Jest：在运行下一个测试之前等待异步测试完成

Question

假设我有这些测试用例（使用jest和supertest）：

describe('Test actors', async () => {
  const params = { /* ... */ }
  let actorId

  test(`Create an actor ${actorsUrl}`, async () => {
    const response = await request(app.callback())
      .post(actorsUrl)
      .send(params)
      .set('Accept', 'application/json')
      .set('Content-Type', 'application/json')
      .expect(200)
    expect(response.body.name).toBe(params.name)
    expect(response.body.address).toBe(params.address)
    actorId = response.body.id
  })

  test(`Get the actor created ${actorsUrl}/${actorsUrl}`, async () => {
    const response = await request(app.callback())
      .get(`${actorsUrl}/${actorsUrl}`)
      .set('Accept', 'application/json')
      .expect(200)
    expect(response.body.name).toBe(params.name)
    expect(response.body.address).toBe(params.address)
  })
})

我想在运行第二个测试之前等待第一个测试完成（因为第一个测试创建了一个Actor，第二个测试API要求创建的Actor）。运行此代码失败，因为尚未创建actor。

有没有办法在拨打第二个测试之前等待第一个测试完成？

Answer 1

jestjs只是jasmine的包装，在许多情况下它依赖于jasmine的规则。

因此，您可以使用传递给the same done callback函数的test：

test(`Create an actor ${actorsUrl}`, async (done) => {
    const response = await request(app.callback())
      .post(actorsUrl)
      .send(params)
      .set('Accept', 'application/json')
      .set('Content-Type', 'application/json')
      .expect(200)
    expect(response.body.name).toBe(params.name)
    expect(response.body.address).toBe(params.address)
    actorId = response.body.id
    done();
})
test(`Get the actor created ${actorsUrl}/${actorsUrl}`, async (done) => {
    const response = await request(app.callback())
      .get(`${actorsUrl}/${actorsUrl}`)
      .set('Accept', 'application/json')
      .expect(200)
    expect(response.body.name).toBe(params.name)
    expect(response.body.address).toBe(params.address)
    done();
})

你可以在jest的async documentation中阅读更多相关信息