render()
方法中的标准if/else
语句执行此操作。 boolean
,用于跟踪是否要在UI中显示某个元素。该button
切换此值的状态。目前,它每次都呈现相同的UI。使用if/else
语句重写render()
方法,以便如果display
为true
,则返回当前标记。否则,返回没有h1
元素的标记。 注意:您必须编写if/else
以传递测试。使用三元运算符不会通过此处。 MyComponent
应该存在并呈现。
testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); return mockedComponent.find("MyComponent").length === 1; })(), "MyComponent
should exist and render.");'
- text: 当display
设置为true
,应该渲染div
, button
和h1
。
testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const state_1 = () => { mockedComponent.setState({display: true}); return waitForIt(() => mockedComponent )}; const updated = await state_1(); assert(mockedComponent.find("div").length === 1 && mockedComponent.find("div").children().length === 2 && mockedComponent.find("button").length === 1 && mockedComponent.find("h1").length === 1, "When display
is set to true
, a div
, button
, and h1
should render."); }; '
- text: 当display
设置为false
,只应呈现div
和button
。
testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyComponent)); const state_1 = () => { mockedComponent.setState({display: false}); return waitForIt(() => mockedComponent )}; const updated = await state_1(); assert(mockedComponent.find("div").length === 1 && mockedComponent.find("div").children().length === 1 && mockedComponent.find("button").length === 1 && mockedComponent.find("h1").length === 0, "When display
is set to false
, only a div
and button
should render."); }; '
- text: render方法应使用if/else
语句来检查this.state.display
的条件。
testString: 'getUserInput => assert(getUserInput("index").includes("if") && getUserInput("index").includes("else"), "The render method should use an if/else
statement to check the condition of this.state.display
.");'
```