more unit test fixes + some integration

src/routes/admin.users.routes.test.ts

@@ -97,6 +97,13 @@ describe('Admin User Management Routes (/api/admin/users)', () => {
       expect(response.body).toEqual(mockUsers);
       expect(adminRepo.getAllUsers).toHaveBeenCalledTimes(1);
     });
+
+    it('should return 500 if the database call fails', async () => {
+      const dbError = new Error('DB Error');
+      vi.mocked(adminRepo.getAllUsers).mockRejectedValue(dbError);
+      const response = await supertest(app).get('/api/admin/users');
+      expect(response.status).toBe(500);
+    });
   });
 
   describe('GET /users/:id', () => {
@@ -116,6 +123,13 @@ describe('Admin User Management Routes (/api/admin/users)', () => {
       expect(response.status).toBe(404);
       expect(response.body.message).toBe('User not found.');
     });
+
+    it('should return 500 on a generic database error', async () => {
+      const dbError = new Error('DB Error');
+      vi.mocked(userRepo.findUserProfileById).mockRejectedValue(dbError);
+      const response = await supertest(app).get(`/api/admin/users/${userId}`);
+      expect(response.status).toBe(500);
+    });
   });
 
   describe('PUT /users/:id', () => {
@@ -141,6 +155,14 @@ describe('Admin User Management Routes (/api/admin/users)', () => {
       expect(response.body.message).toBe(`User with ID ${missingId} not found.`);
     });
 
+    it('should return 500 on a generic database error', async () => {
+      const dbError = new Error('DB Error');
+      vi.mocked(adminRepo.updateUserRole).mockRejectedValue(dbError);
+      const response = await supertest(app).put(`/api/admin/users/${userId}`).send({ role: 'admin' });
+      expect(response.status).toBe(500);
+      expect(response.body.message).toBe('DB Error');
+    });
+
     it('should return 400 for an invalid role', async () => {
       const response = await supertest(app)
         .put(`/api/admin/users/${userId}`)
@@ -164,5 +186,13 @@ describe('Admin User Management Routes (/api/admin/users)', () => {
       expect(response.body.message).toMatch(/Admins cannot delete their own account/);
       expect(userRepo.deleteUserById).not.toHaveBeenCalled();
     });
+
+    it('should return 500 on a generic database error', async () => {
+      const targetId = '123e4567-e89b-12d3-a456-426614174999';
+      const dbError = new Error('DB Error');
+      vi.mocked(userRepo.deleteUserById).mockRejectedValue(dbError);
+      const response = await supertest(app).delete(`/api/admin/users/${targetId}`);
+      expect(response.status).toBe(500);
+    });
   });
 });