typescript 你如何用笑话和酶测试路由器匹配参数？
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How do you test router match params with jest and enzyme?
提问by vanegeek
Say I have the following component which I grabbed from https://www.codeday.top/2017/11/08/56644.html. Here I am using match.params to access the id. How would I write a unit test for this component tests the presence of the h2 element using Jest+Enzyme+Typescript+React.
假设我有从https://www.codeday.top/2017/11/08/56644.html 获取的以下组件。在这里，我使用 match.params 来访问 id。我将如何为此组件编写单元测试以使用 Jest+Enzyme+Typescript+React 测试 h2 元素的存在。
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { Route, BrowserRouter as Router, Link, match } from 'react-router-dom';
// define React components for multiple pages
class Home extends React.Component<any, any> {
render() {
return (
<div>
<div>HOME</div>
<div><Link to='/details/id123'>Goto Details</Link></div>
</div>);
}
}
interface DetailParams {
id: string;
}
interface DetailsProps {
required: string;
match?: match<DetailParams>;
}
class Details extends React.Component<DetailsProps, any> {
render() {
const match = this.props.match;
if (match) {
return (
<div>
<h2>Details for {match.params.id}</h2>
<Link to='/'>Goto Home</Link>
</div>
);
} else {
return (
<div>
<div>Error Will Robinson</div>
<Link to='/'>Goto Home</Link>
</div>
)
}
}
}
ReactDOM.render(
<Router>
<div>
<Route exact path="/" component={Home} />
<Route exact path="/details/:id" component={(props) => <Details required="some string" {...props} />} />
</div>
</Router>
, document.getElementById('root')
);
回答by paibamboo
const wrapper = shallow(
<Details
required={true}
match={{params: {id: 1}, isExact: true, path: "", url: ""}}
/>
);
expect(wrapper.containsMatchingElement(<h2>Details for 1</h2>)).toBeTruthy();
回答by Steve Banton
Wrap All Tests In Context
在上下文中包装所有测试
Router exists in context, so you can wrap your tests in context and supply match params to it to test how your component picks them up.
路由器存在于上下文中，因此您可以将测试包装在上下文中并为其提供匹配参数以测试您的组件如何获取它们。
import { BrowserRouter } from 'react-router-dom';
import { shape } from 'prop-types';
import { mount } from 'enzyme';
// Instantiate router context
const router = route => ({
history: new BrowserRouter().history,
route,
});
const createContext = route => ({
context: { ...router(route) },
childContextTypes: { router: shape({}) },
});
export function mountWrap(node, route) {
return mount(node, createContext(route));
}
Example describe:
示例描述：
import React from 'react';
import { TableC } from '../../src/tablec';
import { mountWrap, shallowWrap } from '../testhelp/contextWrap';
import { expectedProps } from './mockdata'
describe('Table', () => {
let props;
let component;
let route = {
location: {},
match: {[MATCH OBJ HERE]}
}
const wrappedMount = () => mountWrap(<TableC {...props} />, route);
beforeEach(() => {
props = {
query: {
data: tableData,
refetch: jest.fn(),
},
};
if (component) component.unmount();
});
test('should call a DeepTable with correct props', () => {
let route = {
location: {},
match: {[UPDATE MATCH OBJ HERE BEFORE TEST]}
}
const wrapper = wrappedMount();
expect(wrapper.find('DeepTable').props()).toEqual(expectedProps);
});
});
This also allows you to optionally add other things to context, and allows the top level object in the wrapper to be your component (as opposed to wrapping with BrowserRouter or StaticRouter)
这也允许您有选择地向上下文添加其他内容，并允许包装器中的顶级对象成为您的组件（与使用 BrowserRouter 或 StaticRouter 包装相反）
