diff --git a/src/modules/quality/__tests__/inspection.service.spec.ts b/src/modules/quality/__tests__/inspection.service.spec.ts
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+++ b/src/modules/quality/__tests__/inspection.service.spec.ts
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+/**
+ * InspectionService Unit Tests
+ * Module: Quality
+ * Project: erp-construccion
+ */
+
+import { Repository } from 'typeorm';
+import { InspectionService, CreateInspectionDto, RecordResultDto } from '../services/inspection.service';
+import { Inspection, InspectionStatus } from '../entities/inspection.entity';
+import { InspectionResult } from '../entities/inspection-result.entity';
+import { NonConformity } from '../entities/non-conformity.entity';
+import { Checklist } from '../entities/checklist.entity';
+
+// Mock repositories
+const createMockRepository = <T>(): jest.Mocked<Repository<T>> => ({
+  create: jest.fn(),
+  save: jest.fn(),
+  findOne: jest.fn(),
+  find: jest.fn(),
+  delete: jest.fn(),
+  createQueryBuilder: jest.fn(),
+} as unknown as jest.Mocked<Repository<T>>);
+
+describe('InspectionService', () => {
+  let service: InspectionService;
+  let inspectionRepository: jest.Mocked<Repository<Inspection>>;
+  let resultRepository: jest.Mocked<Repository<InspectionResult>>;
+  let nonConformityRepository: jest.Mocked<Repository<NonConformity>>;
+  let checklistRepository: jest.Mocked<Repository<Checklist>>;
+
+  const mockTenantId = 'tenant-123';
+  const mockUserId = 'user-456';
+  const mockCtx = { tenantId: mockTenantId, userId: mockUserId };
+
+  const mockChecklist: Partial<Checklist> = {
+    id: 'checklist-1',
+    tenantId: mockTenantId,
+    name: 'Quality Checklist',
+    isActive: true,
+    deletedAt: null,
+    items: [
+      { id: 'item-1', isActive: true } as any,
+      { id: 'item-2', isActive: true } as any,
+    ],
+  };
+
+  const mockInspection: Partial<Inspection> = {
+    id: 'inspection-1',
+    tenantId: mockTenantId,
+    checklistId: 'checklist-1',
+    loteId: 'lote-1',
+    inspectionNumber: 'INS-2601-ABC123',
+    inspectionDate: new Date('2026-02-03'),
+    inspectorId: 'inspector-1',
+    status: 'pending' as InspectionStatus,
+    totalItems: 2,
+  };
+
+  beforeEach(() => {
+    inspectionRepository = createMockRepository<Inspection>();
+    resultRepository = createMockRepository<InspectionResult>();
+    nonConformityRepository = createMockRepository<NonConformity>();
+    checklistRepository = createMockRepository<Checklist>();
+
+    service = new InspectionService(
+      inspectionRepository,
+      resultRepository,
+      nonConformityRepository,
+      checklistRepository
+    );
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('create', () => {
+    const createDto: CreateInspectionDto = {
+      checklistId: 'checklist-1',
+      loteId: 'lote-1',
+      inspectionDate: new Date('2026-02-03'),
+      inspectorId: 'inspector-1',
+      notes: 'Test inspection',
+    };
+
+    it('should create inspection successfully', async () => {
+      checklistRepository.findOne.mockResolvedValue(mockChecklist as Checklist);
+      inspectionRepository.create.mockReturnValue(mockInspection as Inspection);
+      inspectionRepository.save.mockResolvedValue(mockInspection as Inspection);
+
+      const result = await service.create(mockCtx, createDto);
+
+      expect(checklistRepository.findOne).toHaveBeenCalledWith({
+        where: expect.objectContaining({
+          id: createDto.checklistId,
+          tenantId: mockTenantId,
+          isActive: true,
+          deletedAt: null,
+        }),
+        relations: ['items'],
+      });
+      expect(inspectionRepository.create).toHaveBeenCalledWith(
+        expect.objectContaining({
+          tenantId: mockTenantId,
+          checklistId: createDto.checklistId,
+          loteId: createDto.loteId,
+          status: 'pending',
+        })
+      );
+      expect(result).toEqual(mockInspection);
+    });
+
+    it('should throw error when checklist not found', async () => {
+      checklistRepository.findOne.mockResolvedValue(null);
+
+      await expect(service.create(mockCtx, createDto)).rejects.toThrow(
+        'Checklist not found or inactive'
+      );
+    });
+
