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import MockDate from 'mockdate'import dayjs from '../src'
const testPlugin = (o, c, d) => {  c.prototype.newApi = () => ('hello world')  d.newFunc = () => ('hi world')}const testPluginWithConfig = (o, c) => {  c.prototype.newApiWithConfig = () => (`hello world ${o || ''}`)}
dayjs.extend(testPlugin)dayjs.extend(testPluginWithConfig, 'good')
beforeEach(() => {  MockDate.set(new Date())})
afterEach(() => {  MockDate.reset()})
it('Plugin extend method and option', () => {  expect(dayjs().newApi()).toBe('hello world')  expect(dayjs().newApiWithConfig()).toBe('hello world good')})
it('Plugin extend dayjs', () => {  expect(dayjs.newFunc()).toBe('hi world')})
it('Plugin use core utils', () => {  // u => isUndefined  expect(dayjs().$utils().u).toBeInstanceOf(Function)})