1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
import MockDate from 'mockdate'import moment from 'moment'import dayjs from '../../src'import es from '../../src/locale/es'import znCn from '../../src/locale/zh-cn'import localizedFormat from '../../src/plugin/localizedFormat'
dayjs.extend(localizedFormat)
beforeEach(() => {  MockDate.set(new Date())})
afterEach(() => {  MockDate.reset()})
it('Declares English localized formats', () => {  expect(dayjs.en).toBeDefined()  expect(dayjs.en.formats).toBeDefined();  ['LT', 'LTS', 'L', 'LL', 'LLL', 'LLLL'].forEach(option =>    expect(dayjs.en.formats[option]).toBeDefined())})
it('Should not interpolate characters inside square brackets', () => {  const date = new Date(0)  const actualDate = dayjs(date)  const expectedDate = moment(date)
  expect(actualDate.format('[l]')).toBe('l')  expect(actualDate.format('YYYY [l] YYYY')).toBe('1970 l 1970')  expect(actualDate.format('l [l] l')).toBe('1/1/1970 l 1/1/1970')  expect(actualDate.format('[L LL LLL LLLL]')).toBe(expectedDate.format('[L LL LLL LLLL]'))

  const localeFormats = {    L: '[MMMM MM DD dddd]'  }  const mockedDayJsLocale = {    ...es,    name: 'fake-locale',    formats: {      ...localeFormats    }  }  const fakeDate = dayjs(date, { locale: mockedDayJsLocale })
  expect(fakeDate.locale('fake-locale').format('l')).toEqual('MMMM MM DD dddd')})
it('Recognizes localized format options', () => {  const { formats } = dayjs.en  const date = dayjs();  ['LT', 'LTS', 'L', 'LL', 'LLL', 'LLLL'].forEach(option =>    expect(date.format(option)).toBe(date.format(formats[option])))})
it('Uses correct English formats', () => {  const date = new Date()  const actualDate = dayjs(date)  const expectedDate = moment(date);  ['LT', 'LTS', 'L', 'LL', 'LLL', 'LLLL'].forEach(option =>    expect(actualDate.format(option)).toBe(expectedDate.format(option)))})
it('Uses English formats in other locales as default', () => {  const date = new Date()  const actualDate = dayjs(date)  const expectedDate = moment(date)  const mockLocale = {    name: 'mock',    weekdays: Array(7).fill(' '),    months: Array(12).fill(' ')  }  expect(actualDate.locale(mockLocale).format('L')).toBe(expectedDate.format('L'))})
it('Leaves the default format intact', () => {  const date = new Date()  const actualDate = dayjs(date)  const expectedDate = moment(date)  expect(actualDate.format()).toBe(expectedDate.format())})
it('Uses the locale of the dayjs instance', () => {  const date = new Date()  const englishDate = dayjs(date)  const spanishDate = dayjs(date, { locale: es })  expect(englishDate.format('L LTS')).not.toBe(spanishDate.format('L LTS'))})

it('Uses the localized lowercase formats if defined', () => {  const date = new Date()  const znDate = dayjs(date, { locale: znCn });  ['l', 'll', 'lll', 'llll'].forEach(option => expect(znDate.format(option)).toBe(znDate.format(znCn.formats[option])))})
it('Uses fallback to xx if xx-yy not available', () => {  expect(dayjs('2019-02-01').locale('en-yy').format('MMMM'))    .toBe('February')})
it('Uses xx-yy if xx-YY is provided', () => {  expect(dayjs('2019-02-01').locale('es-US').format('MMMM'))    .toBe('febrero')})
it('Uses the localized uppercase formats as a base for lowercase formats, if not defined', () => {  const date = new Date()  const spanishDate = dayjs(date, { locale: es });
  ['l', 'll', 'lll', 'llll'].forEach((option) => {    const upperCaseFormat = es.formats[option.toUpperCase()]    const adaptedFormat = upperCaseFormat.replace(/(\[[^\]]+])|(MMMM|MM|DD|dddd)/g, (_, a, b) => a || b.slice(1))    expect(spanishDate.format(option)).toBe(spanishDate.format(adaptedFormat))  })})