+    it('should calculate total items from active checklist items', async () => {
+      checklistRepository.findOne.mockResolvedValue(mockChecklist as Checklist);
+      inspectionRepository.create.mockReturnValue(mockInspection as Inspection);
+      inspectionRepository.save.mockResolvedValue(mockInspection as Inspection);
+
+      await service.create(mockCtx, createDto);
+
+      expect(inspectionRepository.create).toHaveBeenCalledWith(
+        expect.objectContaining({
+          totalItems: 2,
+        })
+      );
+    });
+  });
+
+  describe('findById', () => {
+    it('should return inspection when found', async () => {
+      inspectionRepository.findOne.mockResolvedValue(mockInspection as Inspection);
+
+      const result = await service.findById(mockCtx, 'inspection-1');
+
+      expect(result).toEqual(mockInspection);
+      expect(inspectionRepository.findOne).toHaveBeenCalledWith({
+        where: { id: 'inspection-1', tenantId: mockTenantId },
+      });
+    });
+
+    it('should return null when inspection not found', async () => {
+      inspectionRepository.findOne.mockResolvedValue(null);
+
+      const result = await service.findById(mockCtx, 'non-existent');
+
+      expect(result).toBeNull();
+    });
+  });
+
+  describe('startInspection', () => {
+    it('should start pending inspection', async () => {
+      const pendingInspection = { ...mockInspection, status: 'pending' as InspectionStatus };
+      const startedInspection = { ...pendingInspection, status: 'in_progress' as InspectionStatus };
+
+      inspectionRepository.findOne.mockResolvedValue(pendingInspection as Inspection);
+      inspectionRepository.save.mockResolvedValue(startedInspection as Inspection);
+
+      const result = await service.startInspection(mockCtx, 'inspection-1');
+
+      expect(result?.status).toBe('in_progress');
+      expect(inspectionRepository.save).toHaveBeenCalled();
+    });
+
+    it('should throw error when inspection is not pending', async () => {
+      const inProgressInspection = { ...mockInspection, status: 'in_progress' as InspectionStatus };
+      inspectionRepository.findOne.mockResolvedValue(inProgressInspection as Inspection);
+
+      await expect(service.startInspection(mockCtx, 'inspection-1')).rejects.toThrow(
+        'Can only start pending inspections'
+      );
+    });
+
+    it('should return null when inspection not found', async () => {
+      inspectionRepository.findOne.mockResolvedValue(null);
+
+      const result = await service.startInspection(mockCtx, 'non-existent');
+
+      expect(result).toBeNull();
+    });
+  });
+
+  describe('recordResult', () => {
+    const resultDto: RecordResultDto = {
+      checklistItemId: 'item-1',
+      result: 'passed',
+      observations: 'Looks good',
+    };
+
+    it('should record passed result', async () => {
+      const inProgressInspection = { ...mockInspection, status: 'in_progress' as InspectionStatus };
+      const mockResult: Partial<InspectionResult> = {
+        id: 'result-1',
+        tenantId: mockTenantId,
+        inspectionId: 'inspection-1',
+        checklistItemId: 'item-1',
+        result: 'passed',
+      };
+
+      inspectionRepository.findOne.mockResolvedValue(inProgressInspection as Inspection);
+      resultRepository.findOne.mockResolvedValue(null);
+      resultRepository.create.mockReturnValue(mockResult as InspectionResult);
+      resultRepository.save.mockResolvedValue(mockResult as InspectionResult);
+
+      const result = await service.recordResult(mockCtx, 'inspection-1', resultDto);
+
+      expect(result.result).toBe('passed');
+      expect(nonConformityRepository.create).not.toHaveBeenCalled();
+    });
+
+    it('should create non-conformity when result is failed', async () => {
+      const failedDto: RecordResultDto = {
+        checklistItemId: 'item-1',
+        result: 'failed',
+        observations: 'Defect found',
+      };
+      const inProgressInspection = { ...mockInspection, status: 'in_progress' as InspectionStatus };
+      const mockResult: Partial<InspectionResult> = {
+        id: 'result-1',
+        result: 'failed',
+      };
+      const mockNC: Partial<NonConformity> = {
+        id: 'nc-1',
+        ncNumber: 'NC-2601-ABCD',
+        status: 'open',
+      };
+
