# Contract Tests

This module contains contract tests for the user gallery fusion component API.

## Test Structure

```
tests/contract/
├── __init__.py              # Module initialization
├── test_user_gallery_api.py # OpenAPI contract validation
├── test_data_models.py      # Data model contract validation
└── test_error_handling.py   # Error response contract validation
```

## Test Coverage

### API Contract Validation
- OpenAPI specification compliance
- Request/response schema validation
- HTTP status code validation
- Error response format validation
- Authentication and authorization contracts

### Data Model Contracts
- Request payload validation
- Response payload structure
- Field type and format validation
- Required field validation
- Enum value validation

### Error Handling Contracts
- Standardized error response format
- Error code validation
- Error message format
- HTTP status code mapping
- Error response schema validation

## Testing Strategy

### Contract Test Principles
1. **Specification Driven**: Tests derived from OpenAPI specifications
2. **Schema Validation**: JSON schema validation for all requests/responses
3. **Backward Compatibility**: Ensure API changes don't break contracts
4. **Documentation Alignment**: API behavior matches documentation

### Test Generation
- Auto-generated tests from OpenAPI specifications
- Manual tests for complex scenarios
- Edge case validation
- Error condition testing

### Validation Strategy
- Request schema validation before execution
- Response schema validation after execution
- HTTP status code validation
- Error response format validation
- Performance contract validation

## Running Tests

```bash
# Run all contract tests
pytest tests/contract/ -v

# Run API contract validation
pytest tests/contract/test_user_gallery_api.py -v

# Run data model contract tests
pytest tests/contract/test_data_models.py -v

# Run with schema validation
pytest tests/contract/ --validate-schema -v
```

## Test Configuration

Contract tests use pytest fixtures for specification management:
- OpenAPI specification loading
- Schema validation setup
- Mock server configuration
- Test data generation

## Continuous Integration

Contract tests are executed in CI/CD pipeline with:
- Contract validation on every commit
- Breaking change detection
- API documentation synchronization
- Backward compatibility validation