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

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

import warn from './warn'

describe('utils/warn', () => {
  const dummyWarning = 'A Rush Of Blood To The Head'

  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()', () => {
      warn(dummyWarning)

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