Add unit tests for core modules

[hbisneto]

Create Comprehensive Unit Tests for FileSystemPro Core Modules

FileSystemPro is a cross-platform file management library that currently lacks comprehensive unit test coverage for its core functionality. The project needs unit tests for the following modules:

Modules Requiring Unit Tests:

1. FileSystem Module

• Cross-platform path detection and resolution
• OS-specific directory path variables (desktop, documents, downloads, etc.)
• Platform identification logic for Linux, macOS, and Windows

2. File Module

• File creation, deletion, and manipulation operations
• Checksum calculation and integrity verification
• File splitting and reassembly functionality
• File enumeration and metadata retrieval

3. Directory Module

• Directory creation, deletion, and manipulation
• Path combination and joining operations
• Directory listing and information retrieval

4. Wrapper Module

• Metadata retrieval for files and directories
• File extension checking functionality
• Object information gathering

5. Watcher Module

• File system monitoring and change detection
• State comparison and difference tracking
• Real-time file system event handling

6. Compression Module

• TAR and ZIP archive creation and extraction
• Archive reading and content listing
• Compression format handling

7. Device Module

• System disk information retrieval
• CPU usage and performance metrics
• Storage metrics and partition information

Testing Requirements:

Framework: Use Python's built-in unittest framework (consistent with existing console tests)

Cross-Platform Testing: Ensure tests work across all supported platforms (Linux, macOS, Windows) and Python versions 3.8+

Test Coverage Areas:

• Unit tests for individual functions and methods
• Integration tests for module interactions
• Mock testing for system-dependent operations
• Error handling and edge case validation
• Cross-platform compatibility verification

Benefits:

• Ensure reliability across supported platforms
• Prevent regressions during development
• Improve code quality and maintainability
• Validate cross-platform functionality
• Enable confident refactoring and feature additions

Implementation Notes:

• Use appropriate mocking for file system operations to avoid side effects
• Include tests for error conditions and edge cases
• Ensure tests are isolated and can run independently
• Follow existing test patterns from the console module

This comprehensive test suite will significantly improve the project's reliability and maintainability while ensuring consistent behavior across all supported platforms.