如何使用 moxios 进行反应测试以在测试的 运行 之前更新 DOM

How to get react test using moxios to update the DOM before running later part of the test

我正在尝试使用 jest 和 react-testing-library 为组件编写测试。测试需要等待 useEffect 在 axios 请求后更新状态。我正在使用 moxios 来模拟 api 调用,但我无法让测试等待 moxios 到 return,然后它会触发再次向 [=27 发送删除请求的点击事件处理程序=].测试失败表明我尝试单击的 DOM 元素尚不存在,因为它仅在 useEffect 请求更新后生成。

我试过使用 flushEffect 等待,我也试过将点击包装在初始 moxios 请求中,但两者都不起作用

我删除了所有不相关的代码。

这是组件。加载后,它会向 api 发送获取请求,以获取对某些好处的 json 响应。 BenefitsTable 组件接收收益,并为每个收益生成一个 table,其中包括一个删除按钮。我试图先加载福利,然后单击删除按钮。加载前不存在删除按钮。

const Benefits = props => {
  const [benefits, setBenefits] = useState([])
  const [editing, setEditing] = useState(false)
  const [editingBenefit, setEditingBenefit] = useState({id: null, name: '', category: ''})

  useEffect(() => {
    axios.get('/api/v1/benefits')
      .then(response => {
        setBenefits(response.data)
      })
  }, [])

  const deleteBenefit = benefit => {
    const id = benefit.id
    axios.delete(`/api/v1/benefits/${id}`)
      .then(response => {
        setBenefits(benefits.filter(benefit => benefit.id !== id))
        warning('Benefit Deleted')
      })
      .catch(error => {
        warning('Benefit could not be deleted. Please try again')
      })
  }

  return(
     <div>
       <Section>
         <BenefitsTable
            benefits={benefits} 
            deleteBenefit={deleteBenefit}
            editBenefit={editBenefit}
          />
       </Section>
     </div>
  )
}

我的测试如下:

it('deletes a benefit when the delete button is clicked', () => {
  const { getByTestId } = render(<Benefits />)
    moxios.wait(() => {
      const request = moxios.requests.mostRecent()
      request.respondWith({
        status: 200,
        response: benefits
      }).then(() => {
        done()
      })
    })
    fireEvent.click(getByTestId('deleteButton1'))
    moxios.wait(() => {
      const request = moxios.requests.mostRecent()
      request.respondWith({
       status: 200,
    }).then(() => {
      expect(document.querySelectorAll('tbody > tr').length).toBe(1)
      done()
    })
  })
})

输出是Unable to find an element by: [data-testid="deleteButton1"],我知道这是因为 axios 请求是异步的,但我尝试将 fireevent 和后续的 axios 请求包装在第一个 axios 请求的 then 子句中,虽然测试通过,它通过任何值意味着它没有被正确处理。

等待元素出现是否可行?

it('deletes a benefit when the delete button is clicked', async () => {
  const { getByTestId } = render(<Benefits />)
    moxios.wait(() => {
      const request = moxios.requests.mostRecent()
      request.respondWith({
        status: 200,
        response: benefits
      })
    })
    await waitForElement(getByTestId('deleteButton1'))
    fireEvent.click(getByTestId('deleteButton1'))
    moxios.wait(() => {
      const request = moxios.requests.mostRecent()
      request.respondWith({
       status: 200,
    }).then(() => {
      expect(document.querySelectorAll('tbody > tr').length).toBe(1)
      done()
    })
  })
})