Question

Jest捕获stdout和stderr输出。是否可以在测试中访问捕获的信息？

问候，尼基尔

Answer 1

我用错误的方式来做这件事。我没有使用间谍/模拟，而是试图直接拦截stdout / stderr。我使用以下功能解决了该问题。

/* eslint-disable no-undef */
export function spyConsole() {
  let spy = {}

  beforeEach(() => {
    spy.console = jest.spyOn(console, 'error').mockImplementation(() => {})
  })

  afterEach(() => {
    spy.console.mockClear()
  })

  afterAll(() => {
    spy.console.mockRestore()
  })

  return spy
}

通过以下方式使用：

import { createLocalVue, mount } from '@vue/test-utils'
import { spyConsole } from '@tst/helpers/test-utils'
import Vuetify from 'vuetify'
import VBtnPlus from '@/components/common/VBtnPlus.vue'

describe('VStatsCard.vue', () => {
  let localVue = null

  beforeEach(() => {
    localVue = createLocalVue()
    localVue.use(Vuetify)
  })

  describe('test prop warnings', () => {
    let spy = spyConsole()

    it('displays warning messages when both label and icon are not specified', () => {
      mount(VBtnPlus, {
        localVue: localVue
      })
      expect(console.error).toHaveBeenCalledTimes(1)
      expect(spy.console.mock.calls[0][0]).toContain(
        '[Vue warn]: Missing required prop, specify at least one of the following: "label" or "icon"'
      )
    })
  })
})

访问Jest中捕获的stderr输出

1 个答案: