diff --git a/.gitignore b/.gitignore
index 72c0cf4..fe826c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,58 @@
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 build/
 dist/
-venv-*/
 *.egg-info/
+*.eggs/
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+
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+venv/
+env/
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+
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+.coverage
+htmlcov/
+coverage.xml
+*.cover
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+
+# Claude
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+
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 .*.swp
+.vscode/
+.idea/
+*.sublime-*
+
+# Python
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+*.py[cod]
+*$py.class
+*.so
+.Python
+
+# OS
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+Thumbs.db
+*~
+
+# Package managers
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+pip-delete-this-directory.txt
+
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+
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+
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diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..979dfbc
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,283 @@
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+pluggy = ">=0.12,<2.0"
+tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
+
+[package.extras]
+testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
+
+[[package]]
+name = "pytest-cov"
+version = "4.1.0"
+description = "Pytest plugin for measuring coverage."
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+files = [
+    {file = "pytest-cov-4.1.0.tar.gz", hash = "sha256:3904b13dfbfec47f003b8e77fd5b589cd11904a21ddf1ab38a64f204d6a10ef6"},
+    {file = "pytest_cov-4.1.0-py3-none-any.whl", hash = "sha256:6ba70b9e97e69fcc3fb45bfeab2d0a138fb65c4d0d6a41ef33983ad114be8c3a"},
+]
+
+[package.dependencies]
+coverage = {version = ">=5.2.1", extras = ["toml"]}
+pytest = ">=4.6"
+
+[package.extras]
+testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
+
+[[package]]
+name = "pytest-mock"
+version = "3.11.1"
+description = "Thin-wrapper around the mock package for easier use with pytest"
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+files = [
+    {file = "pytest-mock-3.11.1.tar.gz", hash = "sha256:7f6b125602ac6d743e523ae0bfa71e1a697a2f5534064528c6ff84c2f7c2fc7f"},
+    {file = "pytest_mock-3.11.1-py3-none-any.whl", hash = "sha256:21c279fff83d70763b05f8874cc9cfb3fcacd6d354247a976f9529d19f9acf39"},
+]
+
+[package.dependencies]
+pytest = ">=5.0"
+
+[package.extras]
+dev = ["pre-commit", "pytest-asyncio", "tox"]
+
+[[package]]
+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+markers = "python_full_version <= \"3.11.0a6\""
+files = [
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
+    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
+]
+
+[[package]]
+name = "typing-extensions"
+version = "4.7.1"
+description = "Backported and Experimental Type Hints for Python 3.7+"
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+markers = "python_version < \"3.11\""
+files = [
+    {file = "typing_extensions-4.7.1-py3-none-any.whl", hash = "sha256:440d5dd3af93b060174bf433bccd69b0babc3b15b1a8dca43789fd7f61514b36"},
+    {file = "typing_extensions-4.7.1.tar.gz", hash = "sha256:b75ddc264f0ba5615db7ba217daeb99701ad295353c45f9e95963337ceeeffb2"},
+]
+
+[[package]]
+name = "zipp"
+version = "3.15.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+markers = "python_version == \"3.7\""
+files = [
+    {file = "zipp-3.15.0-py3-none-any.whl", hash = "sha256:48904fc76a60e542af151aded95726c1a5c34ed43ab4134b597665c86d7ad556"},
+    {file = "zipp-3.15.0.tar.gz", hash = "sha256:112929ad649da941c23de50f356a2b5570c954b65150642bccdd66bf194d224b"},
+]
+
+[package.extras]
+docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-lint"]
+testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more-itertools", "pytest (>=6)", "pytest-black (>=0.3.7) ; platform_python_implementation != \"PyPy\"", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8 ; python_version < \"3.12\"", "pytest-mypy (>=0.9.1) ; platform_python_implementation != \"PyPy\""]
+
+[metadata]
+lock-version = "2.1"
+python-versions = ">=3.7"
+content-hash = "9fbf1ad8e3706a4bf245fd662fd630795b801650e715f3bba4d1bbfcef093023"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..3451737
