bootstrap-vue/src/utils/warn.spec.js

BootstrapVue, with over 40 plugins and more than 80 custom components, custom directives, and over 300 icons, provides one of the most comprehensive implementations of Bootstrap v4 components and grid system for Vue.js. With extensive and automated WAI-AR

import { warn } from './warn'

describe('utils/warn', () => {
  const dummyWarning = 'This is a dummy warning.'
  const dummySource = 'DummyComponent'

  let originalProcess

  beforeAll(() => {
    jest.spyOn(console, 'warn').mockImplementation(() => {})
    originalProcess = global.process
  })

  afterEach(() => {
    console.warn.mockClear()
    global.process = originalProcess
  })

  describe('with "BOOTSTRAP_VUE_NO_WARN" environment variable set', () => {
    beforeEach(() => {
      global.process = {
        env: {
          BOOTSTRAP_VUE_NO_WARN: true
        }
      }
    })

    it('does not call "console.warn()"', () => {
      warn(dummyWarning)

      expect(console.warn).not.toHaveBeenCalled()
    })
  })

  describe('without process object', () => {
    beforeEach(() => {
      delete global.process
    })

    it('calls "console.warn()" with warning', () => {
      warn(dummyWarning)

      expect(console.warn).toHaveBeenCalledWith(`[BootstrapVue warn]: ${dummyWarning}`)
    })

    it('calls "console.warn()" with warning and source', () => {
      warn(dummyWarning, dummySource)

      expect(console.warn).toHaveBeenCalledWith(
        `[BootstrapVue warn]: ${dummySource} - ${dummyWarning}`
      )
    })
  })
})