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7 collects. Also moves two pre-existing tests' dates off Oct 4-5, which now carry real sanctoral content (St. Francis, Ss. Placid and Companions) that changes their governing behavior -- same class of collision as previous months. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
51 lines
1.9 KiB
TypeScript
51 lines
1.9 KiB
TypeScript
import { describe, expect, it } from 'vitest';
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import { weekdayOf } from '../../src/calendar/weekday';
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import { resolveDay } from '../../src/calendar';
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describe('weekdayOf', () => {
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it('resolves a known Sunday', () => {
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// 2026-08-09 is a Sunday.
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expect(weekdayOf('2026-08-09')).toBe('sunday');
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});
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it('resolves each day of a full week correctly', () => {
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const expected = [
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['2026-08-09', 'sunday'],
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['2026-08-10', 'monday'],
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['2026-08-11', 'tuesday'],
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['2026-08-12', 'wednesday'],
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['2026-08-13', 'thursday'],
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['2026-08-14', 'friday'],
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['2026-08-15', 'saturday'],
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] as const;
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for (const [date, weekday] of expected) {
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expect(weekdayOf(date)).toBe(weekday);
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}
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});
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it('is not affected by the local timezone offset', () => {
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// Regression guard: resolving via `new Date(isoDate)` without pinning to
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// UTC would give different weekdays depending on the host's timezone.
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expect(weekdayOf('2026-01-01')).toBe('thursday');
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});
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});
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describe('resolveDay', () => {
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it('resolves a plain Sunday with no occurring feast', () => {
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// Not 2026-08-09 (also a Sunday): since the August sanctoral pull, that
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// date does carry a real commemoration (St. Romanus, impeded from
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// winning by the Vigil of St. Lawrence, itself impeded by the Sunday
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// and transferred away — see tests/calendar/transfer.test.ts, and
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// confirmed against the live reference engine, which shows the same
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// commemoration despite the vigil's own absence that day). Also not
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// 2026-10-04 (moved here from there): since the October pull, that
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// date is St. Francis's own day (Duplex), which wins outright even on
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// an ordinary Sunday.
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const day = resolveDay('2026-11-15');
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expect(day.date).toBe('2026-11-15');
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expect(day.weekday).toBe('sunday');
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expect(day.winner.kind).toBe('temporal');
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expect(day.commemorations).toEqual([]);
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});
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});
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