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import MockDate from 'mockdate'import dayjs from '../../src'import isYesterday from '../../src/plugin/isYesterday'
dayjs.extend(isYesterday)
beforeEach(() => {  MockDate.set(new Date())})
afterEach(() => {  MockDate.reset()})
it('is yesterday', () => {  expect(dayjs().subtract(1, 'day').isYesterday()).toBeTruthy()  expect(dayjs('2017-01-01').isYesterday()).toBeFalsy()})