ListItemText, {}, chapter.title));
    });
  },

  render: function () {
    const { actConfig, open, location: { pathname } } = this.props;
    return (
      h(Drawer, { open },
        h('div', {},
          h(MenuList, {},
            h(ListItem, { key: 'header' },
              h(ListItemText, {}, actConfig.title),
              h(IconButton, { onClick: this.props.toggleDrawer },
                h(ChevronLeft, {}))),
            h(Divider, {}),
            this.renderMenuItems({ actConfig, pathname }))))
    );
  }
});

module.exports = withRouter(DrawerMenu);

测试:

const React = require('react');
const sinon = require('sinon');
const { MemoryRouter } = require('react-router');
const DrawerMenu = require('./drawerMenu');

const h = React.createElement;

describe('drawerMenu', function () {
  const props = {
    open: true,
    toggleDrawer: sinon.spy(),
    actConfig: {
      title: 'test act title',
      chapterList: [{ title: 'chapter 1', idName: 'some-id-1' }, { title: 'chapter 2', idName: 'some-id-2' }]
    }
  };

  it('render', function () {
    const w = shallow(
      h(MemoryRouter, {},
        h(DrawerMenu, props)));
    console.log(w.debug());
  });
});

我已经按照预期尝试将组件包装在MemoryRouter中,这确实有效果,但是它并没有呈现我习惯的样子。通常,在执行w.debug()时,我将获得组件及其所有子组件的完整html / jsx输出。请允许我执行非常方便的断言,例如w.find(SomeComponent).assert.something

我从console.log语句获得的输出:

<Router history={{...}}>
  <withRouter() open={true} toggleDrawer={[Function]} actConfig={{...}} />
</Router>

我一直在阅读here (Using MemoryRouter with enzyme shallow testing)并看着这个react-router-enzyme-context我已经尝试了两者,但是将第二个参数传递给shallow(h(DrawerMenu), context)似乎没有任何效果,输出就像没有它一样:

<ContextConsumer>
  [function]
</ContextConsumer>

我也尝试使用mount代替浅输入法,但是它根本不输出任何东西,最好还是使用浅输入法。

我觉得我有点接近,或者接近某个东西,只是错过了最后一块。

1 个答案:

答案 0 :(得分:0)

发现导入的包装组件具有属性WrappedComponent 这只是组件本身,然后才被withRouter()包裹。

以下内容用于测试组件的呈现:

const React = require('react');
const DrawerMenu = require('./drawerMenu').WrappedComponent;

const h = React.createElement;

describe('drawerMenu', function () {
  it('render', function () {
    const w = shallow(h(DrawerMenu, someProps));
    console.log(w.debug());
  });
});

输出:

<WithStyles(ForwardRef(Drawer)) open={true}>
  <div>
    <ForwardRef(MenuList)>
      <WithStyles(ForwardRef(ListItem))>
        <WithStyles(ForwardRef(ListItemText))>
          test act title
        </WithStyles(ForwardRef(ListItemText))>
        <WithStyles(ForwardRef(IconButton)) onClick={[Function]}>
          <ChevronLeftIcon />
        </WithStyles(ForwardRef(IconButton))>
      </WithStyles(ForwardRef(ListItem))>
      <WithStyles(ForwardRef(Divider)) />
      <WithStyles(ForwardRef(MenuItem)) component={{...}} to="/chapter1" selected={false}>
        .
        .
        .
      </ForwardRef(MenuList)>
    </ForwardRef(MenuList)>
  </div>
</WithStyles(ForwardRef(Drawer))>

但是请记住,用这种方法不可能测试布线,只能测试内部组件。