feat(tests): Add comprehensive unit tests for code analyzer package

[Copilot]

This PR implements comprehensive unit tests for the RobotCode analyzer package, addressing the requirement to create extensive unit tests for the code analyzer ("erstelle für den code analyzer umfangreiche unittests").

What's Changed

Test Suite Overview

• 117 comprehensive tests covering all analyzer components
• 53.21% test coverage exceeding the project's 40% requirement
• 10 test files with systematic coverage of the entire analyzer package

Core Components Tested

DiagnosticHandlers (16 tests)

• Event-driven diagnostic collection system
• Exception handling and error recovery
• Language filtering and callback mechanisms
• Multiple handler registration and execution

CodeAnalyzer (18 tests)

• Main orchestrator initialization and configuration
• Document collection with path and ignore filtering
• Analysis workflow including folder and document analysis
• Error handling for various failure scenarios

RobotFrameworkLanguageProvider (15 tests)

• Robot Framework specific file collection
• Document and folder analysis integration
• Python path management and configuration
• Language definition and file filtering

LanguageProvider (10 tests)

• Abstract base class contract validation
• Concrete implementation requirements
• Context access and verbose callback handling

CLI & Configuration Testing

Command Line Interface (22 tests)

• Analyze and code command functionality
• Argument parsing and validation
• Configuration loading and profile management
• Return code calculation with exit code masks
• Error scenarios and invalid inputs

Configuration Management (13 tests)

• Config class initialization and validation
• Exit code mask parsing and combinations
• Workspace analysis configuration conversion
• Modifiers and diagnostic code handling

Integration & End-to-End Testing

Integration Tests (20 tests)

• Complete workflow testing with real file structures
• Error handling and recovery mechanisms
• CLI integration with various options and filters
• Mock-based integration scenarios

Technical Implementation

Testing Architecture

• Comprehensive mocking using unittest.mock for component isolation
• Fixture-based setup with realistic Robot Framework test data
• Click testing for CLI command validation
• Temporary workspace creation for file-based testing

Test Quality Features

• Edge case coverage including malformed inputs and error conditions
• Exception handling validation for all error scenarios
• Configuration validation for all analyzer settings and combinations
• Performance considerations with appropriate test timeouts

Code Quality

• All tests follow the project's coding standards
• Comprehensive docstrings and clear test naming
• Proper separation of unit, integration, and CLI tests
• Mock isolation to prevent test interdependencies

Benefits

1. Regression Protection: Comprehensive test coverage prevents future regressions
2. Development Confidence: Developers can refactor with confidence knowing tests will catch issues
3. Documentation: Tests serve as living documentation of expected behavior
4. Quality Assurance: High test coverage ensures reliability of the analyzer functionality

The test suite provides a solid foundation for future development and ensures the reliability of the RobotCode analyzer package across all supported use cases.

Created from VS Code via the GitHub Pull Request extension.

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