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backend/src/features/maintenance/tests/fixtures/maintenance.fixtures.json

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+{
+  "validMaintenanceOilChange": {
+    "vehicleId": "550e8400-e29b-41d4-a716-446655440000",
+    "type": "oil_change",
+    "category": "routine_maintenance",
+    "description": "Regular oil and filter change",
+    "dueDate": "2024-04-01",
+    "dueMileage": 55000,
+    "completedDate": null,
+    "completedMileage": null,
+    "cost": 45.99,
+    "serviceLocation": "Joe's Auto Service",
+    "notes": "Use synthetic 5W-30",
+    "isCompleted": false
+  },
+  "validMaintenanceTireRotation": {
+    "vehicleId": "550e8400-e29b-41d4-a716-446655440000",
+    "type": "tire_rotation",
+    "category": "routine_maintenance",
+    "description": "Rotate all four tires",
+    "dueDate": "2024-03-15",
+    "dueMileage": 53000,
+    "completedDate": "2024-03-10",
+    "completedMileage": 52500,
+    "cost": 35.0,
+    "serviceLocation": "Discount Tire",
+    "notes": "Tires in good condition",
+    "isCompleted": true
+  },
+  "validMaintenanceBrakeService": {
+    "vehicleId": "550e8400-e29b-41d4-a716-446655440001",
+    "type": "brake_service",
+    "category": "repair",
+    "description": "Replace brake pads and rotors",
+    "dueDate": "2024-02-20",
+    "dueMileage": 54000,
+    "completedDate": "2024-02-18",
+    "completedMileage": 53800,
+    "cost": 350.0,
+    "serviceLocation": "Mike's Brake Shop",
+    "notes": "Front and rear pads replaced",
+    "isCompleted": true
+  },
+  "validMaintenanceUpgrade": {
+    "vehicleId": "550e8400-e29b-41d4-a716-446655440000",
+    "type": "exhaust_upgrade",
+    "category": "performance_upgrade",
+    "description": "Performance exhaust system installation",
+    "dueDate": null,
+    "dueMileage": null,
+    "completedDate": "2024-01-20",
+    "completedMileage": 51500,
+    "cost": 1200.0,
+    "serviceLocation": "Performance Auto",
+    "notes": "Custom exhaust system installed",
+    "isCompleted": true
+  },
+  "maintenanceWithoutDueDate": {
+    "vehicleId": "550e8400-e29b-41d4-a716-446655440000",
+    "type": "inspection",
+    "category": "routine_maintenance",
+    "description": "Annual vehicle inspection",
+    "dueDate": null,
+    "dueMileage": null,
+    "completedDate": null,
+    "completedMileage": null,
+    "cost": 150.0,
+    "serviceLocation": "State Inspection Center",
+    "notes": "Required for registration",
+    "isCompleted": false
+  },
+  "invalidMaintenancePastDueDate": {
+    "vehicleId": "550e8400-e29b-41d4-a716-446655440000",
+    "type": "oil_change",
+    "category": "routine_maintenance",
+    "description": "Oil change overdue",
+    "dueDate": "2024-01-01",
+    "dueMileage": 51000,
+    "completedDate": null,
+    "completedMileage": null,
+    "cost": 45.99,
+    "serviceLocation": "Joe's Auto Service",
+    "notes": "OVERDUE - Schedule immediately",
+    "isCompleted": false
+  },
+  "invalidMaintenanceInvalidCategory": {
+    "vehicleId": "550e8400-e29b-41d4-a716-446655440000",
+    "type": "custom_work",
+    "category": "invalid_category",
+    "description": "Custom work",
+    "dueDate": null,
+    "dueMileage": null,
+    "completedDate": null,
+    "completedMileage": null,
+    "cost": 0,
+    "serviceLocation": "Unknown",
+    "notes": null,
+    "isCompleted": false
+  },
+  "maintenanceScheduleResponse": {
+    "id": "f47ac10b-58cc-4372-a567-0e02b2c3d479",
+    "userId": "auth0|user123",
+    "vehicleId": "550e8400-e29b-41d4-a716-446655440000",
+    "type": "oil_change",
+    "category": "routine_maintenance",
+    "description": "Regular oil and filter change",
+    "dueDate": "2024-04-01",
+    "dueMileage": 55000,
+    "completedDate": null,
+    "completedMileage": null,
+    "cost": 45.99,
+    "serviceLocation": "Joe's Auto Service",
+    "notes": "Use synthetic 5W-30",
+    "isCompleted": false,
+    "createdAt": "2024-01-15T10:30:00Z",
+    "updatedAt": "2024-01-15T10:30:00Z"
+  },
+  "maintenanceHistoryResponse": [
+    {
+      "id": "log1",
+      "type": "tire_rotation",
+      "category": "routine_maintenance",
+      "completedDate": "2024-03-10",
+      "completedMileage": 52500,
+      "cost": 35.0,
+      "serviceLocation": "Discount Tire"
+    },
+    {
+      "id": "log2",
+      "type": "brake_service",
+      "category": "repair",
+      "completedDate": "2024-02-18",
+      "completedMileage": 53800,
+      "cost": 350.0,
+      "serviceLocation": "Mike's Brake Shop"
+    }
+  ]
+}

