当包装在提供程序组件中时，如何使用Mocha + Enzyme + Chai测试反应本机组件 [英] How can I test react-native component with mocha + enzyme + chai when it's wrapped in a Provider component

问题描述

我正在使用 mocha，enzy，chai 和一些模拟库来使测试成为可能.因此， TestComponent.js 的内容如下，我配置了存储并将其传递给提供程序，而 DeskScreen 是连接的组件:

I'm using mocha, enzyme, chai and some mocking libraries to make the testing possible. So, the content of TestComponent.js is below, I configure the store and pass it to the provider, while DeskScreen is connected component:

import mockery from "mockery";
import 'babel-polyfill';
import reactNativeSvgMock from "react-native-svg-mock";
mockery.enable();
mockery.registerMock("react-native-svg", reactNativeSvgMock);
var DeskScreen = require( '../app/containers/DeskScreen/DeskScreen');
import React, {View, Text, StyleSheet} from 'react-native';
import {Provider} from 'react-redux';
import {shallow, render, mount} from 'enzyme';
import {expect} from 'chai';
import configureStore from 'redux-mock-store';
import reducer from "../app/reducers";
import Button from "../app/containers/Common/Button";
import ButtonWithNoFlex from "../app/containers/Common/ButtonWithNoFlex";
const mockStore = configureStore([]);

describe('<Test />', () => {
    it('it should render 1 view component', () => {
        const store = mockStore(reducer);
        var comp = shallow(
         <Provider store={store}>
            <DeskScreen/>
        </Provider>
    );
        expect(button).to.have.length(1);
        expect(comp.find(View)).to.have.length(1);
    });
});

运行命令npm test后，它将产生以下内容:

After running the command npm test it produces the following:

1) it should render 1 view component


  0 passing (1s)
  1 failing

  1) <Test /> it should render 1 view component:
     AssertionError: expected { Object (root, unrendered, ...) } to have a length of 1 but got 0
      at Context.<anonymous> (test/TestComponent.js:22:41)

也许原因是我使用了浅表而不是mount，但据我所知mount无法用于react-native.无论如何，我想以某种方式测试连接的组件.

Maybe the reason is I use the shallow instead of mount, but as I know mount is not available for react-native. Anyway, I'd like to test connected component somehow.

推荐答案

我认为有两种方法可以用来解决问题.

I think there are two ways to use solve the problem.

在组件文件中，将组件导出为命名导出，可以在测试中使用.

In your component file export the component as named export which you can use in your tests.

// Export the plain component as named component
export class MyComponent {
    // ...
}

export default connect(mapStateToProps)(MyComponent);

您的测试通过命名的import导入普通组件:

Your test import the plain compenent via named import:

import { MyComponent } from './MyComponent';

// Use it in your tests

2.通过shallow

提供上下文

如果您通过上下文提供商店，则可以使用连接的组件.这就是<Provider>的作用.

2. Provide context via shallow

You can use the connected component if you provide the store via context. This is what <Provider> does.

import { shallow } from 'enzyme';
import { createStore } from 'redux';

// reducer could be a real reducer or a mock fake reducer.
const store = createStore(reducer);

it('my test', () => {
    const wrapper = shallow(
        <MyComponent>,
        { context: { store } }
    );

    // test your component here
});

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