9

我试图对带有react-native-mock 的React Native 测试有一些基本的了解。

不包括在下面:mocha 的自定义编译器,以获得 babel 的好处。

我的代码如下:

Block.jsx

import React from 'react';
import {View} from 'react-native';

export default ({title, ui}) => (
  <View>
    Title: {title}
  </View>
);

Block.test.js

import { shallow } from 'enzyme';
import { expect } from 'chai';
import {Block} from '../';
import React from 'react';

describe('<Block /> with props: title', () => {

  it('should have correct props', () => {
    expect(
      shallow(<Block title="Something" />).props()
    ).to.deep.equal( {title:"Something"} );
  });

  it('should have correct title', () => {
    expect(
      shallow(<Block title="Something" />).text()
    ).to.equal( "Something" );
  });

});

试验结果

摩卡命令:

mocha --compilers js:./test/support/compiler.js --require react-native-mock/mock --recursive **/test/*.test.js --watch

摩卡测试结果:

  <Block /> with props: title
    1) should have correct props
    2) should have correct title

  2 failing

  1) <Block /> with props: title should have correct props <Text />:

      AssertionError: expected { Object (children) } to equal { title: 'Something' }
      + expected - actual

       {
      -  "children": [
      -    "Title: "
      -    "Something"
      -  ]
      +  "title": "Something"
       }

      at Context.<anonymous> (components/test/Block.test.js:24:120)

  2) <Block /> with props: title should have correct title <Text />:

      AssertionError: expected '<View />' to equal 'Something'
      + expected - actual

      -<View />
      +Something

      at Context.<anonymous> (components/test/Block.test.js:28:119)

意外行为

  1. props()似乎获得了正确的值,但格式与 api 描述的格式不同
  2. text()不呈现节点textContent,而是呈现字符串化标签“ <View />

替代方案:props().children

给定组件:

import React from 'react';
import {View, Text} from 'react-native';

export default ({title, ui}) => (
  <View>
    <Text> The title...</Text>
    {title}
  </View>
);

props().children是数组[<Text component instance>, "Something"]

所以下面的测试通过了:

  it('should have correct props', () => {
    expect(
      shallow(<Block title="Something" />).props().children
    ).to.contain( "Something" );
  });

问题

为什么酶 API 的行为与文档中描述的不同?

具体查看文档应该shallow(<Block title="Something" />).text()等于:The title...Something

我做错了什么,还是我正在使用的技术之一?

编辑1:其他问题

html(), render(),update()似乎也不适用于我的设置

编辑:React Native 目前仅适用shallow

4

4 回答 4

7

解决方案1:解决方案textContent

从酶示例应用程序:

const title = "Blah";
const wrapper = shallow(<Block title={title} />);
expect(wrapper.length).to.equal(1);
expect(wrapper.contains(<Text>{title}</Text>)).to.equal(true);

解决方案 2:更多语义

好的,上面的Alternative: props().children更语义化的版本如下。这个Github 讨论也有帮助。

Block.js

import React from 'react';
import {View, Text} from 'react-native';

export default ({title, ui}) => (
  <View>
    <Text data={title}>{title}</Text>
  </View>
);

Block.test.js

  it('should have correct props', () => {
    const title = title;
    expect(
      shallow(<Block title={title} />)
         .find('Text') // Use selector to get certain children
         .first() // Get the first child
         .props() // Get its props
         .data
    ).to.equal(title)
  });
于 2016-12-29T08:36:34.333 回答
4
  1. 您可以参考您要测试的特定道具:

    expect( shallow(<Block title="Something" />).prop('title') ).to.equal( "Something" );

  2. text()没有按照您的想法进行操作。看看文档中的第二个例子,浅层不会渲染你的<View>标签

于 2016-06-08T18:58:47.900 回答
2

另一种解决方案(与 非常相似props().children)是访问 props 中的子项

  it('should have correct props', () => {
    expect(
      shallow(<Block title="Something" />).prop('children')
    ).toBe( "Something" );
  });
于 2018-11-22T17:00:49.127 回答
1

你可以expect(wrapper.find(Foo).render().text()).to.equal('Hello World')把戏

于 2020-06-02T14:43:45.733 回答