test.js

// @flow
/* eslint-env mocha */

import assert from 'power-assert'
import parse from '.'

describe('parse', function() {
  var baseDate = new Date(1986, 3 /* Apr */, 4, 10, 32, 0, 900)

  it('escapes characters between the single quote characters', function() {
    var result = parse(
      '2018 hello world July 2nd',
      "yyyy 'hello world' MMMM do",
      baseDate
    )
    assert.deepEqual(result, new Date(2018, 6 /* Jul */, 2))
  })

  it('two single quote characters are transformed into a "real" single quote', function() {
    var result = parse("'5 o'clock'", "''h 'o''clock'''", baseDate)
    assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 5))
  })

  describe('era', function() {
    it('abbreviated', function() {
      var result = parse('10000 BC', 'yyyyy G', baseDate)
      assert.deepEqual(result, new Date(-9999, 0 /* Jan */, 1))
    })

    it('wide', function() {
      var result = parse('2018 Anno Domini', 'yyyy GGGG', baseDate)
      assert.deepEqual(result, new Date(2018, 0 /* Jan */, 1))
    })

    it('narrow', function() {
      var result = parse('44 B', 'y GGGGG', baseDate)
      assert.deepEqual(result, new Date(-43, 0 /* Jan */, 1))
    })

    it('with week-numbering year', function() {
      var result = parse('44 B', 'Y GGGGG', baseDate)
      assert.deepEqual(result, new Date(-44, 11 /* Dec */, 30))
    })
  })

  describe('calendar year', function() {
    it('numeric', function() {
      var result = parse('2017', 'y', baseDate)
      assert.deepEqual(result, new Date(2017, 0 /* Jan */, 1))
    })

    it('ordinal', function() {
      var result = parse('2017th', 'yo', baseDate)
      assert.deepEqual(result, new Date(2017, 0 /* Jan */, 1))
    })

    describe('two-digit numeric year', function() {
      it('works as expected', function() {
        var result = parse('02', 'yy', baseDate)
        assert.deepEqual(result, new Date(2002, 0 /* Jan */, 1))
      })

      it('gets the 100 year range from `baseDate`', function() {
        var result = parse('02', 'yy', new Date(1860, 6 /* Jul */, 2))
        assert.deepEqual(result, new Date(1902, 0 /* Jan */, 1))
      })
    })

    it('three-digit zero-padding', function() {
      var result = parse('123', 'yyy', baseDate)
      assert.deepEqual(result, new Date(123, 0 /* Jan */, 1))
    })

    it('four-digit zero-padding', function() {
      var result = parse('0044', 'yyyy', baseDate)
      var expectedResult = new Date(44, 0 /* Jan */, 1)
      expectedResult.setFullYear(44)
      assert.deepEqual(result, expectedResult)
    })

    it('specified amount of digits', function() {
      var result = parse('000001', 'yyyyyy', baseDate)
      var expectedResult = new Date(1, 0 /* Jan */, 1)
      expectedResult.setFullYear(1)
      assert.deepEqual(result, expectedResult)
    })
  })

  describe('local week-numbering year', function() {
    it('numeric', function() {
      var result = parse('2002', 'Y', baseDate)
      assert.deepEqual(result, new Date(2001, 11 /* Dec */, 30))
    })

    it('ordinal', function() {
      var result = parse('12345th', 'Yo', baseDate)
      assert.deepEqual(result, new Date(12344, 11 /* Dec */, 31))
    })

    describe('two-digit numeric year', function() {
      it('works as expected', function() {
        var result = parse('02', 'YY', baseDate, {
          useAdditionalWeekYearTokens: true
        })
        assert.deepEqual(result, new Date(2001, 11 /* Dec */, 30))
      })

      it('gets the 100 year range from `baseDate`', function() {
        var result = parse('02', 'YY', new Date(1860, 6 /* Jul */, 2), {
          useAdditionalWeekYearTokens: true
        })
        assert.deepEqual(result, new Date(1901, 11 /* Dec */, 29))
      })
    })

    it('three-digit zero-padding', function() {
      var result = parse('123', 'YYY', baseDate)
      assert.deepEqual(result, new Date(122, 11 /* Dec */, 27))
    })

    it('four-digit zero-padding', function() {
      var result = parse('2018', 'YYYY', baseDate, {
        useAdditionalWeekYearTokens: true
      })
      assert.deepEqual(result, new Date(2017, 11 /* Dec */, 31))
    })

    it('specified amount of digits', function() {
      var result = parse('000001', 'YYYYYY', baseDate)
      var expectedResult = new Date(0)
      expectedResult.setFullYear(0, 11 /* Dec */, 31)
      expectedResult.setHours(0, 0, 0, 0)
      assert.deepEqual(result, expectedResult)
    })

    it('allows to specify `weekStartsOn` and `firstWeekContainsDate` in options', function() {
      var result = parse('2018', 'Y', baseDate, {
        weekStartsOn: 1 /* Mon */,
        firstWeekContainsDate: 4
      })
      assert.deepEqual(result, new Date(2018, 0 /* Jan */, 1))
    })
  })

  describe('ISO week-numbering year', function() {
    it('numeric', function() {
      var result = parse('-1234', 'R', baseDate)
      assert.deepEqual(result, new Date(-1234, 0 /* Jan */, 3))
    })

    it('two-digit zero-padding', function() {
      var result = parse('-02', 'RR', baseDate)
      assert.deepEqual(result, new Date(-3, 11 /* Dec */, 29))
    })

    it('three-digit zero-padding', function() {
      var result = parse('123', 'RRR', baseDate)
      assert.deepEqual(result, new Date(123, 0 /* Jan */, 4))
    })

    it('four-digit zero-padding', function() {
      var result = parse('2018', 'RRRR', baseDate)
      assert.deepEqual(result, new Date(2018, 0 /* Jan */, 1))
    })

