🧪 [Feature Request]: Add Comprehensive Unit Tests for `ValkyrieScanner` Core Class

[Einswilli]

The ValkyrieScanner class in valkyrie.core.scanner.py is the heart of our scanning engine. To ensure its reliability, stability, and maintainability, we need to implement comprehensive unit tests that cover all its functionalities and configuration options.

🎯 Goals

• Ensure reliability of the core scanning functionality
• Prevent regressions during future development
• Validate configuration handling and error cases
• Facilitate refactoring with confidence
• Achieve 90%+ test coverage for the scanner module

📋 Test Scope

• Scanner Initialization Tests tests/core/test_scanner_initialization.py
• Configuration Handling Tests tests/core/test_scanner_config.py
• Scanning Functionality Tests tests/core/test_scanner_functionality.py
• Error Handling Tests tests/core/test_scanner_error_handling.py
• Performance Tests tests/core/test_scanner_performance.py

✅ Acceptance Criteria

• Test coverage of 90%+ for valkyrie/core/scanner.py
• All public methods of ValkyrieScanner are tested
• Configuration handling is thoroughly tested
• Error conditions are properly tested
• Mock objects are used for external dependencies
• Test data includes various file types and structures
• Performance benchmarks are established

🛠️ Implementation Notes

1. Use pytest fixtures for common test setup
2. Mock external dependencies (file system, rules, etc.)
3. Use parameterized tests for different configurations
4. Create test utilities for generating test data
5. Ensure tests are isolated and independent

💡 Additional Considerations

• Test parallel scanning if supported
• Test memory usage with large files
• Test encoding handling for different file types
• Test symlink handling if supported