我正在写一个async测试,期望async函数抛出像这样:

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

但玩笑只是失败而不是通过测试:

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

    Failed: I should fail!

如果我重写这个测试,看起来像这样:

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

我得到这个错误,而不是通过测试:

expect(function).toThrow(undefined)

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

当前回答

我想在此基础上补充一点,说明您正在测试的函数必须抛出一个实际的Error对象抛出新的Error(…)。Jest似乎不能识别你是否抛出了一个像throw ' an error occurred!'这样的表达式。

其他回答

为了能够创建许多测试条件,而不必每次都解析承诺,这也可以工作:

it('throws an error when it is not possible to create an user', async () => {
        const throwingFunction = () => createUser(createUserPayload)

        // This is what prevents the test to succeed when the promise is resolved and not rejected
        expect.assertions(3)

        await throwingFunction().catch(error => {
            expect(error).toBeInstanceOf(Error)
            expect(error.message).toMatch(new RegExp('Could not create user'))
            expect(error).toMatchObject({
                details: new RegExp('Invalid payload provided'),
            })
        })
    })

我想在此基础上补充一点,说明您正在测试的函数必须抛出一个实际的Error对象抛出新的Error(…)。Jest似乎不能识别你是否抛出了一个像throw ' an error occurred!'这样的表达式。

test("它应该在云函数调用失败时测试async ", async () => { failingCloudFunction (params)。Catch (e => { 期望(e.message)。托比(无效的类型) }) });

这对我很有效

it("expects to have failed", async () => {
  let getBadResults = async () => {
    await failingAsyncTest()
  }
  expect(getBadResults()).reject.toMatch('foo')
  // or in my case
  expect(getBadResults()).reject.toMatchObject({ message: 'foo' })
})

你可以这样测试你的async函数:

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

'I should fail'字符串将匹配抛出的错误的任何部分。