+      inspectionRepository.findOne.mockResolvedValue(inProgressInspection as Inspection);
+      resultRepository.findOne.mockResolvedValue(null);
+      resultRepository.create.mockReturnValue(mockResult as InspectionResult);
+      resultRepository.save.mockResolvedValue(mockResult as InspectionResult);
+      nonConformityRepository.create.mockReturnValue(mockNC as NonConformity);
+      nonConformityRepository.save.mockResolvedValue(mockNC as NonConformity);
+
+      const result = await service.recordResult(mockCtx, 'inspection-1', failedDto);
+
+      expect(result.result).toBe('failed');
+      expect(nonConformityRepository.create).toHaveBeenCalledWith(
+        expect.objectContaining({
+          tenantId: mockTenantId,
+          inspectionId: 'inspection-1',
+          severity: 'minor',
+          status: 'open',
+        })
+      );
+    });
+
+    it('should update existing result instead of creating new', async () => {
+      const existingResult: Partial<InspectionResult> = {
+        id: 'result-1',
+        tenantId: mockTenantId,
+        inspectionId: 'inspection-1',
+        checklistItemId: 'item-1',
+        result: 'failed',
+      };
+      const inProgressInspection = { ...mockInspection, status: 'in_progress' as InspectionStatus };
+
+      inspectionRepository.findOne.mockResolvedValue(inProgressInspection as Inspection);
+      resultRepository.findOne.mockResolvedValue(existingResult as InspectionResult);
+      resultRepository.save.mockResolvedValue({ ...existingResult, result: 'passed' } as InspectionResult);
+
+      await service.recordResult(mockCtx, 'inspection-1', resultDto);
+
+      expect(resultRepository.create).not.toHaveBeenCalled();
+      expect(resultRepository.save).toHaveBeenCalled();
+    });
+
+    it('should throw error when inspection not found', async () => {
+      inspectionRepository.findOne.mockResolvedValue(null);
+
+      await expect(service.recordResult(mockCtx, 'non-existent', resultDto)).rejects.toThrow(
+        'Inspection not found'
+      );
+    });
+
+    it('should throw error when inspection is not in progress', async () => {
+      const pendingInspection = { ...mockInspection, status: 'pending' as InspectionStatus };
+      inspectionRepository.findOne.mockResolvedValue(pendingInspection as Inspection);
+
+      await expect(service.recordResult(mockCtx, 'inspection-1', resultDto)).rejects.toThrow(
+        'Can only record results for in-progress inspections'
+      );
+    });
+  });
+
+  describe('completeInspection', () => {
+    it('should complete inspection and calculate pass rate', async () => {
+      const inProgressInspection = {
+        ...mockInspection,
+        status: 'in_progress' as InspectionStatus,
+        results: [
+          { result: 'passed' },
+          { result: 'passed' },
+          { result: 'failed' },
+          { result: 'not_applicable' },
+        ],
+      };
+      const completedInspection = {
+        ...inProgressInspection,
+        status: 'completed' as InspectionStatus,
+        passedItems: 2,
+        failedItems: 1,
+        passRate: 66.67,
+      };
+
+      inspectionRepository.findOne.mockResolvedValue(inProgressInspection as Inspection);
+      inspectionRepository.save.mockResolvedValue(completedInspection as unknown as Inspection);
+
+      const result = await service.completeInspection(mockCtx, 'inspection-1');
+
+      expect(result?.status).toBe('completed');
+      expect(result?.passedItems).toBe(2);
+      expect(result?.failedItems).toBe(1);
+      expect(inspectionRepository.save).toHaveBeenCalled();
+    });
+
+    it('should throw error when inspection is not in progress', async () => {
+      const pendingInspection = { ...mockInspection, status: 'pending' as InspectionStatus };
+      inspectionRepository.findOne.mockResolvedValue(pendingInspection as Inspection);
+
+      await expect(service.completeInspection(mockCtx, 'inspection-1')).rejects.toThrow(
+        'Can only complete in-progress inspections'
+      );
+    });
+  });
+
+  describe('approveInspection', () => {
+    it('should approve completed inspection without critical NCs', async () => {
+      const completedInspection = {
+        ...mockInspection,
+        status: 'completed' as InspectionStatus,
