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javascript - 使用 Jest 在自定义 Ajax 函数中模拟响应值

转载 作者:行者123 更新时间:2023-11-28 21:15:26 25 4
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我们用自定义 ajax 函数替换了 axios 以避免 IE11 不支持的 Promises 和任何功能。

/* _utility.js */

export const ajaxGet = ( config ) => {
const httpRequest = new XMLHttpRequest();
const defaultConfig = Object.assign( {
url: '',
contentType: 'application/json',
success: ( response ) => {},
}, config );

httpRequest.onreadystatechange = function() {
if ( httpRequest.readyState === XMLHttpRequest.DONE ) {
if ( httpRequest.status >= 200 && httpRequest.status < 300 ) {
defaultConfig.success( JSON.parse( httpRequest.responseText ) );
}
}
};

httpRequest.open( 'GET', defaultConfig.url, true );
httpRequest.send();
};

这在 React JS 中的使用方式如下:

/* AggregationPageContent */

export class AggregationPageContent extends React.Component {
constructor() {
super();
this.state = {
data: false,
};
}

componentDidMount() {
const { restUrl, termId } = tlsAggregationPage;

ajaxGet( {
url: `${ restUrl }/category/${ termId }?page=${ this.state.page }`,
success: ( response ) => {
this.setState( {
data: response,
page: 1,
}
},
} );
}
}

在使用 axios 时,响应是这样模拟的:

/* AggregationPage.test.js */

import { aggregationData } from '../../../stories/aggregation-page-data-source';

jest.mock( 'axios' );

test( 'Aggregation page loads all components.', async () => {
global.tlsAggregationPage = {
id: 123,
resultUrl: 'test',
};

axios.get.mockResolvedValue( { data: aggregationData } );

我试图模拟 ajaxGet 的响应,但我已经走到了死胡同。我如何模拟传递给 defaultConfig.success( JSON.parse( httpRequest.responseText ) ); 的值?

最佳答案

这是单元测试解决方案:

_utility.js:

export const ajaxGet = (config) => {
const httpRequest = new XMLHttpRequest();
const defaultConfig = Object.assign(
{
url: '',
contentType: 'application/json',
success: (response) => {},
},
config,
);

httpRequest.onreadystatechange = function() {
if (httpRequest.readyState === XMLHttpRequest.DONE) {
if (httpRequest.status >= 200 && httpRequest.status < 300) {
defaultConfig.success(JSON.parse(httpRequest.responseText));
}
}
};

httpRequest.open('GET', defaultConfig.url, true);
httpRequest.send();
};

AggregationPageContent.jsx:

import React from 'react';
import { ajaxGet } from './_utility';

const tlsAggregationPage = { restUrl: 'https://example.com', termId: '1' };

export class AggregationPageContent extends React.Component {
constructor() {
super();
this.state = {
data: false,
page: 0,
};
}

componentDidMount() {
const { restUrl, termId } = tlsAggregationPage;

ajaxGet({
url: `${restUrl}/category/${termId}?page=${this.state.page}`,
success: (response) => {
this.setState({
data: response,
page: 1,
});
},
});
}

render() {
return null;
}
}

AggregationPage.test.jsx:

import { AggregationPageContent } from './AggregationPageContent';
import { ajaxGet } from './_utility';
import { shallow } from 'enzyme';

jest.mock('./_utility.js', () => {
return {
ajaxGet: jest.fn(),
};
});

describe('AggregationPageContent', () => {
afterEach(() => {
jest.resetAllMocks();
});
it('should pass', () => {
let successCallback;
ajaxGet.mockImplementationOnce(({ url, success }) => {
successCallback = success;
});
const wrapper = shallow(<AggregationPageContent></AggregationPageContent>);
expect(wrapper.exists()).toBeTruthy();
const mResponse = [];
successCallback(mResponse);
expect(wrapper.state()).toEqual({ data: [], page: 1 });
expect(ajaxGet).toBeCalledWith({ url: 'https://example.com/category/1?page=0', success: successCallback });
});
});

100% 覆盖率的单元测试结果:

 PASS  src/stackoverflow/59299691/AggregationPage.test.jsx (13.603s)
AggregationPageContent
✓ should pass (13ms)

----------------------------|----------|----------|----------|----------|-------------------|
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
----------------------------|----------|----------|----------|----------|-------------------|
All files | 100 | 100 | 100 | 100 | |
AggregationPageContent.jsx | 100 | 100 | 100 | 100 | |
----------------------------|----------|----------|----------|----------|-------------------|
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 15.403s

源代码:https://github.com/mrdulin/jest-codelab/tree/master/src/stackoverflow/59299691

关于javascript - 使用 Jest 在自定义 Ajax 函数中模拟响应值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59299691/

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