    it('specified amount of digits', function() {
      var result = parse('000001', 'RRRRRR', baseDate)
      var expectedResult = new Date(1, 0 /* Jan */, 1)
      expectedResult.setFullYear(1)
      assert.deepEqual(result, expectedResult)
    })
  })

  describe('extended year', function() {
    it('numeric', function() {
      var result = parse('-1234', 'u', baseDate)
      assert.deepEqual(result, new Date(-1234, 0 /* Jan */, 1))
    })

    it('two-digit zero-padding', function() {
      var result = parse('-02', 'uu', baseDate)
      assert.deepEqual(result, new Date(-2, 0 /* Jan */, 1))
    })

    it('three-digit zero-padding', function() {
      var result = parse('123', 'uuu', baseDate)
      assert.deepEqual(result, new Date(123, 0 /* Jan */, 1))
    })

    it('four-digit zero-padding', function() {
      var result = parse('2018', 'uuuu', baseDate)
      assert.deepEqual(result, new Date(2018, 0 /* Jan */, 1))
    })

    it('specified amount of digits', function() {
      var result = parse('000001', 'uuuuuu', baseDate)
      var expectedResult = new Date(1, 0 /* Jan */, 1)
      expectedResult.setFullYear(1)
      assert.deepEqual(result, expectedResult)
    })
  })

  describe('quarter (formatting)', function() {
    it('numeric', function() {
      var result = parse('1', 'Q', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })

    it('ordinal', function() {
      var result = parse('1st', 'Qo', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })

    it('zero-padding', function() {
      var result = parse('02', 'QQ', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 1))
    })

    it('abbreviated', function() {
      var result = parse('Q3', 'QQQ', baseDate)
      assert.deepEqual(result, new Date(1986, 6 /* Jul */, 1))
    })

    it('wide', function() {
      var result = parse('4st quarter', 'QQQQ', baseDate)
      assert.deepEqual(result, new Date(1986, 9 /* Oct */, 1))
    })

    it('narrow', function() {
      var result = parse('1', 'QQQQQ', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })
  })

  describe('quarter (stand-alone)', function() {
    it('numeric', function() {
      var result = parse('1', 'q', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })

    it('ordinal', function() {
      var result = parse('1th', 'qo', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })

    it('zero-padding', function() {
      var result = parse('02', 'qq', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 1))
    })

    it('abbreviated', function() {
      var result = parse('Q3', 'qqq', baseDate)
      assert.deepEqual(result, new Date(1986, 6 /* Jul */, 1))
    })

    it('wide', function() {
      var result = parse('4th quarter', 'qqqq', baseDate)
      assert.deepEqual(result, new Date(1986, 9 /* Oct */, 1))
    })

    it('narrow', function() {
      var result = parse('1', 'qqqqq', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })
  })

  describe('month (formatting)', function() {
    it('numeric', function() {
      var result = parse('6', 'M', baseDate)
      assert.deepEqual(result, new Date(1986, 5 /* Jun */, 1))
    })

    it('ordinal', function() {
      var result = parse('6th', 'Mo', baseDate)
      assert.deepEqual(result, new Date(1986, 5 /* Jun */, 1))
    })

    it('zero-padding', function() {
      var result = parse('01', 'MM', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })

    it('abbreviated', function() {
      var result = parse('Nov', 'MMM', baseDate)
      assert.deepEqual(result, new Date(1986, 10 /* Nov */, 1))
    })

    it('wide', function() {
      var result = parse('February', 'MMMM', baseDate)
      assert.deepEqual(result, new Date(1986, 1 /* Feb */, 1))
    })

    it('narrow', function() {
      var result = parse('J', 'MMMMM', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })
  })

  describe('month (stand-alone)', function() {
    it('numeric', function() {
      var result = parse('6', 'L', baseDate)
      assert.deepEqual(result, new Date(1986, 5 /* Jun */, 1))
    })

    it('ordinal', function() {
      var result = parse('6th', 'Lo', baseDate)
      assert.deepEqual(result, new Date(1986, 5 /* Jun */, 1))
    })

    it('zero-padding', function() {
      var result = parse('01', 'LL', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })

    it('abbreviated', function() {
      var result = parse('Nov', 'LLL', baseDate)
      assert.deepEqual(result, new Date(1986, 10 /* Nov */, 1))
    })

    it('wide', function() {
      var result = parse('February', 'LLLL', baseDate)
      assert.deepEqual(result, new Date(1986, 1 /* Feb */, 1))
    })

    it('narrow', function() {
      var result = parse('J', 'LLLLL', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })
  })

  describe('local week of year', function() {
    it('numeric', function() {
      var result = parse('49', 'w', baseDate)
      assert.deepEqual(result, new Date(1986, 10 /* Nov */, 30))
    })

    it('ordinal', function() {
      var result = parse('49th', 'wo', baseDate)
      assert.deepEqual(result, new Date(1986, 10 /* Nov */, 30))
    })

    it('zero-padding', function() {
      var result = parse('01', 'ww', baseDate)
      assert.deepEqual(result, new Date(1985, 11 /* Dec */, 29))
    })

    it('allows to specify `weekStartsOn` and `firstWeekContainsDate` in options', function() {
      var result = parse('49', 'w', baseDate, {
        weekStartsOn: 1 /* Mon */,
        firstWeekContainsDate: 4
      })
      assert.deepEqual(result, new Date(1986, 11 /* Dec */, 1))
    })
  })

  describe('ISO week of year', function() {
    it('numeric', function() {
      var result = parse('49', 'I', baseDate)
      assert.deepEqual(result, new Date(1986, 11 /* Dec */, 1))
    })

    it('ordinal', function() {
      var result = parse('49th', 'Io', baseDate)
      assert.deepEqual(result, new Date(1986, 11 /* Dec */, 1))
    })

    it('zero-padding', function() {
      var result = parse('01', 'II', baseDate)
      assert.deepEqual(result, new Date(1985, 11 /* Dec */, 30))
    })
  })

