在 React 组件中测试方法的正确方法是什么,在本例中为 componentDidMount。我想测试组件内部的 setTimeOut 函数。我应该使用 stub 吗?例如下面的代码:
componentDidMount() {
setTimeout(() => this.setState({ isOpen: true }), 1);
}
如何测试正在调用的 setTimeout?
我尝试了以下方法,但没有用。我错过了什么?
my imports:
import test from 'ava';
import React from 'react';
import { ad } from 'components/Ad/Ad';
import { shallow, mount } from 'enzyme';
import { stub } from 'sinon';
import { expect } from 'chai';
import sinon from 'sinon';
let info;
test.beforeEach(() => {
info = shallow(<ad {...props} />)
});
test('is active: true after mounting', done => {
info.instance().componentDidMount()
setTimeout(() => {
info.state('active').should.be.true <--line:42
done()
}, 0)
})
我收到以下错误: 类型错误:无法读取未定义的属性“be” null._onTimeout (test/Components/Ad.unit.js:42:5)
最佳答案
这是一个使用 mocha、chai 和 enzyme 的示例:
组件:
import React, {PropTypes as T} from 'react'
import classnames from 'classnames'
export default class FadeIn extends React.Component {
constructor(...args) {
super(...args)
this.state = {active: false}
}
componentDidMount() {
setTimeout(() => this.setState({active: true}), 0)
}
render() {
const {active} = this.state
return (
<div className={classnames('fade-in', {active}, this.props.className)}>
{this.props.children}
</div>
)
}
}
FadeIn.propTypes = {
className: T.string
}
FadeIn.displayName = 'FadeIn'
测试:
import React from 'react'
import {shallow} from 'enzyme'
import FadeIn from '../../src/components/FadeIn'
describe('FadeIn', () => {
let component
beforeEach(() => {
component = shallow(<FadeIn/>)
})
it('is initially active: false', () => {
component.state('active').should.be.false
component.find('div.fade-in').prop('className').should.equal('fade-in')
})
it('is active: true after mounting', done => {
component.instance().componentDidMount()
setTimeout(() => {
component.state('active').should.be.true
component.find('div.fade-in').prop('className').should.equal('fade-in active')
done()
}, 0)
})
})
关于javascript - react 测试。如何测试 react 组件内部的功能,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41745415/