我的顶级组件从children
获取react-router
,如下所示:
class App extends Component {
render() {
return (
<div>
{React.cloneElement(children, this.props.widgets)}
</div>
)
}
}
我正在尝试使用jest
编写一个简单的测试,如下所示:
it('renders without crashing', () => {
const div = document.createElement('div')
ReactDOM.render(<App />, div)
})
但是,此测试失败并出现以下错误:
FAIL src/App.test.js
● renders without crashing
TypeError: Cannot read property 'props' of undefined
at Object.<anonymous>.ReactElement.cloneElement (node_modules/react/lib/ReactElement.js:271:34)
at Object.cloneElement (node_modules/react/lib/ReactElementValidator.js:216:48)
at App.render (src/App.js:50:57)
at node_modules/react-dom/lib/ReactCompositeComponent.js:796:21
at measureLifeCyclePerf (node_modules/react-dom/lib/ReactCompositeComponent.js:75:12)
at ReactCompositeComponentWrapper._renderValidatedComponentWithoutOwnerOrContext (node_modules/react-dom/lib/ReactCompositeComponent.js:795:25)
at ReactCompositeComponentWrapper._renderValidatedComponent (node_modules/react-dom/lib/ReactCompositeComponent.js:822:32)
at ReactCompositeComponentWrapper.performInitialMount (node_modules/react-dom/lib/ReactCompositeComponent.js:362:30)
at ReactCompositeComponentWrapper.mountComponent (node_modules/react-dom/lib/ReactCompositeComponent.js:258:21)
at Object.mountComponent (node_modules/react-dom/lib/ReactReconciler.js:46:35)
at ReactCompositeComponentWrapper.performInitialMount (node_modules/react-dom/lib/ReactCompositeComponent.js:371:34)
at ReactCompositeComponentWrapper.mountComponent (node_modules/react-dom/lib/ReactCompositeComponent.js:258:21)
at Object.mountComponent (node_modules/react-dom/lib/ReactReconciler.js:46:35)
at mountComponentIntoNode (node_modules/react-dom/lib/ReactMount.js:104:32)
at ReactReconcileTransaction.perform (node_modules/react-dom/lib/Transaction.js:140:20)
at batchedMountComponentIntoNode (node_modules/react-dom/lib/ReactMount.js:126:15)
at ReactDefaultBatchingStrategyTransaction.perform (node_modules/react-dom/lib/Transaction.js:140:20)
at Object.batchedUpdates (node_modules/react-dom/lib/ReactDefaultBatchingStrategy.js:62:26)
有没有办法模仿cloneElement
?或者以忽略对cloneElement
?
答案 0 :(得分:0)
您的问题是children
未定义,因为没有路由器可以提供子组件。
通过创建测试子组件来修复它:
class TestComponent extends Component {
render() { return (<div className="test" />) }
}
it('renders without crashing', () => {
const div = document.createElement('div')
ReactDOM.render(<App><TestComponent /></App>, div)
})