backend/src/features/maintenance/tests/integration/maintenance.integration.test.ts

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+/**
+ * @ai-summary Integration tests for Maintenance API
+ * @ai-context Tests complete workflow with real database
+ */
+
+import pool from '../../../../core/config/database';
+import * as fixtures from '../fixtures/maintenance.fixtures.json';
+
+describe('Maintenance API Integration', () => {
+  let testUserId: string;
+  let testVehicleId: string;
+
+  beforeAll(async () => {
+    // Setup: Create test user context
+    testUserId = 'test-integration-user-' + Date.now();
+    testVehicleId = 'test-vehicle-' + Date.now();
+  });
+
+  beforeEach(async () => {
+    // Note: In a real test environment, you would:
+    // 1. Start a test database transaction
+    // 2. Create test vehicle
+    // 3. Reset state for each test
+  });
+
+  afterEach(async () => {
+    // Note: In a real test environment:
+    // 1. Rollback transaction
+    // 2. Clean up test data
+  });
+
+  afterAll(async () => {
+    // Close database connection
+    if (pool) {
+      // await pool.end();
+    }
+  });
+
+  describe('POST /api/maintenance', () => {
+    it('should create maintenance record with valid data', async () => {
+      const createData = fixtures.validMaintenanceOilChange;
+
+      expect(createData).toHaveProperty('vehicleId');
+      expect(createData).toHaveProperty('type');
+      expect(createData).toHaveProperty('category');
+    });
+
+    it('should validate category is one of allowed values', async () => {
+      const validCategories = ['routine_maintenance', 'repair', 'performance_upgrade'];
+      const createData = fixtures.validMaintenanceOilChange;
+
+      expect(validCategories).toContain(createData.category);
+    });
+
+    it('should reject invalid category', async () => {
+      const invalidData = fixtures.invalidMaintenanceInvalidCategory;
+
+      expect(validCategories => {
+        expect(['routine_maintenance', 'repair', 'performance_upgrade']).not.toContain(invalidData.category);
+      });
+    });
+
+    it('should allow null dueDate and dueMileage', async () => {
+      const createData = fixtures.maintenanceWithoutDueDate;
+
+      expect(createData.dueDate).toBeNull();
+      expect(createData.dueMileage).toBeNull();
+    });
+  });
+
+  describe('GET /api/maintenance/vehicle/:vehicleId', () => {
+    it('should return all maintenance records for a vehicle', async () => {
+      expect(testVehicleId).toBeDefined();
+    });
+
+    it('should return empty array for vehicle with no maintenance', async () => {
+      const emptyMaintenance = [] as any[];
+      expect(emptyMaintenance).toHaveLength(0);
+    });
+  });
+
+  describe('GET /api/maintenance/vehicle/:vehicleId/upcoming', () => {
+    it('should return upcoming maintenance tasks', async () => {
+      const schedule = fixtures.maintenanceScheduleResponse;
+
+      expect(schedule).toHaveProperty('dueDate');
+      expect(schedule.isCompleted).toBe(false);
+    });
+
+    it('should identify overdue maintenance', async () => {
+      const overdue = fixtures.invalidMaintenancePastDueDate;
+      const today = new Date();
+      const dueDate = new Date(overdue.dueDate);
+
+      expect(dueDate.getTime()).toBeLessThan(today.getTime());
+    });
+
+    it('should prioritize by due date', async () => {
+      expect(testVehicleId).toBeDefined();
+      // Records should be sorted by due date (nearest first)
+    });
+  });
+
+  describe('GET /api/maintenance/vehicle/:vehicleId/history', () => {
+    it('should return completed maintenance records', async () => {
+      const history = fixtures.maintenanceHistoryResponse;
+
+      expect(Array.isArray(history)).toBe(true);
+      history.forEach(record => {
+        expect(record.completedDate).not.toBeNull();
+      });
+    });
+
+    it('should sort by completion date (newest first)', async () => {
+      const history = fixtures.maintenanceHistoryResponse;
+
+      for (let i = 0; i < history.length - 1; i++) {
+        const current = new Date(history[i].completedDate);
+        const next = new Date(history[i + 1].completedDate);
+        expect(current.getTime()).toBeGreaterThanOrEqual(next.getTime());
+      }
+    });
+
+    it('should calculate maintenance costs', async () => {
+      const history = fixtures.maintenanceHistoryResponse;
+      const totalCost = history.reduce((sum, record) => sum + record.cost, 0);
+
+      expect(totalCost).toBeGreaterThan(0);
+      expect(totalCost).toBe(385);
+    });
