Web19 aug. 2024 · Promises. If your code makes use promises, a simpler way to handle asynchronous tests exists. All you need to do is to return a promise from your test, and Jest waits for that promise to resolve. In the case where the promise is rejected, the test automatically fails. For instance, if fetchData, ... Web当你有以异步方式运行的代码时，Jest 需要知道当前它测试的代码是否已完成，然后它可以转移到另一个测试。 Jest有若干方法处理这种情况。 Promise . 为你的测试返回一 …

Error handling with promises - JavaScript

Web10 aug. 2024 · jest; const p = Promise => process => { console log; r; };; // await p; // this will hang jest 1; console.; await p; // this is fine console.log; In that context, the only dependable solution I know of is to have a Promise you can await on that's at the end of the chain. For example: Web11 feb. 2024 · You can wrap your promise function within expect and tell jest the function should reject with the given error. If the someOperation() somehow passes, jest will … middle school play script

Um Exemplo de Async · Jest

Webit('works with promises', () => { expect.assertions(1); return user.getUserName(4).then(data => expect(data).toBe('Mark')); }); Nós chamamos jest.mock ('../request') para informar Jest para usar nossa simulação manual. it espera que o valor de retorno seja uma promessa que vai ser resolvida. Web21 okt. 2024 · When using a callback with done(), it will trigger the jest/no-done-callback rule, but how can we use done.fail() when using Promises in beforeEach? In a similar question: #657 it was about tests, in which it was suggested to use throw new Error, but this doesn't work for beforeEach. middle school pick up lines