+        nonConformities: [
+          { severity: 'minor', status: 'verified' },
+        ],
+      };
+      const approvedInspection = {
+        ...completedInspection,
+        status: 'approved' as InspectionStatus,
+        approvedById: mockUserId,
+      };
+
+      inspectionRepository.findOne.mockResolvedValue(completedInspection as unknown as Inspection);
+      inspectionRepository.save.mockResolvedValue(approvedInspection as unknown as Inspection);
+
+      const result = await service.approveInspection(mockCtx, 'inspection-1');
+
+      expect(result?.status).toBe('approved');
+      expect(result?.approvedById).toBe(mockUserId);
+    });
+
+    it('should throw error when critical NCs are open', async () => {
+      const completedInspection = {
+        ...mockInspection,
+        status: 'completed' as InspectionStatus,
+        nonConformities: [
+          { severity: 'critical', status: 'open' },
+        ],
+      };
+
+      inspectionRepository.findOne.mockResolvedValue(completedInspection as unknown as Inspection);
+
+      await expect(service.approveInspection(mockCtx, 'inspection-1')).rejects.toThrow(
+        'Cannot approve inspection with open critical non-conformities'
+      );
+    });
+
+    it('should throw error when inspection is not completed', async () => {
+      const inProgressInspection = { ...mockInspection, status: 'in_progress' as InspectionStatus };
+      inspectionRepository.findOne.mockResolvedValue(inProgressInspection as Inspection);
+
+      await expect(service.approveInspection(mockCtx, 'inspection-1')).rejects.toThrow(
+        'Can only approve completed inspections'
+      );
+    });
+  });
+
+  describe('rejectInspection', () => {
+    it('should reject completed inspection with reason', async () => {
+      const completedInspection = {
+        ...mockInspection,
+        status: 'completed' as InspectionStatus,
+      };
+      const rejectedInspection = {
+        ...completedInspection,
+        status: 'rejected' as InspectionStatus,
+        rejectionReason: 'Does not meet standards',
+      };
+
+      inspectionRepository.findOne.mockResolvedValue(completedInspection as Inspection);
+      inspectionRepository.save.mockResolvedValue(rejectedInspection as unknown as Inspection);
+
+      const result = await service.rejectInspection(mockCtx, 'inspection-1', 'Does not meet standards');
+
+      expect(result?.status).toBe('rejected');
+      expect(result?.rejectionReason).toBe('Does not meet standards');
+    });
+
+    it('should throw error when inspection is not completed', async () => {
+      const inProgressInspection = { ...mockInspection, status: 'in_progress' as InspectionStatus };
+      inspectionRepository.findOne.mockResolvedValue(inProgressInspection as Inspection);
+
+      await expect(service.rejectInspection(mockCtx, 'inspection-1', 'reason')).rejects.toThrow(
+        'Can only reject completed inspections'
+      );
+    });
+
+    it('should return null when inspection not found', async () => {
+      inspectionRepository.findOne.mockResolvedValue(null);
+
+      const result = await service.rejectInspection(mockCtx, 'non-existent', 'reason');
+
+      expect(result).toBeNull();
+    });
+  });
+
+  describe('findWithFilters', () => {
+    it('should return paginated results with filters', async () => {
+      const mockQueryBuilder = {
+        leftJoinAndSelect: jest.fn().mockReturnThis(),
+        where: jest.fn().mockReturnThis(),
+        andWhere: jest.fn().mockReturnThis(),
+        orderBy: jest.fn().mockReturnThis(),
+        skip: jest.fn().mockReturnThis(),
+        take: jest.fn().mockReturnThis(),
+        getManyAndCount: jest.fn().mockResolvedValue([[mockInspection], 1]),
+      };
+
+      inspectionRepository.createQueryBuilder.mockReturnValue(mockQueryBuilder as any);
+
+      const result = await service.findWithFilters(
+        mockCtx,
+        { status: 'pending' as InspectionStatus },
+        1,
+        20
+      );
+
+      expect(result.data).toHaveLength(1);
+      expect(result.total).toBe(1);
+      expect(result.page).toBe(1);
+      expect(result.limit).toBe(20);
+      expect(mockQueryBuilder.andWhere).toHaveBeenCalledWith('insp.status = :status', { status: 'pending' });
+    });
+  });
+});