  describe('day of month', function() {
    it('numeric', function() {
      var result = parse('28', 'd', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 28))
    })

    it('ordinal', function() {
      var result = parse('28th', 'do', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 28))
    })

    it('zero-padding', function() {
      var result = parse('01', 'dd', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 1))
    })
  })

  describe('day of year', function() {
    it('numeric', function() {
      var result = parse('200', 'D', baseDate, {
        useAdditionalDayOfYearTokens: true
      })
      assert.deepEqual(result, new Date(1986, 6 /* Jul */, 19))
    })

    it('ordinal', function() {
      var result = parse('200th', 'Do', baseDate)
      assert.deepEqual(result, new Date(1986, 6 /* Jul */, 19))
    })

    it('two-digit zero-padding', function() {
      var result = parse('01', 'DD', baseDate, {
        useAdditionalDayOfYearTokens: true
      })
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })

    it('three-digit zero-padding', function() {
      var result = parse('001', 'DDD', baseDate)
      assert.deepEqual(result, new Date(1986, 0 /* Jan */, 1))
    })

    it('specified amount of digits', function() {
      var result = parse('000200', 'DDDDDD', baseDate)
      assert.deepEqual(result, new Date(1986, 6 /* Jul */, 19))
    })
  })

  describe('day of week (formatting)', function() {
    it('abbreviated', function() {
      var result = parse('Mon', 'E', baseDate)
      assert.deepEqual(result, new Date(1986, 2 /* Mar */, 31))
    })

    it('wide', function() {
      var result = parse('Tuesday', 'EEEE', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 1))
    })

    it('narrow', function() {
      var result = parse('W', 'EEEEE', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 2))
    })

    it('short', function() {
      var result = parse('Th', 'EEEEEE', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 3))
    })

    it('allows to specify which day is the first day of the week', function() {
      var result = parse('Thursday', 'EEEE', baseDate, {
        weekStartsOn: /* Fri */ 5
      })
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 10))
    })
  })

  describe('ISO day of week (formatting)', function() {
    it('numeric', function() {
      var result = parse('1', 'i', baseDate)
      assert.deepEqual(result, new Date(1986, 2 /* Mar */, 31))
    })

    it('ordinal', function() {
      var result = parse('1st', 'io', baseDate)
      assert.deepEqual(result, new Date(1986, 2 /* Mar */, 31))
    })

    it('zero-padding', function() {
      var result = parse('02', 'ii', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 1))
    })

    it('abbreviated', function() {
      var result = parse('Wed', 'iii', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 2))
    })

    it('wide', function() {
      var result = parse('Thursday', 'iiii', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 3))
    })

    it('narrow', function() {
      var result = parse('S', 'iiiii', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 6))
    })

    it('short', function() {
      var result = parse('Fr', 'iiiiii', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4))
    })
  })

  describe('local day of week (formatting)', function() {
    it('numeric', function() {
      var result = parse('2', 'e', baseDate)
      assert.deepEqual(result, new Date(1986, 2 /* Mar */, 31))
    })

    it('ordinal', function() {
      var result = parse('2nd', 'eo', baseDate)
      assert.deepEqual(result, new Date(1986, 2 /* Mar */, 31))
    })

    it('zero-padding', function() {
      var result = parse('03', 'ee', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 1))
    })

    it('abbreviated', function() {
      var result = parse('Wed', 'eee', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 2))
    })

    it('wide', function() {
      var result = parse('Thursday', 'eeee', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 3))
    })

    it('narrow', function() {
      var result = parse('S', 'eeeee', baseDate)
      assert.deepEqual(result, new Date(1986, 2 /* Mar */, 30))
    })

    it('short', function() {
      var result = parse('Fr', 'eeeeee', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4))
    })

    it('allows to specify which day is the first day of the week', function() {
      var result = parse('7th', 'eo', baseDate, { weekStartsOn: /* Fri */ 5 })
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 10))
    })
  })

  describe('local day of week (stand-alone)', function() {
    it('numeric', function() {
      var result = parse('2', 'c', baseDate)
      assert.deepEqual(result, new Date(1986, 2 /* Mar */, 31))
    })

    it('ordinal', function() {
      var result = parse('2nd', 'co', baseDate)
      assert.deepEqual(result, new Date(1986, 2 /* Mar */, 31))
    })

    it('zero-padding', function() {
      var result = parse('03', 'cc', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 1))
    })

    it('abbreviated', function() {
      var result = parse('Wed', 'ccc', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 2))
    })

    it('wide', function() {
      var result = parse('Thursday', 'cccc', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 3))
    })

    it('narrow', function() {
      var result = parse('S', 'ccccc', baseDate)
      assert.deepEqual(result, new Date(1986, 2 /* Mar */, 30))
    })

    it('short', function() {
      var result = parse('Fr', 'cccccc', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4))
    })

    it('allows to specify which day is the first day of the week', function() {
      var result = parse('7th', 'co', baseDate, { weekStartsOn: /* Fri */ 5 })
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 10))
    })
  })

  describe('AM, PM', function() {
    it('abbreviated', function() {
      var result = parse('5 AM', 'h a', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 5))
    })

    it('12 AM', function() {
      var result = parse('12 AM', 'h aa', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 0))
    })

    it('12 PM', function() {
      var result = parse('12 PM', 'h aaa', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 12))
    })

    it('wide', function() {
      var result = parse('5 p.m.', 'h aaaa', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 17))
    })

    it('narrow', function() {
      var result = parse('11 a', 'h aaaaa', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 11))
    })
  })

  describe('AM, PM, noon, midnight', function() {
    it('abbreviated', function() {
      var result = parse('noon', 'b', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 12))
    })

    it('wide', function() {
      var result = parse('midnight', 'bbbb', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 0))
    })

    it('narrow', function() {
      var result = parse('mi', 'bbbbb', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 0))
    })
  })

  describe('flexible day period', function() {
    it('abbreviated', function() {
      var result = parse('2 at night', 'h B', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 2))
    })

