您好:)我开始使用 JEST和酶
学习单元测试在与 Reactjs 一起使用的我的“ Color Guessing Game”版本中(已完成), 但是当我开始测试我的Square Component时,我什至无法测试点击时的颜色状态值和颜色状态(clickSquare函数)...
我找不到有关它的大量资源,您能看到问题在哪里吗,以及如何测试方形部件?
Square.js组件:
import React, { Component } from 'react';
class Square extends Component {
constructor(props) {
super(props);
this.state = {
color: undefined
}
this.clickSquare = this.clickSquare.bind(this);
}
componentDidMount() {
if (this.props.color) {
this.setState({
color: this.props.color
})
}
};
componentWillReceiveProps(props) {
//results in the parent component to send updated props,,
//whenever the propositions are updated in the parent, runs this
//to update the son as well
this.setState({
color: props.color
})
}
clickSquare() {
if (this.state.color === this.props.correctColor) {
this.props.gameWon(true);
console.log('correct', this.state.color)
} else {
this.setState({
color: 'transparent'
})
// this.props.gameWon(false);
console.log('wrong')
}
};
render() {
return (
<div className='square square__elem'
style={{ backgroundColor: this.state.color }}
onClick={this.clickSquare}>
</div>
);
}
};
export default Square;
Square.test.js测试:
import React from 'react';
import Square from '../components/Square/Square';
import { shallow, mount } from 'enzyme';
describe('Square component', () => {
let wrapper;
beforeEach(() => wrapper = shallow(
<Square
color={undefined}
clickSquare={jest.fn()}
/>
));
it('should render correctly', () => expect(wrapper).toMatchSnapshot());
it('should render a <div />', () => {
expect(wrapper.find('div.square.square__elem').length).toEqual(1);
});
it('should render the value of color', () => {
wrapper.setProps({ color: undefined});
expect(wrapper.state()).toEqual('transparent');
});
});
期望值等于: “透明” 收到: {“颜色”:未定义}
Difference: Comparing two different types of values. Expected string but received object.
答案 0 :(得分:1)
嗯,您离解决方案不远。 :)
唯一的问题是表达式let select=$tag('select');
this.basePath=xpath.single("/html/body/div/div/div/div");
// - /html/body/div/div/div/div/div[2]/div/div[2]/div[2]/table/tbody/tr/th[2]/a
let fragment=document.createDocumentFragment();
let d=this.basePath.singleNodeValue.cloneNode(true);
fragment=fragment.appendChild(d);
if(select.length>0){
this.location=xpath.single("/div[2]/div/div[2]/div[2]/table/tbody/tr/th[2]/a",fragment);
console.log('location: '+this.location.singleNodeValue.textContent);
}
的括号之间没有传递任何参数-这就是为什么接收整个对象而不是单个值的原因。话虽如此,在这种情况下,您应该执行以下操作:
wrapper.state()
注意it('should render the value of color', () => {
wrapper.setProps({ color: undefined});
expect(wrapper.state('color')).toEqual('transparent');
});
的用法。
编辑
根据您在下面的评论,我没有意识到wrapper.state('color')
的值是通过click事件设置的。
这是应由Jest验证的完整测试套件:
transparent