Add unit tests for core wipe algorithms

[BhoomiAgrawal12]

Description

The project currently lacks comprehensive unit tests for the core wiping algorithms (ATA Secure Erase, NVMe Secure Erase, Overwrite, Guttmann, etc.). We need to implement a testing framework to ensure reliability and catch regressions.

Proposed Solution

• Set up a C++ testing framework (e.g., Google Test or Catch2)
• Create mock disk interfaces for testing without real hardware
• Write unit tests for each algorithm in src/algorithms/
• Add tests for edge cases and error handling
• Integrate tests into the build system

Affected Components

• src/algorithms/ata_erase.cpp
• src/algorithms/crypto_erase.cpp
• src/algorithms/overwrite.cpp
• src/algorithms/guttmann.cpp

Acceptance Criteria

• Testing framework integrated with Makefile
• Unit tests for all wipe algorithms
• Test coverage > 70% for algorithm code
• CI/CD pipeline runs tests automatically
• Documentation on running tests

Additional Context

This is crucial for ensuring data is actually being wiped correctly and meeting NIST SP 800-88 compliance standards.