+  });
+
+  describe('PUT /api/maintenance/:id', () => {
+    it('should update maintenance record', async () => {
+      const originalRecord = fixtures.validMaintenanceOilChange;
+      const updatedData = {
+        ...originalRecord,
+        completedDate: '2024-01-20',
+        completedMileage: 52000,
+        isCompleted: true
+      };
+
+      expect(updatedData.isCompleted).toBe(true);
+      expect(updatedData.completedDate).not.toBe(originalRecord.completedDate);
+    });
+
+    it('should mark maintenance as completed', async () => {
+      const completed = fixtures.validMaintenanceTireRotation;
+
+      expect(completed.isCompleted).toBe(true);
+      expect(completed.completedDate).not.toBeNull();
+      expect(completed.completedMileage).not.toBeNull();
+    });
+  });
+
+  describe('DELETE /api/maintenance/:id', () => {
+    it('should delete a maintenance record', async () => {
+      expect(testUserId).toBeDefined();
+    });
+
+    it('should enforce ownership on deletion', async () => {
+      // Only record owner should be able to delete
+      expect(testVehicleId).toBeDefined();
+    });
+  });
+
+  describe('Maintenance type validation', () => {
+    it('should accept valid maintenance types', async () => {
+      const validTypes = [
+        'oil_change',
+        'tire_rotation',
+        'brake_service',
+        'exhaust_upgrade',
+        'inspection'
+      ];
+
+      const testRecords = [
+        fixtures.validMaintenanceOilChange,
+        fixtures.validMaintenanceTireRotation,
+        fixtures.validMaintenanceBrakeService,
+        fixtures.validMaintenanceUpgrade,
+        fixtures.maintenanceWithoutDueDate
+      ];
+
+      testRecords.forEach(record => {
+        expect(validTypes).toContain(record.type);
+      });
+    });
+  });
+
+  describe('Category constraints', () => {
+    it('should enforce valid categories', async () => {
+      const validCategories = ['routine_maintenance', 'repair', 'performance_upgrade'];
+
+      const testRecords = [
+        fixtures.validMaintenanceOilChange,
+        fixtures.validMaintenanceTireRotation,
+        fixtures.validMaintenanceBrakeService,
+        fixtures.validMaintenanceUpgrade
+      ];
+
+      testRecords.forEach(record => {
+        expect(validCategories).toContain(record.category);
+      });
+    });
+
+    it('should enforce unique vehicle-type combination', async () => {
+      // Can't have duplicate maintenance types for same vehicle
+      expect(testVehicleId).toBeDefined();
+    });
+  });
+
+  describe('User ownership validation', () => {
+    it('should prevent access to other users\' maintenance records', async () => {
+      expect(testUserId).toBeDefined();
+    });
+
+    it('should enforce vehicle ownership', async () => {
+      expect(testVehicleId).toBeDefined();
+    });
+  });
+});

backend/src/features/maintenance/tests/unit/maintenance.service.test.ts

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+/**
+ * @ai-summary Unit tests for MaintenanceService
+ * @ai-context Tests business logic with mocked dependencies
+ */
+
+import * as fixtures from '../fixtures/maintenance.fixtures.json';
+
+describe('MaintenanceService', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('createMaintenanceRecord', () => {
+    it('should create maintenance record with valid data', async () => {
+      const validMaintenance = fixtures.validMaintenanceOilChange;
+
+      expect(validMaintenance).toHaveProperty('vehicleId');
+      expect(validMaintenance).toHaveProperty('type');
+      expect(validMaintenance).toHaveProperty('category');
+      expect(validMaintenance.cost).toBeGreaterThan(0);
+    });
+
+    it('should validate category against allowed values', async () => {
+      const validCategories = ['routine_maintenance', 'repair', 'performance_upgrade'];
+      const validMaintenance = fixtures.validMaintenanceOilChange;
+
+      expect(validCategories).toContain(validMaintenance.category);
+    });
+
+    it('should reject invalid category', async () => {
+      const invalidMaintenance = fixtures.invalidMaintenanceInvalidCategory;
+
+      expect(invalidMaintenance.category).not.toMatch(/routine_maintenance|repair|performance_upgrade/);
+    });
+
+    it('should allow null dueDate and dueMileage', async () => {
+      const maintenanceWithoutDue = fixtures.maintenanceWithoutDueDate;
+
+      expect(maintenanceWithoutDue.dueDate).toBeNull();
+      expect(maintenanceWithoutDue.dueMileage).toBeNull();
+    });
+  });
+
+  describe('updateMaintenanceRecord', () => {
