services/training/tests/
├── conftest.py                 # Test configuration and fixtures
├── test_api.py                 # API endpoint tests
├── test_ml.py                  # ML component tests
├── test_service.py             # Service layer tests
├── test_messaging.py           # Messaging tests
└── test_integration.py         # Integration tests

🧪 Test Coverage

1. API Tests (`test_api.py`)

✅ Health check endpoints (/health, /health/ready, /health/live)
✅ Metrics endpoint (/metrics)
✅ Training job creation and management
✅ Single product training
✅ Job status tracking and cancellation
✅ Data validation endpoints
✅ Error handling and edge cases
✅ Authentication integration

Key Test Classes:

TestTrainingAPI - Basic API functionality
TestTrainingJobsAPI - Training job management
TestSingleProductTrainingAPI - Single product workflows
TestErrorHandling - Error scenarios
TestAuthenticationIntegration - Security tests

2. ML Component Tests (`test_ml.py`)

✅ Data processor functionality
✅ Prophet manager operations
✅ ML trainer orchestration
✅ Feature engineering validation
✅ Model training and validation

Key Test Classes:

TestBakeryDataProcessor - Data preparation and feature engineering
TestBakeryProphetManager - Prophet model management
TestBakeryMLTrainer - ML training orchestration
TestIntegrationML - ML component integration

Key Features Tested:

Spanish holiday detection
Temporal feature engineering
Weather and traffic data integration
Model validation and metrics
Data quality checks

3. Service Layer Tests (`test_service.py`)

✅ Training service business logic
✅ Database operations
✅ External service integration
✅ Job lifecycle management
✅ Error recovery and resilience

Key Test Classes:

TestTrainingService - Core business logic
TestTrainingServiceDataFetching - External API integration
TestTrainingServiceExecution - Training workflow execution
TestTrainingServiceEdgeCases - Edge cases and error conditions

4. Messaging Tests (`test_messaging.py`)

✅ Event publishing functionality
✅ Message structure validation
✅ Error handling in messaging
✅ Integration with shared components

Key Test Classes:

TestTrainingMessaging - Basic messaging operations
TestMessagingErrorHandling - Error scenarios
TestMessagingIntegration - Shared component integration
TestMessagingPerformance - Performance and reliability

5. Integration Tests (`test_integration.py`)

✅ End-to-end workflow testing
✅ Service interaction validation
✅ Error handling across boundaries
✅ Performance and scalability
✅ Security and compliance

Key Test Classes:

TestTrainingWorkflowIntegration - Complete workflows
TestServiceInteractionIntegration - Cross-service communication
TestErrorHandlingIntegration - Error propagation
TestPerformanceIntegration - Performance characteristics
TestSecurityIntegration - Security validation
TestRecoveryIntegration - Recovery scenarios
TestComplianceIntegration - GDPR and audit compliance

🔧 Test Configuration (`conftest.py`)

Fixtures Provided:

test_engine - Test database engine
test_db_session - Database session for tests
test_client - HTTP test client
mock_messaging - Mocked messaging system
mock_data_service - Mocked external data services
mock_ml_trainer - Mocked ML trainer
mock_prophet_manager - Mocked Prophet manager
mock_data_processor - Mocked data processor
training_job_in_db - Sample training job in database
trained_model_in_db - Sample trained model in database

Helper Functions:

assert_training_job_structure() - Validate job data structure
assert_model_structure() - Validate model data structure

🚀 Running Tests

Run All Tests:

cd services/training
pytest tests/ -v

Run Specific Test Categories:

# API tests only
pytest tests/test_api.py -v

# ML component tests
pytest tests/test_ml.py -v

# Service layer tests
pytest tests/test_service.py -v

# Messaging tests
pytest tests/test_messaging.py -v

# Integration tests
pytest tests/test_integration.py -v

Run with Coverage:

pytest tests/ --cov=app --cov-report=html --cov-report=term

Run Performance Tests:

pytest tests/test_integration.py::TestPerformanceIntegration -v

Skip Slow Tests:

pytest tests/ -v -m "not slow"

📊 Test Scenarios Covered

Happy Path Scenarios:

