酶/笑话中的setTimeout [英] setTimeout in enzyme/jest
问题描述
我试图了解异步测试如何在酶中起作用.
I am trying to understand how asynchronous testing works in enzyme.
我的View.tsx组件在一定的超时后呈现.(在我的情况下,超时确保动画完全完成时).在我的测试中,我尝试挂载父组件,并尝试编写测试:子组件"ViewContent"是否为子组件"ViewContent"?被渲染.
my View.tsx component renders after certain timeout.(timeout ensures in my case when animation is fully finished). In my test i tried to mount the parent component and was trying to write a test: is child component "ViewContent" was rendered.
我不确定如何为我的组件编写setTimeout测试.View.tsx
I am not sure how to write test for setTimeout for my component. View.tsx
const View = (props: Props) => {
const [isAnimationFinished, doFinishAnimation] = React.useState(false);
const onLoad = (ev: AnimationEvent) => {
setTimeout(() => doFinishAnimation(true), 50);
};
useEventListener("animationend", onLoad);
return (
<ScrollArea
className="anim__movein__line"
>
{isAnimationFinished && (
<>
<ViewContent />
</>
)}
</ScrollArea>
);
};
eventListener
eventListener
import { useRef, useEffect } from "react";
export function useEventListener(
eventName: string,
handler: (ev?: any) => void
) {
const savedHandler = useRef(null);
useEffect(
() => {
savedHandler.current = handler;
},
[handler]
);
useEffect(
() => {
const eventListener = event => savedHandler.current(event);
document.addEventListener(eventName, eventListener);
return () => {
document.removeEventListener(eventName, eventListener);
};
},
[eventName]
);
}
测试
import * as React from "react";
import * as Enzyme from "enzyme";
function CodeWarpper() {
let component = React.createElement(App);
let wrapper = Enzyme.mount(component);
let findView = wrapper.find(React.createElement(ViewContent));
Given(/^View '(.+)' becomes available$/, function () {
setTimeout(() => {
console.log(findView.debug())
}, 60); //here nothing is shown
return ( expect(findView).to.be.true);
});
}
推荐答案
不要忘记配置笑话,因为默认超时为5秒( 5000毫秒
).做下一件事:
Don't forget to configure jest since default timeout is 5 seconds (5000 milliseconds
). Do the next thing:
// jest.config.js
module.exports = {
// setupTestFrameworkScriptFile has been deprecated in
// favor of setupFilesAfterEnv in jest 24
setupFilesAfterEnv: ['./jest.setup.js']
}
// jest.setup.js
jest.setTimeout(60000) // 1 minute
P.S.您可以根据需要设置超时.
P.S. You can set timeout as much as you want.
这篇关于酶/笑话中的setTimeout的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!