    it('wide', function() {
      var result = parse('12 in the afternoon', 'h BBBB', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 12))
    })

    it('narrow', function() {
      var result = parse('5 in the evening', 'h BBBBB', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 17))
    })
  })

  describe('hour [1-12]', function() {
    it('numeric', function() {
      var result = parse('1', 'h', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 1))
    })

    it('ordinal', function() {
      var result = parse('1st', 'ho', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 1))
    })

    it('zero-padding', function() {
      var result = parse('01', 'hh', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 1))
    })
  })

  describe('hour [0-23]', function() {
    it('numeric', function() {
      var result = parse('12', 'H', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 12))
    })

    it('ordinal', function() {
      var result = parse('12th', 'Ho', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 12))
    })

    it('zero-padding', function() {
      var result = parse('00', 'HH', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 0))
    })
  })

  describe('hour [0-11]', function() {
    it('numeric', function() {
      var result = parse('1', 'K', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 1))
    })

    it('ordinal', function() {
      var result = parse('1st', 'Ko', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 1))
    })

    it('zero-padding', function() {
      var result = parse('1', 'KK', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 1))
    })
  })

  describe('hour [1-24]', function() {
    it('numeric', function() {
      var result = parse('12', 'k', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 12))
    })

    it('ordinal', function() {
      var result = parse('12th', 'ko', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 12))
    })

    it('zero-padding', function() {
      var result = parse('24', 'kk', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 0))
    })
  })

  describe('minute', function() {
    it('numeric', function() {
      var result = parse('25', 'm', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 10, 25))
    })

    it('ordinal', function() {
      var result = parse('25th', 'mo', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 10, 25))
    })

    it('zero-padding', function() {
      var result = parse('05', 'mm', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 10, 5))
    })
  })

  describe('second', function() {
    it('numeric', function() {
      var result = parse('25', 's', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 10, 32, 25))
    })

    it('ordinal', function() {
      var result = parse('25th', 'so', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 10, 32, 25))
    })

    it('zero-padding', function() {
      var result = parse('05', 'ss', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 10, 32, 5))
    })
  })

  describe('fraction of second', function() {
    it('1/10 of second', function() {
      var result = parse('1', 'S', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 10, 32, 0, 100))
    })

    it('1/100 of second', function() {
      var result = parse('12', 'SS', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 10, 32, 0, 120))
    })

    it('millisecond', function() {
      var result = parse('123', 'SSS', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 10, 32, 0, 123))
    })

    it('specified amount of digits', function() {
      var result = parse('567890', 'SSSSSS', baseDate)
      assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 10, 32, 0, 567))
    })

    it('after timestamp', () => {
      const time = new Date(1987, 1, 11, 0, 0, 0).getTime()
      const result = parse(
        `${Math.floor(time / 1000)}.123`,
        't.SSS',
        Date.now()
      )
      assert.deepEqual(result, new Date(1987, 1, 11, 0, 0, 0, 123))
    })
  })

  describe('timezone (ISO-8601 w/ Z)', function() {
    describe('X', function() {
      it('hours and minutes', function() {
        var result = parse(
          '2016-11-25T16:38:38.123-0530',
          "yyyy-MM-dd'T'HH:mm:ss.SSSX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123-05:30'))
      })

      it('GMT', function() {
        var result = parse(
          '2016-11-25T16:38:38.123Z',
          "yyyy-MM-dd'T'HH:mm:ss.SSSX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123Z'))
      })

      it('hours', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+05',
          "yyyy-MM-dd'T'HH:mm:ss.SSSX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123+05:00'))
      })
    })

    describe('XX', function() {
      it('hours and minutes', function() {
        var result = parse(
          '2016-11-25T16:38:38.123-0530',
          "yyyy-MM-dd'T'HH:mm:ss.SSSXX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123-05:30'))
      })

      it('GMT', function() {
        var result = parse(
          '2016-11-25T16:38:38.123Z',
          "yyyy-MM-dd'T'HH:mm:ss.SSSXX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123Z'))
      })
    })

    describe('XXX', function() {
      it('hours and minutes', function() {
        var result = parse(
          '2016-11-25T16:38:38.123-05:30',
          "yyyy-MM-dd'T'HH:mm:ss.SSSXXX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123-05:30'))
      })

      it('GMT', function() {
        var result = parse(
          '2016-11-25T16:38:38.123Z',
          "yyyy-MM-dd'T'HH:mm:ss.SSSXXX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123Z'))
      })
    })

    describe('XXXX', function() {
      it('hours and minutes', function() {
        var result = parse(
          '2016-11-25T16:38:38.123-0530',
          "yyyy-MM-dd'T'HH:mm:ss.SSSXXXX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123-05:30'))
      })

      it('GMT', function() {
        var result = parse(
          '2016-11-25T16:38:38.123Z',
          "yyyy-MM-dd'T'HH:mm:ss.SSSXXXX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123Z'))
      })

      it('hours, minutes and seconds', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+053045',
          "yyyy-MM-dd'T'HH:mm:ss.SSSXXXX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:37:53.123+05:30'))
      })
    })

    describe('XXXXX', function() {
      it('hours and minutes', function() {
        var result = parse(
          '2016-11-25T16:38:38.123-05:30',
          "yyyy-MM-dd'T'HH:mm:ss.SSSXXXXX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123-05:30'))
      })

      it('GMT', function() {
        var result = parse(
          '2016-11-25T16:38:38.123Z',
          "yyyy-MM-dd'T'HH:mm:ss.SSSXXXXX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123Z'))
      })

      it('hours, minutes and seconds', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+05:30:45',
          "yyyy-MM-dd'T'HH:mm:ss.SSSXXXXX",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:37:53.123+05:30'))
      })
    })
  })

  describe('timezone (ISO-8601 w/o Z)', function() {
    describe('x', function() {
      it('hours and minutes', function() {
        var result = parse(
          '2016-11-25T16:38:38.123-0530',
          "yyyy-MM-dd'T'HH:mm:ss.SSSx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123-05:30'))
      })

