diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index eb067e3..5bcbd44 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -26,14 +26,31 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: '22'
-          cache: 'npm'
-          cache-dependency-path: './backend/package.json'
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+          run_install: false
+
+      - name: Get pnpm store directory
+        shell: bash
+        run: |
+          echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
+
+      - name: Setup pnpm cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ env.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
 
       - name: Install dependencies
-        run: npm ci
+        run: pnpm install
 
       - name: Run tests
-        run: npm test -- --coverage
+        run: pnpm test -- --coverage
 
       - name: Upload results to Codecov
         uses: codecov/codecov-action@v4
diff --git a/backend/src/services/services.service.spec.ts b/backend/src/services/services.service.spec.ts
new file mode 100644
index 0000000..c134e71
--- /dev/null
+++ b/backend/src/services/services.service.spec.ts
@@ -0,0 +1,115 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { getRepositoryToken } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { ServicesService } from './services.service';
+import { Service } from './entities/service.entity';
+import { NotFoundException } from '@nestjs/common';
+
+describe('ServicesService', () => {
+  let service: ServicesService;
+  let serviceRepository: Repository<Service>;
+
+  const mockService = {
+    id: 'service-1',
+    name: 'Haircut',
+    description: 'Basic haircut service',
+    duration: 60,
+    price: 50,
+  };
+
+  const mockServiceRepository = {
+    findOne: jest.fn(),
+    find: jest.fn(),
+  };
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        ServicesService,
+        {
+          provide: getRepositoryToken(Service),
+          useValue: mockServiceRepository,
+        },
+      ],
+    }).compile();
+
+    service = module.get<ServicesService>(ServicesService);
+    serviceRepository = module.get<Repository<Service>>(getRepositoryToken(Service));
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+
+  describe('findOne', () => {
+    it('should return a service when found', async () => {
+      mockServiceRepository.findOne.mockResolvedValue(mockService);
+
+      const result = await service.findOne('service-1');
+      expect(result).toEqual(mockService);
+      expect(serviceRepository.findOne).toHaveBeenCalledWith({
+        where: { id: 'service-1' },
+      });
+    });
+
+    it('should throw NotFoundException when service not found', async () => {
+      mockServiceRepository.findOne.mockResolvedValue(null);
+
+      await expect(service.findOne('non-existent')).rejects.toThrow(
+        NotFoundException,
+      );
+    });
+  });
+
+  describe('findAll', () => {
+    it('should return all services', async () => {
+      const mockServices = [mockService];
+      mockServiceRepository.find.mockResolvedValue(mockServices);
+
+      const result = await service.findAll();
+      expect(result).toEqual(mockServices);
+      expect(serviceRepository.find).toHaveBeenCalled();
+    });
+
+    it('should return empty array when no services exist', async () => {
+      mockServiceRepository.find.mockResolvedValue([]);
+
+      const result = await service.findAll();
+      expect(result).toEqual([]);
+      expect(serviceRepository.find).toHaveBeenCalled();
+    });
+  });
+
+  describe('findByEmployee', () => {
+    it('should return services for an employee', async () => {
+      const mockServices = [mockService];
+      mockServiceRepository.find.mockResolvedValue(mockServices);
+
+      const result = await service.findByEmployee('employee-1');
+      expect(result).toEqual(mockServices);
+      expect(serviceRepository.find).toHaveBeenCalledWith({
+        where: {
+          employees: {
+            id: 'employee-1',
+          },
+        },
+        relations: ['employees'],
+      });
+    });
+
+    it('should return empty array when employee has no services', async () => {
+      mockServiceRepository.find.mockResolvedValue([]);
+
+      const result = await service.findByEmployee('employee-1');
+      expect(result).toEqual([]);
+      expect(serviceRepository.find).toHaveBeenCalledWith({
+        where: {
+          employees: {
+            id: 'employee-1',
+          },
+        },
+        relations: ['employees'],
+      });
+    });
+  });
+});