javascript - Jest : Wait for an async test to finish before running the next one

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 而第二个测试向 API 请求创建的 Actor ).运行此代码失败，因为尚未创建参与者。

有没有办法在调用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，并且在许多情况下它依赖于 jasmine 的规则。

因此，您可以利用 the same done callback传递给 test 函数:

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();
})

您可以在 jest 的 async documentation 中阅读更多相关信息