web-player: add Vitest, unit tests and pure queue operations

web-player/src/lib/server/greeting.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from 'vitest';
+import { pickGreeting } from './greeting';
+
+const BIRTHDAY = 'Hoy toca celebrar. Tú eliges la música.';
+
+describe('pickGreeting', () => {
+	it('uses the birthday message over special dates', () => {
+		const date = new Date(2026, 11, 25, 10);
+		expect(pickGreeting(date, { month: 12, day: 25 })).toBe(BIRTHDAY);
+	});
+	it('uses the special date message', () => {
+		expect(pickGreeting(new Date(2026, 11, 25, 10))).toBe('Feliz Navidad. Pon tu banda sonora.');
+	});
+	it('returns a non-empty schedule message at every hour', () => {
+		for (let hour = 0; hour < 24; hour++) {
+			expect(pickGreeting(new Date(2026, 2, 10, hour)).length).toBeGreaterThan(0);
+		}
+	});
+	it('ignores a birthday on another day', () => {
+		expect(pickGreeting(new Date(2026, 2, 10, 10), { month: 1, day: 2 })).not.toBe(BIRTHDAY);
+	});
+});