✅ Complete training workflow (start → progress → completion)
✅ Single product training
✅ Data validation and preprocessing
✅ Model training and storage
✅ Event publishing and messaging
✅ Job status tracking and cancellation

Error Scenarios:

✅ Database connection failures
✅ External service unavailability
✅ Invalid input data
✅ ML training failures
✅ Messaging system failures
✅ Authentication and authorization errors

Edge Cases:

✅ Concurrent job execution
✅ Large datasets
✅ Malformed configurations
✅ Network timeouts
✅ Memory pressure scenarios
✅ Rapid successive requests

Security Tests:

✅ Tenant isolation
✅ Input validation
✅ SQL injection protection
✅ Authentication enforcement
✅ Data access controls

Compliance Tests:

✅ Audit trail creation
✅ Data retention policies
✅ GDPR compliance features
✅ Backward compatibility

🎯 Test Quality Metrics

Coverage Goals:

API Layer: 95%+ coverage
Service Layer: 90%+ coverage
ML Components: 85%+ coverage
Integration: 80%+ coverage

Test Types Distribution:

Unit Tests: ~60% (isolated component testing)
Integration Tests: ~30% (service interaction testing)
End-to-End Tests: ~10% (complete workflow testing)

Performance Benchmarks:

All unit tests complete in <5 seconds
Integration tests complete in <30 seconds
End-to-end tests complete in <60 seconds

🔧 Mocking Strategy

External Dependencies Mocked:

✅ Data Service: HTTP calls mocked with realistic responses
✅ RabbitMQ: Message publishing mocked for isolation
✅ Database: SQLite in-memory for fast testing
✅ Prophet Models: Training mocked for speed
✅ File System: Model storage mocked

Real Components Tested:

✅ FastAPI Application: Real app instance
✅ Pydantic Validation: Real validation logic
✅ SQLAlchemy ORM: Real database operations
✅ Business Logic: Real service layer code

🛡️ Continuous Integration

CI Pipeline Tests:

# Example CI configuration
test_matrix:
  - python: "3.11"
    database: "postgresql"
  - python: "3.11" 
    database: "sqlite"

test_commands:
  - pytest tests/ --cov=app --cov-fail-under=85
  - pytest tests/test_integration.py -m "not slow"
  - pytest tests/ --maxfail=1 --tb=short

Quality Gates:

✅ All tests must pass
✅ Coverage must be >85%
✅ No critical security issues
✅ Performance benchmarks met

📈 Test Maintenance

Regular Updates:

✅ Add tests for new features
✅ Update mocks when APIs change
✅ Review and update test data
✅ Maintain realistic test scenarios

Monitoring:

✅ Test execution time tracking
✅ Flaky test identification
✅ Coverage trend monitoring
✅ Test failure analysis

This comprehensive test suite ensures the training service is robust, reliable, and ready for production deployment! 🎉

README.md

Training Service - Complete Testing Suite

📁 Test Structure

🧪 Test Coverage

1. API Tests (test_api.py)

2. ML Component Tests (test_ml.py)

3. Service Layer Tests (test_service.py)

4. Messaging Tests (test_messaging.py)

5. Integration Tests (test_integration.py)

🔧 Test Configuration (conftest.py)

Fixtures Provided:

Helper Functions:

🚀 Running Tests

Run All Tests:

Run Specific Test Categories:

Run with Coverage:

Run Performance Tests:

Skip Slow Tests:

📊 Test Scenarios Covered

Happy Path Scenarios:

Error Scenarios:

Edge Cases:

Security Tests:

Compliance Tests:

🎯 Test Quality Metrics

Coverage Goals:

Test Types Distribution:

Performance Benchmarks:

🔧 Mocking Strategy

External Dependencies Mocked:

Real Components Tested:

🛡️ Continuous Integration

CI Pipeline Tests:

Quality Gates:

📈 Test Maintenance

Regular Updates:

Monitoring:

1. API Tests (`test_api.py`)

2. ML Component Tests (`test_ml.py`)

3. Service Layer Tests (`test_service.py`)

4. Messaging Tests (`test_messaging.py`)

5. Integration Tests (`test_integration.py`)

🔧 Test Configuration (`conftest.py`)