Jest 期望异常不适用于异步

Question

我正在编写一个应该可以捕获异常的测试

describe('unauthorized', () => {
  const client = jayson.Client.http({
    host: 'localhost',
    port: PORT,
    path: '/bots/uuid',
  })

  it('should return unauthorized response', async () => {
    const t = async () => {
      await client.request('listUsers', {})
    }

    expect(t()).toThrow(Error)
  })
})

我很确定这client.request会引发异常，但 Jest 说：

收到的函数没有抛出

const test = async () => {
 ...
}

检查方法是否正确？

更新

如果我改为

expect(t()).toThrow(Error)

我有

expect(received).toThrow(expected)

Matcher error: received value must be a function

Received has type:  object
Received has value: {}

Answer 1

您可以使用拒绝

 it('should return unauthorized response', async () => {
    await expect(client.request('listUsers', {})).rejects.toThrow(/* error you are expecting*/);
 })

或者

您可以使用 try/catch

 it('should return unauthorized response', async () => {
    const err= null;
    try {
      await client.request('listUsers', {});
    } catch(error) {
      err= error; //--> if async fn fails the line will be executed
    }

    expect(err).toBe(/* data you are expecting */)
  })

您可以检查错误type of和error message