      it('GMT', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+0000',
          "yyyy-MM-dd'T'HH:mm:ss.SSSx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123Z'))
      })

      it('hours', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+05',
          "yyyy-MM-dd'T'HH:mm:ss.SSSx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123+05:00'))
      })
    })

    describe('xx', function() {
      it('hours and minutes', function() {
        var result = parse(
          '2016-11-25T16:38:38.123-0530',
          "yyyy-MM-dd'T'HH:mm:ss.SSSxx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123-05:30'))
      })

      it('GMT', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+0000',
          "yyyy-MM-dd'T'HH:mm:ss.SSSxx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123Z'))
      })
    })

    describe('xxx', function() {
      it('hours and minutes', function() {
        var result = parse(
          '2016-11-25T16:38:38.123-05:30',
          "yyyy-MM-dd'T'HH:mm:ss.SSSxxx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123-05:30'))
      })

      it('GMT', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+00:00',
          "yyyy-MM-dd'T'HH:mm:ss.SSSxxx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123Z'))
      })
    })

    describe('xxxx', function() {
      it('hours and minutes', function() {
        var result = parse(
          '2016-11-25T16:38:38.123-0530',
          "yyyy-MM-dd'T'HH:mm:ss.SSSxxxx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123-05:30'))
      })

      it('GMT', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+0000',
          "yyyy-MM-dd'T'HH:mm:ss.SSSxxxx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123Z'))
      })

      it('hours, minutes and seconds', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+053045',
          "yyyy-MM-dd'T'HH:mm:ss.SSSxxxx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:37:53.123+05:30'))
      })
    })

    describe('xxxxx', function() {
      it('hours and minutes', function() {
        var result = parse(
          '2016-11-25T16:38:38.123-05:30',
          "yyyy-MM-dd'T'HH:mm:ss.SSSxxxxx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123-05:30'))
      })

      it('GMT', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+00:00',
          "yyyy-MM-dd'T'HH:mm:ss.SSSxxxxx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:38:38.123Z'))
      })

      it('hours, minutes and seconds', function() {
        var result = parse(
          '2016-11-25T16:38:38.123+05:30:45',
          "yyyy-MM-dd'T'HH:mm:ss.SSSxxxxx",
          baseDate
        )
        assert.deepEqual(result, new Date('2016-11-25T16:37:53.123+05:30'))
      })
    })
  })

  describe('seconds timestamp', function() {
    it('numeric', function() {
      var result = parse('512969520', 't', baseDate)
      assert.deepEqual(result, new Date(512969520000))
    })

    it('specified amount of digits', function() {
      var result = parse(
        '00000000000512969520',
        'tttttttttttttttttttt',
        baseDate
      )
      assert.deepEqual(result, new Date(512969520000))
    })
  })

  describe('milliseconds timestamp', function() {
    it('numeric', function() {
      var result = parse('512969520900', 'T', baseDate)
      assert.deepEqual(result, new Date(512969520900))
    })

    it('specified amount of digits', function() {
      var result = parse(
        '00000000512969520900',
        'TTTTTTTTTTTTTTTTTTTT',
        baseDate
      )
      assert.deepEqual(result, new Date(512969520900))
    })
  })

  describe('common formats', function() {
    it('ISO-8601', function() {
      var result = parse('20161105T040404', "yyyyMMdd'T'HHmmss", baseDate)
      assert.deepEqual(result, new Date(2016, 10 /* Nov */, 5, 4, 4, 4, 0))
    })

    it('ISO week-numbering date', function() {
      var result = parse('2016W474T153005', "RRRR'W'IIi'T'HHmmss", baseDate)
      assert.deepEqual(result, new Date(2016, 10 /* Nov */, 24, 15, 30, 5, 0))
    })

    it('ISO day of year date', function() {
      var result = parse('2010123T235959', "yyyyDDD'T'HHmmss", baseDate)
      assert.deepEqual(result, new Date(2010, 4 /* May */, 3, 23, 59, 59, 0))
    })

    it('Date.prototype.toString()', function() {
      var dateString = 'Wed Jul 02 2014 05:30:15 GMT+0600'
      var formatString = "EEE MMM dd yyyy HH:mm:ss 'GMT'xx"
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, new Date(dateString))
    })

    it('Date.prototype.toISOString()', function() {
      var dateString = '2014-07-02T05:30:15.123+06:00'
      var formatString = "yyyy-MM-dd'T'HH:mm:ss.SSSxxx"
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, new Date(dateString))
    })

    it('middle-endian', function() {
      var result = parse('5 a.m. 07/02/2016', 'h aaaa MM/dd/yyyy', baseDate)
      assert.deepEqual(result, new Date(2016, 6 /* Jul */, 2, 5, 0, 0, 0))
    })

    it('little-endian', function() {
      var result = parse('02.07.1995', 'dd.MM.yyyy', baseDate)
      assert.deepEqual(result, new Date(1995, 6 /* Jul */, 2, 0, 0, 0, 0))
    })
  })

  describe('priority', function() {
    it("units of lower priority don't overwrite values of higher priority", function() {
      var dateString = '+06:00 123 15 30 05 02 07 2014'
      var formatString = 'xxx SSS ss mm HH dd MM yyyy'
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, new Date('2014-07-02T05:30:15.123+06:00'))
    })

    it('units of equal priority overwrite each other in order of appearance', function() {
      var dateString = '25 1950 75 2000 January Feb 03 4 1 123 12'
      var formatString = 'RR RRRR yy yyyy MMMM MMM MM M d DDD dd'
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, new Date(2000, 3 /* Apr */, 12))
    })

    it('milliseconds timestamp overwrites everything', function() {
      var dateString = '512969520900 512969520 2014-07-02T05:30:15.123+06:00'
      var formatString = "T t yyyy-MM-dd'T'HH:mm:ss.SSSxxx"
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, new Date(512969520900))
    })
  })

