admin-fe/test/views/reports/index.test.js

import Vuex from 'vuex'
import { mount, createLocalVue, config } from '@vue/test-utils'
import Element from 'element-ui'
import Reports from '@/views/reports/index'
import storeConfig from './store.conf'
import { cloneDeep } from 'lodash'
import flushPromises from 'flush-promises'

config.mocks["$t"] = () => {}
config.stubs['reports-filter'] = '<div />'
config.stubs['timeline-item'] = '<div />'

const localVue = createLocalVue()
localVue.use(Vuex)
localVue.use(Element)

jest.mock('@/api/reports')

describe('Reports', () => {
  let store

  beforeEach(() => {
    store = new Vuex.Store(cloneDeep(storeConfig))
  })

  it('initially fetches reports', async (done) => {
    const wrapper = mount(Reports, {
      store,
      localVue
    })

    await flushPromises()
    const initialReports = store.state.reports.fetchedReports.length
    expect(initialReports).toEqual(5)
    done()
  })

  it('loads more reports on scroll', async (done) => {
    const wrapper = mount(Reports, {
      store,
      localVue
    })

    await flushPromises()
    expect(store.state.reports.fetchedReports.length).toEqual(5)

    window.dispatchEvent(new CustomEvent('scroll', { detail: 2000 }))
    await flushPromises()
    expect(store.state.reports.fetchedReports.length).toEqual(7)
    done()
  })
})