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Filename : date.test.js
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/*
 * Copyright (C) 2012 - present Instructure, Inc.
 *
 * This file is part of Canvas.
 *
 * Canvas is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, version 3 of the License.
 *
 * Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Affero General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

import '@instructure/date-js'

describe('Date', () => {
  const utc = function (...args) {
    return new Date(Date.UTC(...args))
  }

  test('Date.parse', () => {
    const examples = {
      // Mountain
      'Wed May 2 2012 00:00:00 MST': utc(2012, 4, 2, 7, 0, 0),
      'Wed May 2 2012 00:00:00 MDT': utc(2012, 4, 2, 6, 0, 0),
      '2012-05-02T00:00:00-06:00': utc(2012, 4, 2, 6, 0, 0),

      // variations on UTC
      'Wed May 2 2012 00:00:00 UTC': utc(2012, 4, 2, 0, 0, 0),
      'Wed May 2 2012 00:00:00 GMT': utc(2012, 4, 2, 0, 0, 0),
      '2012-05-02T00:00:00Z': utc(2012, 4, 2, 0, 0, 0),
      '2012-05-02T00:00:00-0000': utc(2012, 4, 2, 0, 0, 0),
      '2012-05-02T00:00:00+0000': utc(2012, 4, 2, 0, 0, 0),
      '2012-05-02T00:00:00+00:00': utc(2012, 4, 2, 0, 0, 0),
      '2012-05-02T00:00:00-00:00': utc(2012, 4, 2, 0, 0, 0),

      // partial-hour values
      '2012-05-02T00:00:00+02:30': utc(2012, 4, 1, 21, 30, 0),
      '2012-05-02T00:00:00-02:30': utc(2012, 4, 2, 2, 30, 0),
      '2012-05-02T00:00:00+01:01': utc(2012, 4, 1, 22, 59, 0),
      '2012-05-02T00:00:00-01:01': utc(2012, 4, 2, 1, 1, 0),
      '2012-05-02T00:00:00+01:59': utc(2012, 4, 1, 22, 1, 0),
      '2012-05-02T00:00:00-01:59': utc(2012, 4, 2, 1, 59, 0),
      '2012-05-02T00:00:00+00:01': utc(2012, 4, 1, 23, 59, 0),
      '2012-05-02T00:00:00-00:01': utc(2012, 4, 2, 0, 1, 0),

      // DST-ends edge case
      '2012-11-04T01:00:00-06:00': utc(2012, 10, 4, 7, 0, 0),
    }

    for (const dateString in examples) {
      const expectedDate = examples[dateString]
      const parsedDate = new Date(dateString).getTime()
      expect(parsedDate).toBe(expectedDate.getTime())
    }
  })

  test('date.getUTCOffset', () => {
    const examples = {
      // Mountain
      ' 360': '-0600',
      ' 420': '-0700',

      // UTC
      '   0': '+0000',

      // partial-hour values
      '-150': '+0230',
      ' 150': '-0230',
      ' -61': '+0101',
      '  61': '-0101',
      '-119': '+0159',
      ' 119': '-0159',
      '  -1': '+0001',
      '   1': '-0001',
    }

    for (const offset in examples) {
      const expectedResult = examples[offset]
      const date = new Date()
      jest.spyOn(date, 'getTimezoneOffset').mockReturnValue(Number(offset))
      expect(date.getUTCOffset()).toBe(expectedResult)
    }
  })

  test('date.add* at DST-end', () => {
    const date = new Date(2012, 10, 4, 0, 59, 59, 999)

    expect(
      date
        .clone()
        .addMilliseconds(1)
        .equals(new Date(date.clone().setUTCMilliseconds(1000)))
    ).toBe(true)
    expect(
      date
        .clone()
        .addSeconds(1)
        .equals(new Date(date.clone().setUTCSeconds(60)))
    ).toBe(true)
    expect(
      date
        .clone()
        .addMinutes(1)
        .equals(new Date(date.clone().setUTCMinutes(60)))
    ).toBe(true)
    expect(
      date
        .clone()
        .addHours(1)
        .equals(new Date(date.clone().setUTCHours(date.getUTCHours() + 1)))
    ).toBe(true)
  })

  test('date.set at DST-end', () => {
    const date = new Date(2012, 10, 4, 0, 0, 0)
    date.set({hour: 14})
    expect(date.getHours()).toBe(14)
    date.set({hour: 1})
    expect(date.getHours()).toBe(1)
  })
})