50 lines
1.8 KiB
JavaScript
50 lines
1.8 KiB
JavaScript
import { describe, it, expect } from 'vitest'
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import { fiscalWeek, fiscalWeekYear } from './fiscalWeek'
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/**
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* The number has to match what the classic ASP site shows, because people will
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* have both open. The awkward cases are all at the year boundary, which is
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* exactly where a naive "day of year / 7" gets it wrong.
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*/
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describe('fiscalWeek', () => {
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it('counts the week containing 4 January as week 1', () => {
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expect(fiscalWeek(new Date(2026, 0, 4))).toBe(1)
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})
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it('puts a late-December date in week 1 of the NEXT year', () => {
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// 2025-12-29 is a Monday; its Thursday falls in 2026, so it is 2026 week 1.
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expect(fiscalWeek(new Date(2025, 11, 29))).toBe(1)
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expect(fiscalWeekYear(new Date(2025, 11, 29))).toBe(2026)
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})
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it('puts an early-January date in the LAST week of the previous year', () => {
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// 2027-01-01 is a Friday; its Thursday is 2026-12-31, so it is 2026 week 53.
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expect(fiscalWeek(new Date(2027, 0, 1))).toBe(53)
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expect(fiscalWeekYear(new Date(2027, 0, 1))).toBe(2026)
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})
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it('holds the same number all week, Monday through Sunday', () => {
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const monday = new Date(2026, 7, 10)
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const week = fiscalWeek(monday)
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for (let i = 0; i < 7; i++) {
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const day = new Date(2026, 7, 10 + i)
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expect(fiscalWeek(day)).toBe(week)
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}
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})
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it('increments the following Monday', () => {
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expect(fiscalWeek(new Date(2026, 7, 17))).toBe(fiscalWeek(new Date(2026, 7, 10)) + 1)
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})
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it('gives a 53-week year its 53rd week', () => {
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// 2026 starts on a Thursday, so it runs to 53 weeks.
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expect(fiscalWeek(new Date(2026, 11, 31))).toBe(53)
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})
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it('is not fooled by a time of day', () => {
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const morning = new Date(2026, 7, 12, 6, 0, 0)
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const nearMidnight = new Date(2026, 7, 12, 23, 59, 0)
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expect(fiscalWeek(morning)).toBe(fiscalWeek(nearMidnight))
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})
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})
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