Add comprehensive unit tests for argparse library

[Copilot]

This PR adds a complete unit test suite for the argparse library, providing comprehensive coverage of all functionality and use conditions as requested in the issue.

Test Coverage Added

Test Framework

• Created a lightweight test framework with assertion macros (ASSERT_TRUE, ASSERT_FALSE, ASSERT_EQ, ASSERT_STREQ)
• Integrated with CMake's CTest for automated testing
• Added custom run_tests target for easy test execution

Test Suites (44 total test cases)

Parser Tests (17 tests)

• Constructor/destructor functionality
• Parameter addition for all types (NONE, INTEGER, STRING, FLOAT)
• Short flag parsing (-h)
• Long flag parsing (--help)
• Parameter value parsing and retrieval
• Multiple parameter combinations
• argc/argv interface compatibility
• Error handling (unknown parameters, missing values)
• Help message generation
• Program name extraction from paths

Parameter Tests (12 tests)

• parameter_none: Boolean flag behavior
• parameter_integer: Integer parsing with different bases (decimal, hex, octal)
• parameter_string: String parameter handling
• parameter_float: Floating-point value parsing
• Required parameter functionality
• Parameter construction with empty names

Utility Tests (8 tests)

• Parameter factory creation for all types
• Default parameter type handling
• Memory management verification
• Parameter functionality after creation

Integration Tests (7 tests)

• Complex real-world parsing scenarios
• Mixed short/long parameter usage
• Default value handling
• Help message formatting
• Comprehensive error scenarios
• Edge cases and boundary conditions

Bug Fixes

During test development, discovered and fixed two minor issues:

1. Uninitialized required field: Added proper initialization in parameter constructor
2. Parameter lookup improvement: Enhanced get_parameter_value_to() to handle both short and long names when passed without dashes

Usage

# Build with tests
mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=Debug
make

# Run all tests
ctest --verbose
# or
make run_tests

# Run individual test suites
./test_parser
./test_parameters  
./test_util
./test_integration

Test Results

✅ All 44 test cases pass (100% success rate)
✅ Original functionality verified with example program
✅ Memory management tested (no leaks)
✅ Error conditions properly handled

The test suite ensures the argparse library works correctly across all supported use cases and provides a solid foundation for future development.

Fixes #2.

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[helium729]

Please update Readme and workflow corresponding @copilot

[Copilot]

Please update Readme and workflow corresponding @copilot

Updated README.md and GitHub workflow (.github/workflows/cmake.yml) to include comprehensive test suite information. The README now includes detailed testing instructions, compilation notes for building with tests, test coverage overview, and better usage examples. The workflow now runs tests in both Release and Debug modes with proper error reporting. Commit: 154bc0e