你能写出期望抛出的异步测试吗？

Question

我正在编写一个异步测试，它期望异步函数抛出如下所示:

it("expects to have failed", async () => {
  let getBadResults = async () => {
    await failingAsyncTest()
  }
  expect(await getBadResults()).toThrow()
})

但jest只是不及格而不是通过测试:

 FAIL  src/failing-test.spec.js
  ● expects to have failed

    Failed: I should fail!

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expect(async () => {
  await failingAsyncTest()
}).toThrow()

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expect(function).toThrow(undefined)

Expected the function to throw an error.
But it didn't throw anything.

Answer 1

我想补充一下，您正在测试的函数必须抛出一个实际的错误对象 。如果您只是抛出一个类似 的表达式，Jest似乎无法识别。

Answer 2

您可以这样测试您的异步函数:

it('should test async errors', async () =>  {        
    await expect(failingAsyncTest())
    .rejects
    .toThrow('I should fail');
});

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