  describe('implicit conversion of arguments', function() {
    it('`dateString`', function() {
      // eslint-disable-next-line no-new-wrappers
      var dateString = new String('20161105T040404')
      // $ExpectedMistake
      var result = parse(dateString, "yyyyMMdd'T'HHmmss", baseDate)
      assert.deepEqual(result, new Date(2016, 10 /* Nov */, 5, 4, 4, 4, 0))
    })

    it('`formatString`', function() {
      // eslint-disable-next-line no-new-wrappers
      var formatString = new String("yyyyMMdd'T'HHmmss")
      // $ExpectedMistake
      var result = parse('20161105T040404', formatString, baseDate)
      assert.deepEqual(result, new Date(2016, 10 /* Nov */, 5, 4, 4, 4, 0))
    })

    it('`options.weekStartsOn`', function() {
      // $ExpectedMistake
      var result = parse('2018', 'Y', baseDate, {
        weekStartsOn: '1' /* Mon */,
        firstWeekContainsDate: 4
      })
      assert.deepEqual(result, new Date(2018, 0 /* Jan */, 1))
    })

    it('`options.firstWeekContainsDate`', function() {
      // $ExpectedMistake
      var result = parse('2018', 'Y', baseDate, {
        weekStartsOn: 1 /* Mon */,
        firstWeekContainsDate: '4'
      })
      assert.deepEqual(result, new Date(2018, 0 /* Jan */, 1))
    })
  })

  describe('with `options.strictValidation` = true', function() {
    describe('calendar year', function() {
      it('returns `Invalid Date` for year zero', function() {
        var result = parse('0', 'y', baseDate)
        assert(result instanceof Date && isNaN(result))
      })

      it('works correctly for two-digit year zero', function() {
        var result = parse('00', 'yy', baseDate)
        assert.deepEqual(result, new Date(2000, 0 /* Jan */, 1))
      })
    })

    describe('local week-numbering year', function() {
      it('returns `Invalid Date` for year zero', function() {
        var result = parse('0', 'Y', baseDate)
        assert(result instanceof Date && isNaN(result))
      })

      it('works correctly for two-digit year zero', function() {
        var result = parse('00', 'YY', baseDate, {
          useAdditionalWeekYearTokens: true
        })
        assert.deepEqual(result, new Date(1999, 11 /* Dec */, 26))
      })
    })

    describe('quarter (formatting)', function() {
      it('returns `Invalid Date` for invalid quarter', function() {
        var result = parse('0', 'Q', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('quarter (stand-alone)', function() {
      it('returns `Invalid Date` for invalid quarter', function() {
        var result = parse('5', 'q', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('month (formatting)', function() {
      it('returns `Invalid Date` for invalid month', function() {
        var result = parse('00', 'MM', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('month (stand-alone)', function() {
      it('returns `Invalid Date` for invalid month', function() {
        var result = parse('13', 'LL', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('local week of year', function() {
      it('returns `Invalid Date` for invalid week', function() {
        var result = parse('0', 'w', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('ISO week of year', function() {
      it('returns `Invalid Date` for invalid week', function() {
        var result = parse('54', 'II', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('day of month', function() {
      it('returns `Invalid Date` for invalid day of the month', function() {
        var result = parse('30', 'd', new Date(2012, 1 /* Feb */, 1))
        assert(result instanceof Date && isNaN(result))
      })

      it('returns `Invalid Date` for 29th of February of non-leap year', function() {
        var result = parse('29', 'd', new Date(2014, 1 /* Feb */, 1))
        assert(result instanceof Date && isNaN(result))
      })

      it('parses 29th of February of leap year', function() {
        var result = parse('29', 'd', new Date(2012, 1 /* Feb */, 1))
        assert.deepEqual(result, new Date(2012, 1 /* Feb */, 29))
      })
    })

    describe('day of year', function() {
      it('returns `Invalid Date` for invalid day of the year', function() {
        var result = parse('0', 'D', baseDate, {
          useAdditionalDayOfYearTokens: true
        })
        assert(result instanceof Date && isNaN(result))
      })

      it('returns `Invalid Date` for 366th day of non-leap year', function() {
        var result = parse('366', 'D', new Date(2014, 1 /* Feb */, 1), {
          useAdditionalDayOfYearTokens: true
        })
        assert(result instanceof Date && isNaN(result))
      })

      it('parses 366th day of leap year', function() {
        var result = parse('366', 'D', new Date(2012, 1 /* Feb */, 1), {
          useAdditionalDayOfYearTokens: true
        })
        assert.deepEqual(result, new Date(2012, 11 /* Dec */, 31))
      })
    })

    describe('ISO day of week (formatting)', function() {
      it('returns `Invalid Date` for day zero', function() {
        var result = parse('0', 'i', baseDate)
        assert(result instanceof Date && isNaN(result))
      })

      it('returns `Invalid Date` for eight day of week', function() {
        var result = parse('8', 'i', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('local day of week (formatting)', function() {
      it('returns `Invalid Date` for day zero', function() {
        var result = parse('0', 'e', baseDate)
        assert(result instanceof Date && isNaN(result))
      })

      it('returns `Invalid Date` for eight day of week', function() {
        var result = parse('8', 'e', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('local day of week (stand-alone)', function() {
      it('returns `Invalid Date` for day zero', function() {
        var result = parse('0', 'c', baseDate)
        assert(result instanceof Date && isNaN(result))
      })

      it('returns `Invalid Date` for eight day of week', function() {
        var result = parse('8', 'c', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('hour [1-12]', function() {
      it('returns `Invalid Date` for hour zero', function() {
        var result = parse('00', 'hh', baseDate)
        assert(result instanceof Date && isNaN(result))
      })

