65 lines
2.2 KiB
TypeScript
65 lines
2.2 KiB
TypeScript
import { describe, it, expect } from 'vitest';
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import { formatLocalTime, isValidTimezone, resolveTimezone } from './timezone.js';
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// --- formatLocalTime ---
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describe('formatLocalTime', () => {
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it('converts UTC to local time display', () => {
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// 2026-02-04T18:30:00Z in America/New_York (EST, UTC-5) = 1:30 PM
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const result = formatLocalTime('2026-02-04T18:30:00.000Z', 'America/New_York');
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expect(result).toContain('1:30');
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expect(result).toContain('PM');
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expect(result).toContain('Feb');
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expect(result).toContain('2026');
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});
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it('handles different timezones', () => {
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// Same UTC time should produce different local times
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const utc = '2026-06-15T12:00:00.000Z';
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const ny = formatLocalTime(utc, 'America/New_York');
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const tokyo = formatLocalTime(utc, 'Asia/Tokyo');
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// NY is UTC-4 in summer (EDT), Tokyo is UTC+9
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expect(ny).toContain('8:00');
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expect(tokyo).toContain('9:00');
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});
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it('does not throw on invalid timezone, falls back to UTC', () => {
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expect(() => formatLocalTime('2026-01-01T00:00:00.000Z', 'IST-2')).not.toThrow();
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const result = formatLocalTime('2026-01-01T12:00:00.000Z', 'IST-2');
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// Should format as UTC (noon UTC = 12:00 PM)
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expect(result).toContain('12:00');
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expect(result).toContain('PM');
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});
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});
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describe('isValidTimezone', () => {
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it('accepts valid IANA identifiers', () => {
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expect(isValidTimezone('America/New_York')).toBe(true);
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expect(isValidTimezone('UTC')).toBe(true);
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expect(isValidTimezone('Asia/Tokyo')).toBe(true);
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expect(isValidTimezone('Asia/Jerusalem')).toBe(true);
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});
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it('rejects invalid timezone strings', () => {
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expect(isValidTimezone('IST-2')).toBe(false);
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expect(isValidTimezone('XYZ+3')).toBe(false);
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});
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it('rejects empty and garbage strings', () => {
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expect(isValidTimezone('')).toBe(false);
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expect(isValidTimezone('NotATimezone')).toBe(false);
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});
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});
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describe('resolveTimezone', () => {
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it('returns the timezone if valid', () => {
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expect(resolveTimezone('America/New_York')).toBe('America/New_York');
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});
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it('falls back to UTC for invalid timezone', () => {
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expect(resolveTimezone('IST-2')).toBe('UTC');
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expect(resolveTimezone('')).toBe('UTC');
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});
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});
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