feat: Set up 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
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+Pipfile.lock
+
+# poetry
+poetry.lock
+
+# pdm
+.pdm.toml
+.pdm-python
+.pdm-build/
+
+# PEP 582
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# IDE settings
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# Claude settings
+.claude/*
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Project specific
+output/
+checkpoints/
+data/
+wandb/
+runs/

CLAUDE.md

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+# CLAUDE.md - Project Context
+
+This file contains important context and instructions for Claude Code.
+
+## Project Overview
+Python project requiring testing infrastructure setup.
+
+## Commands to Run After Code Changes
+- `poetry run test` - Run all tests
+- `poetry run lint` - Run linting (if configured)
+- `poetry run typecheck` - Run type checking (if configured)
+
+## Testing Infrastructure
+- Package manager: Poetry (or UV if detected)
+- Test framework: pytest
+- Coverage: pytest-cov
+- Test directories: tests/unit/, tests/integration/
+
+## Important Notes
+- Always run tests after making changes
+- Coverage threshold is currently set to 0% for infrastructure setup
+- **TODO**: Change `--cov-fail-under=0` to `--cov-fail-under=80` in pyproject.toml after writing tests
+- Use conventional commit messages

pyproject.toml

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+[tool.poetry]
+name = "gaussian-splatting"
+version = "0.1.0"
+description = "3D Gaussian Splatting for Real-Time Radiance Field Rendering"
+authors = ["Your Name <[email protected]>"]
+readme = "README.md"
+packages = [{include = "scene"}, {include = "utils"}, {include = "arguments"}, {include = "gaussian_renderer"}, {include = "lpipsPyTorch"}, {include = "scripts"}]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+plyfile = "*"
+opencv-python = "*"
+lpips = "*"
+trimesh = "*"
+numpy = "*"
+torch = "*"
+
+[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]
+testpaths = ["tests"]
+python_files = ["test_*.py", "*_test.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = [
+    "-v",
+    "--strict-markers",
+    "--tb=short",
+    "--cov=scene",
+    "--cov=utils",
+    "--cov=arguments", 
+    "--cov=gaussian_renderer",
+    "--cov=lpipsPyTorch",
+    "--cov-report=html",
+    "--cov-report=xml",
+    "--cov-report=term-missing",
+    "--cov-fail-under=0"
+]
+markers = [
+    "unit: Unit tests",
+    "integration: Integration tests",
+    "slow: Slow running tests"
+]
+
+[tool.coverage.run]
+source = ["scene", "utils", "arguments", "gaussian_renderer", "lpipsPyTorch"]
+omit = [
+    "*/tests/*",
+    "*/test_*.py",
+    "*/__pycache__/*",
+    "*/site-packages/*",
+    "setup.py",
+    "*/migrations/*"
+]
+
+[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__.:"
+]
+show_missing = true
+precision = 2
+
+[tool.coverage.html]
+directory = "htmlcov"
+
+[tool.coverage.xml]
+output = "coverage.xml"
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"