      it('returns `Invalid Date` for invalid hour', function() {
        var result = parse('13', 'hh', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('hour [0-23]', function() {
      it('returns `Invalid Date` for invalid hour', function() {
        var result = parse('24', 'HH', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('hour [0-11]', function() {
      it('returns `Invalid Date` for invalid hour', function() {
        var result = parse('12', 'KK', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('hour [1-24]', function() {
      it('returns `Invalid Date` for hour zero', function() {
        var result = parse('00', 'kk', baseDate)
        assert(result instanceof Date && isNaN(result))
      })

      it('returns `Invalid Date` for invalid hour', function() {
        var result = parse('25', 'kk', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('minute', function() {
      it('returns `Invalid Date` for invalid minute', function() {
        var result = parse('60', 'mm', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })

    describe('second', function() {
      it('returns `Invalid Date` for invalid second', function() {
        var result = parse('60', 'ss', baseDate)
        assert(result instanceof Date && isNaN(result))
      })
    })
  })

  describe('custom locale', function() {
    it('allows to pass a custom locale', function() {
      var customLocale = {
        match: {
          era: function() {
            return {
              value: 0,
              rest: ' it works!'
            }
          }
        }
      }
      // $ExpectedMistake
      var result = parse('2018 foobar', "y G 'it works!'", baseDate, {
        locale: customLocale
      })
      assert.deepEqual(result, new Date(-2017, 0 /* Jan */, 1))
    })

    it('throws `RangeError` if `options.locale` does not contain `match` property', function() {
      var block = parse.bind(
        null,
        '2016-11-25 04 AM',
        'yyyy-MM-dd hh a',
        baseDate,
        // $ExpectedMistake
        { locale: {} }
      )
      assert.throws(block, RangeError)
    })
  })

  it('accepts a timestamp as `baseDate`', function() {
    var dateString = '6 p.m.'
    var formatString = 'h aaaa'
    var result = parse(dateString, formatString, baseDate.getTime())
    assert.deepEqual(result, new Date(1986, 3 /* Apr */, 4, 18))
  })

  it('does not mutate `baseDate`', function() {
    var baseDateClone1 = new Date(baseDate.getTime())
    var baseDateClone2 = new Date(baseDate.getTime())
    var dateString = '6 p.m.'
    var formatString = 'h aaaa'
    parse(dateString, formatString, baseDateClone1)
    assert.deepEqual(baseDateClone1, baseDateClone2)
  })

  describe('failure', function() {
    it('returns `baseDate` if `dateString` and `formatString` are empty strings', function() {
      var dateString = ''
      var formatString = ''
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, baseDate)
    })

    it('returns `baseDate` if no tokens in `formatString` are provided', function() {
      var dateString = 'not a token'
      var formatString = "'not a token'"
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, baseDate)
    })

    it("returns `Invalid Date`  if `formatString` doesn't match `dateString`", function() {
      var dateString = '2017-01-01'
      var formatString = 'yyyy/MM/dd'
      var result = parse(dateString, formatString, baseDate)
      assert(result instanceof Date && isNaN(result))
    })

    it('returns `Invalid Date`  if `formatString` tokens failed to parse a value', function() {
      var dateString = '2017-01-01'
      var formatString = 'MMMM do yyyy'
      var result = parse(dateString, formatString, baseDate)
      assert(result instanceof Date && isNaN(result))
    })

    it('returns `Invalid Date` if `formatString` is empty string but `dateString` is not', function() {
      var dateString = '2017-01-01'
      var formatString = ''
      var result = parse(dateString, formatString, baseDate)
      assert(result instanceof Date && isNaN(result))
    })

    it('returns `Invalid Date` if `baseDate` is `Invalid Date`', function() {
      var dateString = '2014-07-02T05:30:15.123+06:00'
      var formatString = "yyyy-MM-dd'T'HH:mm:ss.SSSxxx"
      var result = parse(dateString, formatString, new Date(NaN))
      assert(result instanceof Date && isNaN(result))
    })

    it('throws `RangeError` if `options.weekStartsOn` is not convertable to 0, 1, ..., 6 or undefined', function() {
      var dateString = '2014-07-02T05:30:15.123+06:00'
      var formatString = "yyyy-MM-dd'T'HH:mm:ss.SSSxxx"
      // $ExpectedMistake
      var block = parse.bind(null, dateString, formatString, baseDate, {
        weekStartsOn: NaN
      })
      assert.throws(block, RangeError)
    })

    it('throws `RangeError` if `options.firstWeekContainsDate` is not convertable to 1, 2, ..., 7 or undefined', function() {
      var dateString = '2014-07-02T05:30:15.123+06:00'
      var formatString = "yyyy-MM-dd'T'HH:mm:ss.SSSxxx"
      // $ExpectedMistake
      var block = parse.bind(null, dateString, formatString, baseDate, {
        firstWeekContainsDate: NaN
      })
      assert.throws(block, RangeError)
    })
  })

  it('throws TypeError exception if passed less than 3 arguments', function() {
    assert.throws(parse.bind(null), TypeError)
    // $ExpectedMistake
    assert.throws(parse.bind(null, 1), TypeError)
    // $ExpectedMistake
    assert.throws(parse.bind(null, 1, 2), TypeError)
  })

  describe('edge cases', function() {
    it('returns Invalid Date if the string contains some remaining input after parsing', function() {
      var result = parse('2016-11-05T040404', 'yyyy-MM-dd', baseDate)
      assert(result instanceof Date && isNaN(result))
    })

    it('parses normally if the remaining input is just whitespace', function() {
      var result = parse('2016-11-05   \n', 'yyyy-MM-dd', baseDate)
      assert.deepEqual(result, new Date(2016, 10 /* Nov */, 5))
    })

    it('throws RangeError exception if the format string contains an unescaped latin alphabet character', function() {
      assert.throws(
        parse.bind(null, '2016-11-05-nnnn', 'yyyy-MM-dd-nnnn', baseDate),
        RangeError
      )
    })
  })

