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axios请求后使用useEffect更新状态。我正在使用moxios来模拟api调用,但是我无法通过测试来等待moxios返回,然后它会触发单击事件处理程序,该事件再次将删除请求发送到api。该测试未能说出我要单击的DOM元素尚不存在,因为它仅在useEffect请求更新后才产生。
我尝试使用flushEffect等待,并且还尝试将点击包装在初始moxios请求中,但都无法正常工作
我已经删除了所有不相关的代码。
这是组件。加载后,它将向api发送一个get请求,以获取一些好处的json响应。 BenefitsTable组件获取收益,并为每个收益生成一个包含删除按钮的表。我正在尝试先加载好处,然后单击删除按钮。在加载之前没有删除按钮。
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()
})
})
})
输出为Unable to find an element by: [data-testid="deleteButton1"]
,我知道这是因为axios请求是异步的,但是我尝试将fireevent和后续axios请求包装在第一个axios请求的then子句中,尽管测试通过了,它传递的任何值都表示未正确处理它。
答案 0 :(得分:0)
会等待元素出现吗?
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()
})
})
})