add tests for date.

tests/unit/helpers/date.test.ts

@@ -1,4 +1,5 @@
 import '@testing-library/jest-dom';
+import type { WeekDay } from '$lib/helpers/date';
 import {
     toLocaleDate,
     toLocaleDateTime,
@@ -6,7 +7,9 @@ import {
     isValidDate,
     diffDays,
     toLocaleDateISO,
-    toLocaleTimeISO
+    toLocaleTimeISO,
+    utcHourToLocaleHour,
+    utcWeekDayToLocaleWeekDay
 } from '$lib/helpers/date';
 
 describe('local date', () => {
@@ -121,3 +124,35 @@ describe('diff days', () => {
         });
     });
 });
+
+describe('utc hour to local hour', () => {
+    const entries: Array<[string, string]> = [
+        ['09:00', '04:00'],
+        ['10:45', '05:45'],
+        ['11:59', '06:59'],
+        ['17:00', '12:00'],
+        ['22:36', '17:36']
+    ];
+
+    entries.forEach(([value, expected]) => {
+        it(value, () => {
+            expect(utcHourToLocaleHour(value)).toBe(expected);
+        });
+    });
+});
+
+describe('utc week day to local week day', () => {
+    const entries: Array<[WeekDay, string, string]> = [
+        ['Sunday', '00:00', 'Sat'],
+        ['Sunday', '22:00', 'Sun'],
+        ['Wednesday', '13:00', 'Wed'],
+        ['Friday', '23:59', 'Fri'],
+        ['Saturday', '10:00', 'Sat']
+    ];
+
+    entries.forEach(([weekDay, utcTimeString, expected]) => {
+        it(`${weekDay} ${utcTimeString}`, () => {
+            expect(utcWeekDayToLocaleWeekDay(weekDay, utcTimeString)).toBe(expected);
+        });
+    });
+});