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__tests__/lib/utils/datetime.test.ts

@@ -0,0 +1,52 @@
+import {
+  formatDuration,
+  parseDuration,
+} from '../../../src/lib/utils/datetime';
+
+describe('DateTime Utils', () => {
+  describe('formatDuration', () => {
+    it('formats minutes to h:mm', () => {
+      expect(formatDuration(60)).toBe('1:00');
+      expect(formatDuration(90)).toBe('1:30');
+      expect(formatDuration(125)).toBe('2:05');
+      expect(formatDuration(600)).toBe('10:00');
+    });
+
+    it('handles zero minutes', () => {
+      expect(formatDuration(0)).toBe('0:00');
+    });
+
+    it('handles less than 60 minutes', () => {
+      expect(formatDuration(45)).toBe('0:45');
+      expect(formatDuration(5)).toBe('0:05');
+    });
+  });
+
+  describe('parseDuration', () => {
+    it('parses h:mm to minutes', () => {
+      expect(parseDuration('1:00')).toBe(60);
+      expect(parseDuration('1:30')).toBe(90);
+      expect(parseDuration('2:05')).toBe(125);
+      expect(parseDuration('10:00')).toBe(600);
+    });
+
+    it('returns null for invalid format', () => {
+      expect(parseDuration('1:5')).toBeNull(); // missing leading zero
+      expect(parseDuration('abc')).toBeNull();
+      expect(parseDuration('1:60')).toBeNull(); // invalid minutes
+    });
+
+    it('handles zero duration', () => {
+      expect(parseDuration('0:00')).toBe(0);
+    });
+  });
+
+  describe('roundtrip conversion', () => {
+    it('format and parse roundtrip correctly', () => {
+      const minutes = 125;
+      const formatted = formatDuration(minutes);
+      const parsed = parseDuration(formatted);
+      expect(parsed).toBe(minutes);
+    });
+  });
+});