bootstrap-vue/src/mixins/listen-on-window.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 { mount, createLocalVue as CreateLocalVue } from '@vue/test-utils'
import listenOnWindowMixin from './listen-on-window'

describe('mixins/listen-on-window', () => {
  const localVue = new CreateLocalVue()

  it('works', async () => {
    const spyResize1 = jest.fn()
    const spyResize2 = jest.fn()
    const spyScroll = jest.fn()

    const TestComponent = localVue.extend({
      mixins: [listenOnWindowMixin],
      props: {
        offResizeOne: {
          type: Boolean,
          default: false
        }
      },
      mounted() {
        this.listenOnWindow('resize', spyResize1)
        this.listenOnWindow('scroll', spyScroll)
        this.listenOnWindow('resize', spyResize2)
      },
      watch: {
        offResizeOne(newVal, oldVal) {
          if (newVal) {
            this.listenOffWindow('resize', spyResize1)
          }
        }
      },
      render(h) {
        return h('div', {}, this.$slots.default)
      }
    })

    const App = localVue.extend({
      components: { TestComponent },
      props: {
        offResizeOne: {
          type: Boolean,
          default: false
        },
        destroy: {
          type: Boolean,
          default: false
        }
      },
      render(h) {
        const props = {
          offResizeOne: this.offResizeOne
        }
        return h('div', {}, [this.destroy ? h() : h(TestComponent, { props }, 'test-component')])
      }
    })

    const wrapper = mount(App, {
      attachToDocument: true,
      propsData: {
        destroy: false
      }
    })

    expect(wrapper.isVueInstance()).toBe(true)
    expect(wrapper.text()).toEqual('test-component')

    expect(spyResize1).not.toHaveBeenCalled()
    expect(spyResize2).not.toHaveBeenCalled()
    expect(spyScroll).not.toHaveBeenCalled()

    window.dispatchEvent(new Event('scroll'))

    expect(spyResize1).not.toHaveBeenCalled()
    expect(spyResize2).not.toHaveBeenCalled()
    expect(spyScroll).toHaveBeenCalledTimes(1)

    window.dispatchEvent(new Event('resize'))

    expect(spyResize1).toHaveBeenCalledTimes(1)
    expect(spyResize2).toHaveBeenCalledTimes(1)
    expect(spyScroll).toHaveBeenCalledTimes(1)

    wrapper.setProps({
      offResizeOne: true
    })

    window.dispatchEvent(new Event('resize'))

    expect(spyResize1).toHaveBeenCalledTimes(1)
    expect(spyResize2).toHaveBeenCalledTimes(2)
    expect(spyScroll).toHaveBeenCalledTimes(1)

    window.dispatchEvent(new Event('scroll'))

    expect(spyResize1).toHaveBeenCalledTimes(1)
    expect(spyResize2).toHaveBeenCalledTimes(2)
    expect(spyScroll).toHaveBeenCalledTimes(2)

    wrapper.setProps({
      destroy: true
    })

    expect(spyResize1).toHaveBeenCalledTimes(1)
    expect(spyResize2).toHaveBeenCalledTimes(2)
    expect(spyScroll).toHaveBeenCalledTimes(2)

    window.dispatchEvent(new Event('scroll'))

    expect(spyResize1).toHaveBeenCalledTimes(1)
    expect(spyResize2).toHaveBeenCalledTimes(2)
    expect(spyScroll).toHaveBeenCalledTimes(2)

    window.dispatchEvent(new Event('resize'))

    expect(spyResize1).toHaveBeenCalledTimes(1)
    expect(spyResize2).toHaveBeenCalledTimes(2)
    expect(spyScroll).toHaveBeenCalledTimes(2)

    wrapper.destroy()
  })
})