feat: add comprehensive Python testing infrastructure with Poetry

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Testing
+.pytest_cache/
+.coverage
+.coverage.*
+htmlcov/
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.tox/
+.nox/
+coverage.json
+coverage.lcov
+
+# Virtual environments
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+.python-version
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.project
+.pydevproject
+.settings/
+.DS_Store
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# Claude
+.claude/*
+
+# Poetry (DO NOT ignore poetry.lock)
+dist/
+
+# UV (DO NOT ignore uv.lock)

pyproject.toml

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+[tool.poetry]
+name = "pysift"
+version = "0.1.0"
+description = "A pure Python implementation of SIFT (Scale-Invariant Feature Transform)"
+authors = ["Your Name <[email protected]>"]
+readme = "README.md"
+license = "MIT"
+homepage = "https://github.com/duerrp/pysift"
+repository = "https://github.com/duerrp/pysift"
+keywords = ["sift", "computer-vision", "feature-detection", "image-processing"]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "Intended Audience :: Education",
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Topic :: Scientific/Engineering :: Image Recognition",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+numpy = "^1.19.4"
+opencv-python-headless = "^4.3.0"
+matplotlib = "^3.0.0"
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^7.4.0"
+pytest-cov = "^4.1.0"
+pytest-mock = "^3.11.1"
+
+[tool.poetry.scripts]
+test = "pytest:main"
+tests = "pytest:main"
+
+[tool.pytest.ini_options]
+minversion = "7.0"
+addopts = [
+    "-ra",
+    "--strict-markers",
+    "--strict-config",
+    "--cov=pysift",
+    "--cov-branch",
+    "--cov-report=term-missing:skip-covered",
+    "--cov-report=html:htmlcov",
+    "--cov-report=xml:coverage.xml",
+    "--cov-fail-under=0",  # Set to 80 when actual tests are added
+    "-vv",
+]
+testpaths = ["tests"]
+python_files = ["test_*.py", "*_test.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+markers = [
+    "unit: marks tests as unit tests (fast, isolated)",
+    "integration: marks tests as integration tests (may involve external dependencies)",
+    "slow: marks tests as slow (deselect with '-m \"not slow\"')",
+]
+filterwarnings = [
+    "error",
+    "ignore::UserWarning",
+    "ignore::DeprecationWarning",
+]
+
+[tool.coverage.run]
+source = ["pysift"]
+branch = true
+parallel = true
+omit = [
+    "*/tests/*",
+    "*/test_*.py",
+    "*/__pycache__/*",
+    "*/site-packages/*",
+]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "def __repr__",
+    "if self.debug:",
+    "if settings.DEBUG",
+    "raise AssertionError",
+    "raise NotImplementedError",
+    "if 0:",
+    "if __name__ == .__main__.:",
+    "if TYPE_CHECKING:",
+    "class .*\\bProtocol\\):",
+    "@(abc\\.)?abstractmethod",
+]
+precision = 2
+show_missing = true
+skip_covered = false
+skip_empty = true
+
+[tool.coverage.html]
+directory = "htmlcov"
+
+[tool.coverage.xml]
+output = "coverage.xml"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"

tests/conftest.py

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+import os
+import tempfile
+from pathlib import Path
+from typing import Generator
+
+import cv2
+import numpy as np
+import pytest
+
+
+@pytest.fixture
+def temp_dir() -> Generator[Path, None, None]:
+    """Create a temporary directory for test files."""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        yield Path(tmpdir)
+
+
+@pytest.fixture
+def sample_image() -> np.ndarray:
+    """Create a simple test image."""
+    image = np.zeros((100, 100, 3), dtype=np.uint8)
+    cv2.rectangle(image, (20, 20), (80, 80), (255, 255, 255), -1)
+    cv2.circle(image, (50, 50), 20, (0, 0, 0), -1)
+    return image
+
+
+@pytest.fixture
+def grayscale_image() -> np.ndarray:
+    """Create a simple grayscale test image."""
+    image = np.zeros((100, 100), dtype=np.uint8)
+    cv2.rectangle(image, (20, 20), (80, 80), 255, -1)
+    cv2.circle(image, (50, 50), 20, 0, -1)
+    return image
+
+
+@pytest.fixture
+def sample_keypoints():
+    """Create sample keypoints for testing."""
+    keypoints = [
+        cv2.KeyPoint(x=10.0, y=10.0, size=5.0, angle=0.0),
+        cv2.KeyPoint(x=50.0, y=50.0, size=10.0, angle=45.0),
+        cv2.KeyPoint(x=90.0, y=90.0, size=15.0, angle=90.0),
+    ]
+    return keypoints
+
+
+@pytest.fixture
+def sample_descriptors():
+    """Create sample descriptors for testing."""
+    np.random.seed(42)
+    descriptors = np.random.randint(0, 256, (3, 128), dtype=np.uint8)
+    return descriptors
+
+
+@pytest.fixture
+def mock_config():
+    """Provide a mock configuration for testing."""
+    return {
+        'sigma': 1.6,
+        'num_intervals': 3,
+        'assumed_blur': 0.5,
+        'image_border_width': 5,
+        'contrast_threshold': 0.04,
+        'edge_threshold': 10,
+        'gaussian_kernel_size': 16,
+    }
+
+
+@pytest.fixture(autouse=True)
+def reset_cv2_modules():
+    """Reset cv2 modules state before each test."""
+    yield
+
+
+@pytest.fixture
+def capture_stdout(monkeypatch):
+    """Capture stdout for testing print statements."""
+    import io
+    import sys
+
+    captured_output = io.StringIO()
+    monkeypatch.setattr(sys, 'stdout', captured_output)
+    return captured_output
+
+
+@pytest.fixture
+def test_image_path(temp_dir: Path, sample_image: np.ndarray) -> Path:
+    """Save a test image to a temporary file and return its path."""
+    image_path = temp_dir / "test_image.png"
+    cv2.imwrite(str(image_path), sample_image)
+    return image_path
+
+
+@pytest.fixture(scope="session")
+def test_data_dir() -> Path:
+    """Return the path to the test data directory."""
+    return Path(__file__).parent / "data"
+
+
+@pytest.fixture
+def mock_sift_detector(mocker):
+    """Mock SIFT detector for testing."""
+    mock_detector = mocker.Mock()
+    mock_detector.detectAndCompute.return_value = ([], None)
+    return mock_detector
+
+
+def pytest_configure(config):
+    """Configure pytest with custom settings."""
+    config.addinivalue_line(
+        "markers", "performance: mark test as a performance test"
+    )
+    config.addinivalue_line(
+        "markers", "requires_display: mark test as requiring a display"
+    )