# Integration Test: Configuration Manager

## Summary
Validate the Configuration Manager responsible for loading, validating, and providing system configuration parameters.

## Component Under Test
**Component**: Configuration Manager
**Location**: `gps_denied_16_configuration_manager`
**Dependencies**: File system, Environment variables

## Detailed Description
Tests that Configuration Manager can:
1. Load configuration from files (YAML/JSON)
2. Override with environment variables
3. Validate configuration parameters
4. Provide default values
5. Support configuration hot-reload
6. Handle invalid configurations gracefully
7. Manage sensitive data (API keys)

## Input Data

### Test Case 1: Load Default Configuration
- **File**: config/default.yaml
- **Expected**: All default parameters loaded

### Test Case 2: Environment Variable Override
- **Env**: GOOGLE_MAPS_API_KEY=test_key_123
- **Expected**: Overrides config file value

### Test Case 3: Invalid Configuration
- **File**: Invalid YAML syntax
- **Expected**: Load fails with clear error

### Test Case 4: Missing Required Parameter
- **File**: Missing altitude parameter
- **Expected**: Validation fails, uses default or errors

### Test Case 5: Parameter Validation
- **Config**: altitude_m = -100 (invalid)
- **Expected**: Validation rejects negative altitude

### Test Case 6: Configuration Hot-Reload
- **Scenario**: Modify config file while system running
- **Expected**: Changes detected and applied

### Test Case 7: Sensitive Data Handling
- **Config**: API keys, passwords
- **Expected**: Not logged, encrypted at rest

## Expected Output
```json
{
  "config_loaded": true,
  "config_source": "file|env|default",
  "parameters": {
    "altitude_m": 400,
    "google_maps_zoom": 19,
    "gpu_device_id": 0,
    "processing_timeout_s": 300
  },
  "validation_errors": [],
  "load_time_ms": <float>
}
```

## Success Criteria
- All test cases load or fail appropriately
- Validation catches invalid parameters
- Sensitive data protected
- Load time < 500ms

## Maximum Expected Time
- Load configuration: < 500ms
- Validate: < 100ms
- Hot-reload: < 1 second
- Total test suite: < 30 seconds

## Pass/Fail Criteria
**Passes If**: All configurations load/validate correctly, overrides work, sensitive data protected
**Fails If**: Invalid configs not detected, sensitive data exposed, overrides don't work