Enhancement: Add unit test infrastructure

[arunsanna]

Description

The repository currently has no unit tests. Adding a test infrastructure would improve code quality, enable safe refactoring, and support CI/CD workflows.

Current State

• No tests/ directory
• No test fixtures or mocking infrastructure
• Classes are tightly coupled to HuggingFace API (hard to test offline)

Proposed Solution

1. Add pytest infrastructure

tests/
├── __init__.py
├── conftest.py          # Shared fixtures
├── test_generator.py    # Generator unit tests
├── test_extractor.py    # Enhanced extractor tests
├── test_scoring.py      # Completeness scoring tests
├── test_api.py          # API endpoint tests
└── fixtures/
    ├── sample_model_card.json
    └── expected_aibom.json

2. Create mock HuggingFace API responses

# conftest.py
@pytest.fixture
def mock_hf_api(mocker):
    mock = mocker.patch('huggingface_hub.HfApi')
    mock.return_value.model_info.return_value = MockModelInfo(...)
    return mock

3. Add CycloneDX schema validation

def test_aibom_schema_compliance():
    aibom = generator.generate_aibom("test/model")
    validate(aibom, cyclonedx_1_6_schema)  # JSON Schema validation

Benefits

• Catch regressions before deployment
• Enable offline development/testing
• Support for CI/CD integration
• Easier onboarding for new contributors
• Validate CycloneDX 1.6 compliance automatically

Dependencies to Add

pytest>=7.0.0
pytest-mock>=3.10.0
pytest-cov>=4.0.0
jsonschema>=4.17.0

Volunteer

Happy to help set up the initial test infrastructure and create example tests for core functionality.