a52d481a8e
The correspondence timeline labels each row with its distance from today
("vor 86 Jahren"). Uses calendar-field math so the anniversary day
flips exactly — an ms-based 365.25d average misses by a day on leap
years. Invalid / future dates return "" so the caller can hide the
label rather than print "vor 0 Jahren".
Refs #305
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
70 lines
2.4 KiB
TypeScript
70 lines
2.4 KiB
TypeScript
import { describe, it, expect } from 'vitest';
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import { relativeTimeDe, relativeYearsDe } from './relativeTime';
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const NOW = new Date('2026-04-20T12:00:00Z');
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describe('relativeTimeDe', () => {
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it('returns minutes for a gap under one hour', () => {
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const from = new Date('2026-04-20T11:58:00Z');
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expect(relativeTimeDe(from, NOW)).toContain('2');
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expect(relativeTimeDe(from, NOW)).toMatch(/Minute/i);
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});
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it('returns hours for a gap between 1 and 24 hours', () => {
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const from = new Date('2026-04-20T09:00:00Z');
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expect(relativeTimeDe(from, NOW)).toContain('3');
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expect(relativeTimeDe(from, NOW)).toMatch(/Stunde/i);
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});
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it('returns days for a gap of 24 hours or more', () => {
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const from = new Date('2026-04-18T12:00:00Z');
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expect(relativeTimeDe(from, NOW)).toContain('2');
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expect(relativeTimeDe(from, NOW)).toMatch(/Tag/i);
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});
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it('rounds minutes to the nearest whole number', () => {
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const from = new Date('2026-04-20T11:58:20Z');
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expect(relativeTimeDe(from, NOW)).toContain('2');
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});
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it('handles zero gap as 0 minutes', () => {
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expect(relativeTimeDe(NOW, NOW)).toMatch(/0/);
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expect(relativeTimeDe(NOW, NOW)).toMatch(/Minute/i);
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});
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it('falls back to 0 minutes when the input Date is invalid', () => {
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const invalid = new Date('not-a-real-date');
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// Never crash the UI if the backend ever ships a malformed uploadedAt.
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expect(relativeTimeDe(invalid, NOW)).toMatch(/0/);
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expect(relativeTimeDe(invalid, NOW)).toMatch(/Minute/i);
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});
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});
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describe('relativeYearsDe', () => {
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it('returns singular "vor 1 Jahr" for exactly one whole year ago', () => {
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const from = new Date('2025-04-20T12:00:00Z');
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expect(relativeYearsDe(from, NOW)).toBe('vor 1 Jahr');
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});
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it('returns plural "vor N Jahren" for more than one year', () => {
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const from = new Date('1940-04-20T12:00:00Z');
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expect(relativeYearsDe(from, NOW)).toBe('vor 86 Jahren');
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});
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it('floors a partial year down (eleven months ago = 0 years)', () => {
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const from = new Date('2025-06-01T00:00:00Z');
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// We show "vor weniger als 1 Jahr" rather than rounding up to 1.
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expect(relativeYearsDe(from, NOW)).toBe('vor weniger als 1 Jahr');
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});
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it('returns empty string when the input Date is invalid', () => {
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const invalid = new Date('not-a-real-date');
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expect(relativeYearsDe(invalid, NOW)).toBe('');
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});
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it('returns empty string for future dates', () => {
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const future = new Date('2030-01-01T00:00:00Z');
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expect(relativeYearsDe(future, NOW)).toBe('');
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});
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});
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