will
67037469fc
resolveDay() no longer hardcodes season: 'trinitytide'. Easter is computed via the Anonymous Gregorian algorithm (verified against 16 known reference dates spanning 1583-2100); Advent/Christmastide/ Epiphanytide follow the Christmas-anchored rules (including Advent's "Sunday nearest Nov 30"); Septuagesima through Trinitytide come from easter-offsets.yml, reshaped from single named anchor points into real ranges plus single-day overrides for Corpus Christi and Sacred Heart. occurring feasts (calendar/feasts.ts) are still a stub — the sanctoral calendar and Double-vs-not ranking are a separate, larger project.
33 lines
1.0 KiB
TypeScript
33 lines
1.0 KiB
TypeScript
import { describe, expect, it } from 'vitest';
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import { easterSunday } from '../../src/calendar/easter';
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import { toIsoDate } from '../../src/calendar/date-math';
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// Reference dates are public record (Western/Gregorian Easter Sunday),
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// spanning different centuries and both early and late extremes.
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const KNOWN_EASTER_DATES: Record<number, string> = {
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1583: '1583-04-10', // first year the Gregorian algorithm is valid
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1900: '1900-04-15',
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1954: '1954-04-18',
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2000: '2000-04-23',
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2019: '2019-04-21',
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2020: '2020-04-12',
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2021: '2021-04-04',
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2022: '2022-04-17',
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2023: '2023-04-09',
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2024: '2024-03-31', // one of the earliest possible dates
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2025: '2025-04-20',
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2026: '2026-04-05',
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2027: '2027-03-28',
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2028: '2028-04-16',
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2038: '2038-04-25', // one of the latest possible dates
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2100: '2100-03-28',
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};
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describe('easterSunday', () => {
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for (const [year, expected] of Object.entries(KNOWN_EASTER_DATES)) {
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it(`resolves ${year} to ${expected}`, () => {
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expect(toIsoDate(easterSunday(Number(year)))).toBe(expected);
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});
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}
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});
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