jalaliday/test/plugin.add.test.ts

Persian (Jalali, Khorshidi) Plugin for Day.js

import dayjs from 'dayjs'
import MockDate from 'mockdate'
import { afterEach, beforeEach, describe, expect, it } from 'vitest'
import jalali from '../src/dayjs/plugin'

dayjs.extend(jalali)
dayjs.calendar('jalali')

type Dayjs = dayjs.Dayjs

describe('plugin.add', () => {
  beforeEach(() => {
    MockDate.set(new Date())
  })

  afterEach(() => {
    MockDate.reset()
  })

  it('add 1 day in the middle of the month', () => {
    const date = dayjs('1397/06/13', { jalali: true })
    const date2 = date.add(1, 'day')
    expect(date2.year()).toEqual(date.year())
    expect(date2.month()).toEqual(date.month())
    expect(date2.date()).toEqual(date.date() + 1)
  })

  it('add 1 day in the end of the month', () => {
    const date = dayjs('1397/06/31', { jalali: true })
    const date2 = date.add(1, 'day')
    expect(date2.year()).toEqual(date.year())
    expect(date2.month()).toEqual(date.month() + 1)
    expect(date2.date()).toEqual(1)
  })

  it('add 1 month in the middle of the year', () => {
    const date = dayjs('1397/06/13', { jalali: true })
    const date2 = date.add(1, 'month')
    expect(date2.year()).toEqual(date.year())
    expect(date2.month()).toEqual(date.month() + 1)
    expect(date2.date()).toEqual(date.date())
  })

  it('add 1 month in the end of the year', () => {
    const date = dayjs('1397/12/13', { jalali: true })
    const date2 = date.add(1, 'month')
    expect(date2.year()).toEqual(date.year() + 1)
    expect(date2.month()).toEqual(0)
    expect(date2.date()).toEqual(date.date())
  })

  it('add 1 year', () => {
    const date = dayjs('1397/12/13', { jalali: true })
    const date2 = date.add(1, 'year')
    expect(date2.year()).toEqual(date.year() + 1)
    expect(date2.month()).toEqual(date.month())
    expect(date2.date()).toEqual(date.date())
  })

  it('add 11 months in the middle of the year', () => {
    const date = dayjs('1396/06/13', { jalali: true })
    const date2 = date.add(11, 'month')
    expect(date2.year()).toEqual(date.year() + 1)
    expect(date2.month()).toEqual(date.month() - 1)
    expect(date2.date()).toEqual(date.date())
  })

  describe('add 100 days', () => {
    let a: Dayjs
    let b: Dayjs

    beforeEach(() => {
      a = dayjs('1397/06/01', { jalali: true })
      b = dayjs('1397/09/10', { jalali: true })
    })

    it('add date', () => {
      expect(a.add(100, 'day')).toEqual(b)
    })
  })

  describe('add 1 month in shahrivar 31th', () => {
    let a: Dayjs
    let b: Dayjs

    beforeEach(() => {
      a = dayjs('1397/06/31', { jalali: true })
      b = dayjs('1397/07/30', { jalali: true })
    })

    it('add date', () => {
      expect(a.add(1, 'month')).toEqual(b)
    })
  })
})