  describe('useAdditionalWeekYearTokens and useAdditionalDayOfYearTokens options', () => {
    it('throws an error if D token is used', () => {
      const block = parse.bind(null, '2016-11-5', 'yyyy-MM-D', baseDate)
      assert.throws(block, RangeError)
      assert.throws(
        block,
        /Use `d` instead of `D` for formatting days of the month; see: https:\/\/git.io\/fxCyr/
      )
    })

    it('allows D token if useAdditionalDayOfYearTokens is set to true', () => {
      const result = parse('2016-11-5', 'yyyy-MM-D', new Date(1987, 1, 11), {
        useAdditionalDayOfYearTokens: true
      })
      assert.deepEqual(result, new Date(2016, 0, 5))
    })

    it('throws an error if DD token is used', () => {
      const block = parse.bind(null, '2016-11-05', 'yyyy-MM-DD', baseDate)
      assert.throws(block, RangeError)
      assert.throws(
        block,
        /Use `dd` instead of `DD` for formatting days of the month; see: https:\/\/git.io\/fxCyr/
      )
    })

    it('allows DD token if useAdditionalDayOfYearTokens is set to true', () => {
      const result = parse('2016-11-05', 'yyyy-MM-DD', new Date(1987, 1, 11), {
        useAdditionalDayOfYearTokens: true
      })
      assert.deepEqual(result, new Date(2016, 0, 5))
    })

    it('throws an error if YY token is used', () => {
      const block = parse.bind(null, '16-11-05', 'YY-MM-dd', baseDate)
      assert.throws(block, RangeError)
      assert.throws(
        block,
        /Use `yy` instead of `YY` for formatting years; see: https:\/\/git.io\/fxCyr/
      )
    })

    it('allows YY token if useAdditionalWeekYearTokens is set to true', () => {
      const result = parse('16-11-05', 'YY-MM-dd', new Date(1987, 1, 11), {
        useAdditionalWeekYearTokens: true
      })
      assert.deepEqual(result, new Date(2015, 10, 5))
    })

    it('throws an error if YYYY token is used', () => {
      const block = parse.bind(null, '2016-11-05', 'YYYY-MM-dd', baseDate)
      assert.throws(block, RangeError)
      assert.throws(
        block,
        /Use `yyyy` instead of `YYYY` for formatting years; see: https:\/\/git.io\/fxCyr/
      )
    })

    it('allows YYYY token if useAdditionalWeekYearTokens is set to true', () => {
      const result = parse('2016-11-05', 'YYYY-MM-dd', new Date(1987, 1, 11), {
        useAdditionalWeekYearTokens: true
      })
      assert.deepEqual(result, new Date(2015, 10, 5))
    })
  })

  describe('long format', function() {
    it('short date', function() {
      var expected = new Date(1995, 4 /* May */, 26)
      var dateString = '05/26/1995'
      var formatString = 'P'
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('medium date', function() {
      var expected = new Date(1995, 4 /* May */, 26)
      var dateString = 'May 26, 1995'
      var formatString = 'PP'
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('long date', function() {
      var expected = new Date(1995, 4 /* May */, 26)
      var dateString = 'May 26th, 1995'
      var formatString = 'PPP'
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('full date', function() {
      var expected = new Date(1995, 4 /* May */, 26)
      var dateString = 'Friday, May 26th, 1995'
      var formatString = 'PPPP'
      var result = parse(dateString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('short time', function() {
      var expected = new Date(
        baseDate.getFullYear(),
        baseDate.getMonth(),
        baseDate.getDate(),
        10,
        32
      )
      var timeString = '10:32 AM'
      var formatString = 'p'
      var result = parse(timeString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('medium time', function() {
      var expected = new Date(
        baseDate.getFullYear(),
        baseDate.getMonth(),
        baseDate.getDate(),
        10,
        32,
        55
      )
      var timeString = '10:32:55 AM'
      var formatString = 'pp'
      var result = parse(timeString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('short date + short time', function() {
      var expected = new Date(1995, 4 /* May */, 26, 10, 32)
      var dateTimeString = '05/26/1995, 10:32 AM'
      var formatString = 'Pp'
      var result = parse(dateTimeString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('medium date + short time', function() {
      var expected = new Date(1995, 4 /* May */, 26, 10, 32)
      var dateTimeString = 'May 26, 1995, 10:32 AM'
      var formatString = 'PPp'
      var result = parse(dateTimeString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('long date + short time', function() {
      var expected = new Date(1995, 4 /* May */, 26, 10, 32)
      var dateTimeString = 'May 26th, 1995 at 10:32 AM'
      var formatString = 'PPPp'
      var result = parse(dateTimeString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('full date + short time', function() {
      var expected = new Date(1995, 4 /* May */, 26, 10, 32)
      var dateTimeString = 'Friday, May 26th, 1995 at 10:32 AM'
      var formatString = 'PPPPp'
      var result = parse(dateTimeString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('short date + short time', function() {
      var expected = new Date(1995, 4 /* May */, 26, 10, 32, 55)
      var dateTimeString = '05/26/1995, 10:32:55 AM'
      var formatString = 'Ppp'
      var result = parse(dateTimeString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('medium date + short time', function() {
      var expected = new Date(1995, 4 /* May */, 26, 10, 32, 55)
      var dateTimeString = 'May 26, 1995, 10:32:55 AM'
      var formatString = 'PPpp'
      var result = parse(dateTimeString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('long date + short time', function() {
      var expected = new Date(1995, 4 /* May */, 26, 10, 32, 55)
      var dateTimeString = 'May 26th, 1995 at 10:32:55 AM'
      var formatString = 'PPPpp'
      var result = parse(dateTimeString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })

    it('full date + short time', function() {
      var expected = new Date(1995, 4 /* May */, 26, 10, 32, 55)
      var dateTimeString = 'Friday, May 26th, 1995 at 10:32:55 AM'
      var formatString = 'PPPPpp'
      var result = parse(dateTimeString, formatString, baseDate)
      assert.deepEqual(result, expected)
    })
  })
})