在React模块中测试SweetAlert2的SweetAlert2钩子

Question

具有这样的React模块名Modal：

import withReactContent from 'sweetalert2-react-content'

export const Modal = withReactContent(Swal)
const showModal = props => {
  return Modal.fire({
    ...props,
    showCloseButton: true
  })
}

export default showModal

在另一个组件中用作用户操作的确认框。

export const renderDeployModal = (deploymentId) => {
  console.log(' - renderDeployModal - ')
  Modal.fire({
    type: 'question',
    text: `Are you sure you wish to re-deploy this (${deploymentId})?`,
    showCancelButton: true,
    confirmButtonText: 'Deploy',
    preConfirm: () => {
      console.log(' - preConfirm - ')
      return apiRequest(`/deployments/${deploymentId}/trigger`, {}, 'POST')
        .then(response => {
          return response.body
        })
        .catch(response => {
          Modal.showValidationMessage(response.message)
        })
    },
    allowOutsideClick: () => !Modal.isLoading()
  }).then(result => {
    if (result.value) {
      notify('success', 'Your deployment has triggered.')
    }
  })
}

实现可以工作，但是我被困住的地方是测试在preConfirm钩子中执行的逻辑，因为我无法找到在测试中手动触发Modal.clickConfirm()并实际工作的任何方法。

import * as mockModal from '../../modal'
jest.mock('../../modal')

describe('renderDeployModal', () => {

  it('fails to run a deploy without deploymentId argument', async () => {
    const Modal = mockModal.Modal.mockImplementationOnce()

    Modal.fire.mockImplementationOnce(() => Promise.resolve({ value: false }))
    Modal.clickConfirm = jest.fn()

    // Modal.clickConfirm.mockImplementation(() => Promise.resolve())
    // const spy = jest.spyOn(mockModal.Modal, 'clickConfirm')

    apiRequest.default = jest.fn().mockReturnValue(Promise.reject(new Error('foo')))
    await renderDeployModal(null)
    await Promise.resolve()

    Modal.clickConfirm()
    await Promise.resolve()

    expect(Modal.fire).toHaveBeenCalled()
    expect(Modal.clickConfirm).toHaveBeenCalled()
    expect(apiRequest.default).toHaveBeenCalledWith(`/deployments/null/trigger`, {}, 'POST')
  })

上述测试在最后一次对apiRequest的预期中失败。

  console.log src/actions.js:111
     - renderDeployModal -
 FAIL  src/actions.test.js
...
    ✕ fails to run a deploy without deploymentId argument (56ms)

  ● renderDeployModal › fails to run a deploy without deploymentId argument

    expect(jest.fn()).toHaveBeenCalledWith(expected)

    Expected mock function to have been called with:
      ["/deployments/null/trigger", {}, "POST"]
    But it was not called.

      148 |     expect(Modal.fire).toHaveBeenCalled()
      149 |     expect(Modal.clickConfirm).toHaveBeenCalled()
    > 150 |     expect(apiRequest.default).toHaveBeenCalledWith(`/deployments/null/trigger`, {}, 'POST')
          |                                ^

console.log(' - renderDeployModal - ')也出现了，但console.log(' - preConfirm - ')没有出现，这表明Modal.clickConfirm()没有正确触发。

我在这里错过了什么？我没有什么想法(好的或坏的)去尝试。

Answer 1

每当你像你一样嘲笑一个模块时

jest.mock('../../modal')

它在没有实现的情况下为模块对象的每个属性创建模拟函数。

因此，您要将一个对象传递给Modal.fire()，后者具有回调preConfirm，但是没有什么可以调用它。因此，您可能应该将模拟实现更改为如下所示：

Modal.fire.mockImplementationOnce(({ preConfirm }) => {
  preConfirm(); // <- execute the given callback
  return Promise.resolve({ value: false })
})

然后期望它被调用

附带注意：，顺便说一句，没有意义

test('if I call a function it`s actually being called', () => {
    Modal.clickConfirm() // <- execute a function within the test
    expect(Modal.clickConfirm).toHaveBeenCalled() // and make sure it have been called few lines below
});