fix(occupancies): assign room resources during transfers

apps/server/src/occupancies/dto/occupancy.dto.spec.ts

@@ -0,0 +1,28 @@
+import { validate } from 'class-validator';
+import { CheckInDto, TransferRoomDto } from './occupancy.dto';
+
+describe('manual occupancy DTO bed requirements', () => {
+  it('requires a bed for manual check-in', async () => {
+    const dto = Object.assign(new CheckInDto(), {
+      studentId: 1,
+      roomId: 2,
+      checkInDate: '2026-07-13',
+    });
+
+    const errors = await validate(dto);
+
+    expect(errors.some((error) => error.property === 'bedId')).toBe(true);
+  });
+
+  it('requires a new bed for a room transfer while keeping the locker optional', async () => {
+    const dto = Object.assign(new TransferRoomDto(), {
+      newRoomId: 3,
+      transferDate: '2026-07-13',
+    });
+
+    const errors = await validate(dto);
+
+    expect(errors.some((error) => error.property === 'newBedId')).toBe(true);
+    expect(errors.some((error) => error.property === 'newLockerId')).toBe(false);
+  });
+});