test(api): add domain layer unit tests across all modules

Cover admin events, notifications, reviews, search VOs, listings (property,
media, events, price/geo/address VOs), auth events, payment events,
subscription events, and analytics events. Raises domain test coverage
from ~24% to ~75%.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/modules/notifications/domain/__tests__/notifications-domain.spec.ts

@@ -0,0 +1,62 @@
+import { describe, it, expect } from 'vitest';
+import { NotificationSentEvent } from '../events/notification-sent.event';
+import { NotificationChannel, ALL_CHANNELS } from '../value-objects/notification-channel.vo';
+
+describe('Notifications Domain', () => {
+  describe('NotificationSentEvent', () => {
+    it('creates event with correct properties', () => {
+      const event = new NotificationSentEvent(
+        'notif-1',
+        'user-1',
+        NotificationChannel.EMAIL,
+        'listing_approved',
+      );
+
+      expect(event.eventName).toBe('notification.sent');
+      expect(event.aggregateId).toBe('notif-1');
+      expect(event.userId).toBe('user-1');
+      expect(event.channel).toBe('EMAIL');
+      expect(event.templateKey).toBe('listing_approved');
+      expect(event.occurredAt).toBeInstanceOf(Date);
+    });
+
+    it('creates event for PUSH channel', () => {
+      const event = new NotificationSentEvent(
+        'notif-2',
+        'user-2',
+        NotificationChannel.PUSH,
+        'payment_received',
+      );
+
+      expect(event.channel).toBe('PUSH');
+    });
+
+    it('creates event for SMS channel', () => {
+      const event = new NotificationSentEvent(
+        'notif-3',
+        'user-3',
+        NotificationChannel.SMS,
+        'kyc_approved',
+      );
+
+      expect(event.channel).toBe('SMS');
+    });
+  });
+
+  describe('NotificationChannel', () => {
+    it('defines all expected channels', () => {
+      expect(NotificationChannel.EMAIL).toBe('EMAIL');
+      expect(NotificationChannel.SMS).toBe('SMS');
+      expect(NotificationChannel.PUSH).toBe('PUSH');
+      expect(NotificationChannel.ZALO_OA).toBe('ZALO_OA');
+    });
+
+    it('ALL_CHANNELS contains all channel types', () => {
+      expect(ALL_CHANNELS).toHaveLength(4);
+      expect(ALL_CHANNELS).toContain('EMAIL');
+      expect(ALL_CHANNELS).toContain('SMS');
+      expect(ALL_CHANNELS).toContain('PUSH');
+      expect(ALL_CHANNELS).toContain('ZALO_OA');
+    });
+  });
+});