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Whichever of today/tomorrow doesn't govern a given evening's Vespers
can still be commemorated there, unless it's Simplex (or a bare
temporal winner with no standing of its own) — live-verified in both
directions against the real Monastic 1617 engine: Ss. Cyriacus/Largus/
Smaragdus (Semiduplex) commemorated when Sunday claims First Vespers
over them; St. Anne commemorated even though St. James (Duplex II.
classis) keeps his own Second Vespers outright; St. Donatus (Simplex)
gets nothing ("nihil de præcedenti") in the same situation Cyriacus/
etc. did get a commemoration. The isMajorFixedFeastOfTheLord override
(Christmas/Epiphany/Candlemas/Easter/Ascension/Corpus Christi/Sacred
Heart) deliberately doesn't inherit this yet — no live data on whether
those suppress it the way privileged-sunday/privileged-feria-major do
during the day.
Also fixes hasFirstVespers's threshold, found wrong while gathering
the above evidence: it required duplex-majus+, but Ss. Cyriacus/etc.
(plain Semiduplex) actually claims First Vespers over St. Donatus in
the live engine. Lowered to semiduplex, matching the sibling
privileged-feria-minor threshold already used just below it.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
76 lines
3.4 KiB
TypeScript
76 lines
3.4 KiB
TypeScript
import { describe, expect, it } from 'vitest';
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import { resolveEveningDay } from '../../src/calendar/vespers';
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describe('resolveEveningDay', () => {
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it('anticipates tomorrow when tomorrow is a Sunday and today is a plain feria (Saturday before Advent I)', () => {
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// Nov 30, 2025 is Advent I Sunday.
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const day = resolveEveningDay('2025-11-29');
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expect(day.date).toBe('2025-11-30');
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expect(day.season).toBe('advent');
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});
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it('does not anticipate between two plain ferias', () => {
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const day = resolveEveningDay('2026-06-16'); // Tuesday, ordinary trinitytide
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expect(day.date).toBe('2026-06-16');
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});
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it('anticipates Easter from Holy Saturday', () => {
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// Easter 2026 is Apr 5, so Holy Saturday is Apr 4.
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const day = resolveEveningDay('2026-04-04');
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expect(day.date).toBe('2026-04-05');
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expect(day.season).toBe('eastertide');
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});
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it("a Sunday always keeps its own Second Vespers, even before a higher-ranked weekday feast", () => {
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// Aug 10, 2026 (Monday) is St. Lawrence, Duplex II classis — well above
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// the "has First Vespers" threshold — but Sunday never cedes.
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const day = resolveEveningDay('2026-08-09');
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expect(day.date).toBe('2026-08-09');
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});
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it('an ordinary feria before a real high-ranked feast anticipates it', () => {
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// Aug 14, 2026 (Friday) is a plain feria; Aug 15 is the Assumption,
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// Duplex I classis.
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const day = resolveEveningDay('2026-08-14');
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expect(day.date).toBe('2026-08-15');
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expect(day.winner.kind).toBe('sanctoral');
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if (day.winner.kind === 'sanctoral') {
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expect(day.winner.id).toBe('assumption');
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expect(day.winner.vespersFrom).toBe('firstVespersOfTomorrow');
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}
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});
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// The three cases below are live-verified against the real Monastic
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// Tridentinum 1617 engine (see commemorationOf's own doc comment in
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// calendar/vespers.ts) — "commemoratio de præcedenti/sequenti" vs.
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// "nihil de præcedenti" in the raw output, not just inferred from the
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// daytime rule.
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it('a Semiduplex loser is still commemorated when tomorrow claims First Vespers', () => {
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// Aug 8, 2026 (Ss. Cyriacus/Largus/Smaragdus, Semiduplex) loses the
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// evening to Aug 9 (Sunday); still commemorated.
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const day = resolveEveningDay('2026-08-08');
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expect(day.date).not.toBe('2026-08-08');
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expect(day.commemorations).toContainEqual(
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expect.objectContaining({ kind: 'sanctoral', id: 'ss-cyriacus-largus-and-smaragdus' }),
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);
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});
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it('a Simplex loser is not commemorated when tomorrow claims First Vespers', () => {
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// Aug 7, 2026 (St. Donatus, Simplex) loses the evening to Aug 8
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// (Ss. Cyriacus/Largus/Smaragdus, now Semiduplex-threshold-eligible
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// for First Vespers — see hasFirstVespers); not commemorated.
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const day = resolveEveningDay('2026-08-07');
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expect(day.date).not.toBe('2026-08-07');
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expect(day.commemorations.some((c) => c.kind === 'sanctoral' && c.id === 'st-donatus')).toBe(false);
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});
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it('a winning day still commemorates a non-Simplex loser on the other side', () => {
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// Jul 25, 2026 (St. James the Greater, Duplex II. classis) keeps its
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// own Second Vespers outright, but still commemorates Jul 26
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// (St. Anne).
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const day = resolveEveningDay('2026-07-25');
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expect(day.date).toBe('2026-07-25');
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expect(day.commemorations).toContainEqual(expect.objectContaining({ kind: 'sanctoral', id: 'st-anne' }));
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});
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});
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