unit-testing - 如何对 React-Redux 连接的组件进行单元测试？

Question

我使用 Mocha、Chai、Karma、Sinon、Webpack 进行单元测试。

我点击此链接为 React-Redux 代码配置测试环境。

How to implement testing + code coverage on React with Karma, Babel, and Webpack

我可以成功测试我的操作和 reducer JavaScript 代码，但是当测试我的组件时它总是会抛出一些错误。

import React from 'react';
import TestUtils from 'react/lib/ReactTestUtils'; //I like using the Test Utils, but you can just use the DOM API instead.
import chai from 'chai';
// import sinon from 'sinon';
import spies from 'chai-spies';

chai.use(spies);

let should = chai.should()
  , expect = chai.expect;

import { PhoneVerification } from '../PhoneVerification';

let fakeStore = {
      'isFetching': false,
      'usernameSettings': {
        'errors': {},
        'username': 'sahil',
        'isEditable': false
      },
      'emailSettings': {
        'email': 'test@test.com',
        'isEmailVerified': false,
        'isEditable': false
      },
      'passwordSettings': {
        'errors': {},
        'password': 'showsomestarz',
        'isEditable': false
      },
      'phoneSettings': {
        'isEditable': false,
        'errors': {},
        'otp': null,
        'isOTPSent': false,
        'isOTPReSent': false,
        'isShowMissedCallNumber': false,
        'isShowMissedCallVerificationLink': false,
        'missedCallNumber': null,
        'timeLeftToVerify': null,
        '_verifiedNumber': null,
        'timers': [],
        'phone': '',
        'isPhoneVerified': false
      }
}

function setup () {
    console.log(PhoneVerification);
    // PhoneVerification.componentDidMount = chai.spy();
    let output = TestUtils.renderIntoDocument(<PhoneVerification {...fakeStore}/>);
    return {
        output
    }
}

describe('PhoneVerificationComponent', () => {
    it('should render properly', (done) => {
        const { output } = setup();
        expect(PhoneVerification.prototype.componentDidMount).to.have.been.called;
        done();
    })
});

上面的代码出现以下错误。

FAILED TESTS:
  PhoneVerificationComponent
    ✖ should render properly
      Chrome 48.0.2564 (Mac OS X 10.11.3)
    Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined.

尝试从 sinon spy 切换到 chai-spies。

我应该如何对我的 React-Redux 连接组件(智能组件)进行单元测试？

Answer 1

一种更漂亮的方法是导出普通组件和包含在 connect 中的组件。命名的导出将是组件，默认是包装的组件:

export class Sample extends Component {

    render() {
        let { verification } = this.props;
        return (
            <h3>This is my awesome component.</h3>
        );
    }

}

const select = (state) => {
    return {
        verification: state.verification
    }
}

export default connect(select)(Sample);

通过这种方式，您可以在应用中正常导入，但在测试时，您可以使用 import { Sample } from 'component' 导入命名导出。