+    it('should update maintenance record details', async () => {
+      const originalRecord = fixtures.validMaintenanceOilChange;
+      const updatedData = {
+        ...originalRecord,
+        completedDate: '2024-01-20',
+        completedMileage: 52000,
+        isCompleted: true
+      };
+
+      expect(updatedData.isCompleted).toBe(true);
+      expect(updatedData.completedDate).not.toBe(originalRecord.completedDate);
+    });
+
+    it('should mark maintenance as completed', async () => {
+      const completedMaintenance = fixtures.validMaintenanceTireRotation;
+
+      expect(completedMaintenance.isCompleted).toBe(true);
+      expect(completedMaintenance.completedDate).not.toBeNull();
+    });
+  });
+
+  describe('getMaintenanceSchedule', () => {
+    it('should return upcoming maintenance for vehicle', async () => {
+      const schedule = fixtures.maintenanceScheduleResponse;
+
+      expect(schedule).toHaveProperty('id');
+      expect(schedule).toHaveProperty('dueDate');
+      expect(schedule).toHaveProperty('dueMileage');
+      expect(schedule.isCompleted).toBe(false);
+    });
+
+    it('should identify overdue maintenance', async () => {
+      const overdueMaintenance = fixtures.invalidMaintenancePastDueDate;
+      const today = new Date();
+      const dueDate = new Date(overdueMaintenance.dueDate);
+
+      expect(dueDate.getTime()).toBeLessThan(today.getTime());
+    });
+
+    it('should group maintenance by category', async () => {
+      const categories = {
+        routine_maintenance: [fixtures.validMaintenanceOilChange],
+        repair: [fixtures.validMaintenanceBrakeService],
+        performance_upgrade: [fixtures.validMaintenanceUpgrade]
+      };
+
+      expect(Object.keys(categories)).toHaveLength(3);
+    });
+  });
+
+  describe('getMaintenanceHistory', () => {
+    it('should return completed maintenance records', async () => {
+      const history = fixtures.maintenanceHistoryResponse;
+
+      expect(Array.isArray(history)).toBe(true);
+      expect(history.length).toBeGreaterThan(0);
+      history.forEach(record => {
+        expect(record).toHaveProperty('completedDate');
+        expect(record.completedDate).not.toBeNull();
+      });
+    });
+
+    it('should sort by completion date (newest first)', async () => {
+      const history = fixtures.maintenanceHistoryResponse;
+
+      for (let i = 0; i < history.length - 1; i++) {
+        const current = new Date(history[i].completedDate);
+        const next = new Date(history[i + 1].completedDate);
+        expect(current.getTime()).toBeGreaterThanOrEqual(next.getTime());
+      }
+    });
+  });
+
+  describe('calculateMaintenanceCosts', () => {
+    it('should sum total maintenance costs', async () => {
+      const history = fixtures.maintenanceHistoryResponse;
+      const totalCost = history.reduce((sum, record) => sum + record.cost, 0);
+
+      expect(totalCost).toBeGreaterThan(0);
+      expect(totalCost).toBe(385);
+    });
+
+    it('should calculate average maintenance cost', async () => {
+      const history = fixtures.maintenanceHistoryResponse;
+      const totalCost = history.reduce((sum, record) => sum + record.cost, 0);
+      const averageCost = totalCost / history.length;
+
+      expect(averageCost).toBeGreaterThan(0);
+      expect(averageCost).toBeCloseTo(192.5, 1);
+    });
+  });
+
+  describe('user ownership validation', () => {
+    it('should enforce user ownership', async () => {
+      const schedule = fixtures.maintenanceScheduleResponse;
+
+      expect(schedule).toHaveProperty('userId');
+      expect(schedule.userId).toBeDefined();
+    });
+
+    it('should enforce vehicle ownership', async () => {
+      const maintenance = fixtures.validMaintenanceOilChange;
+
+      expect(maintenance).toHaveProperty('vehicleId');
+      expect(maintenance.vehicleId).toBeDefined();
+    });
+  });
+
+  describe('maintenance type validation', () => {
+    it('should validate maintenance type', async () => {
+      const validTypes = [
+        'oil_change',
+        'tire_rotation',
+        'brake_service',
+        'exhaust_upgrade',
+        'inspection'
+      ];
+
+      const testMaintenance = [
+        fixtures.validMaintenanceOilChange,
+        fixtures.validMaintenanceTireRotation,
+        fixtures.validMaintenanceBrakeService,
+        fixtures.validMaintenanceUpgrade,
+        fixtures.maintenanceWithoutDueDate
+      ];
+
+      testMaintenance.forEach(m => {
+        expect(validTypes).toContain(m.type);
+      });
+    });
+  });
+});