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,98 @@
+[tool.poetry]
+name = "Jetson.GPIO"
+version = "2.1.9"
+description = "A module to control Jetson GPIO channels"
+authors = ["NVIDIA <linux-tegra-bugs@nvidia.com>"]
+license = "MIT"
+readme = "README.md"
+homepage = "https://github.com/NVIDIA/jetson-gpio"
+keywords = ["Jetson", "GPIO"]
+classifiers = [
+    "Operating System :: POSIX :: Linux",
+    "License :: OSI Approved :: MIT License",
+    "Intended Audience :: Developers",
+    "Programming Language :: Python :: 2.7",
+    "Programming Language :: Python :: 3",
+    "Topic :: Software Development",
+    "Topic :: System :: Hardware"
+]
+packages = [
+    { include = "Jetson", from = "lib/python" },
+    { include = "RPi", from = "lib/python" }
+]
+include = ["lib/python/Jetson/GPIO/99-gpio.rules"]
+
+[tool.poetry.dependencies]
+python = ">=3.7"
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^7.4.0"
+pytest-cov = "^4.1.0"
+pytest-mock = "^3.11.0"
+
+[tool.poetry.scripts]
+test = "pytest:main"
+tests = "pytest:main"
+
+[tool.pytest.ini_options]
+minversion = "7.0"
+testpaths = ["tests"]
+python_files = ["test_*.py", "*_test.py"]
+python_classes = ["Test*", "*Tests"]
+python_functions = ["test_*"]
+addopts = [
+    "-ra",
+    "--strict-markers",
+    "--strict-config",
+    "--cov=lib/python/Jetson",
+    "--cov=lib/python/RPi",
+    "--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"
+]
+markers = [
+    "unit: marks tests as unit tests (fast, isolated)",
+    "integration: marks tests as integration tests (slower, may require hardware)",
+    "slow: marks tests as slow running"
+]
+
+[tool.coverage.run]
+source = ["lib/python/Jetson", "lib/python/RPi"]
+branch = true
+omit = [
+    "*/tests/*",
+    "*/test_*.py",
+    "*/__init__.py",
+    "*/samples/*"
+]
+
+[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__.:",
+    "class .*\\bProtocol\\):",
+    "@(abc\\.)?abstractmethod"
+]
+precision = 2
+show_missing = true
+skip_covered = false
+fail_under = 0  # Set to 80 when actual tests are added
+
+[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"
\ No newline at end of file
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..379fec6
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,95 @@
+import os
+import sys
+import tempfile
+import shutil
+from pathlib import Path
+import pytest
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'lib', 'python'))
+
+
+@pytest.fixture
+def temp_dir():
+    """Create a temporary directory for test files."""
+    temp_dir = tempfile.mkdtemp()
+    yield Path(temp_dir)
+    shutil.rmtree(temp_dir)
+
+
+@pytest.fixture
+def mock_gpio_hardware(mocker):
+    """Mock the GPIO hardware interface for testing without actual hardware."""
+    mock_hw = mocker.MagicMock()
+    mock_hw.is_jetson = True
+    mock_hw.get_model = mocker.MagicMock(return_value="JETSON_NANO")
+    mock_hw.get_jetson_board_revision = mocker.MagicMock(return_value="A02")
+    return mock_hw
+
+
+@pytest.fixture
+def mock_gpio_permissions(mocker, temp_dir):
+    """Mock GPIO permissions and sysfs paths."""
+    gpio_path = temp_dir / "sys" / "class" / "gpio"
+    gpio_path.mkdir(parents=True, exist_ok=True)
+    
+    mocker.patch.dict(os.environ, {
+        "JETSON_GPIO_TEST": "1",
+        "JETSON_GPIO_SYSFS": str(gpio_path)
+    })
+    
+    return gpio_path
+
+
+@pytest.fixture
+def gpio_cleanup():
+    """Ensure GPIO cleanup after each test."""
+    yield
+    try:
+        import Jetson.GPIO as GPIO
+        GPIO.cleanup()
+    except Exception:
+        pass
+
+
+@pytest.fixture
+def mock_config():
+    """Provide a mock configuration dictionary."""
+    return {
+        "debug": False,
+        "warnings": True,
+        "mode": "BOARD",
+        "pwm_frequency": 2000,
+        "cleanup_on_exit": True
+    }
+
+
+@pytest.fixture
+def sample_pin_data():
+    """Provide sample GPIO pin data for testing."""
+    return {
+        "board_pins": {
+            7: {"name": "GPIO_PZ0", "gpio": 216, "pwm": None},
+            11: {"name": "GPIO_PQ5", "gpio": 133, "pwm": None},
+            12: {"name": "GPIO_PE6", "gpio": 38, "pwm": 2},
+            13: {"name": "GPIO_PQ6", "gpio": 134, "pwm": None},
+            15: {"name": "GPIO_PH1", "gpio": 57, "pwm": None}
+        },
+        "bcm_pins": {
+            4: {"name": "GPIO_PZ0", "gpio": 216, "pwm": None},
+            17: {"name": "GPIO_PQ5", "gpio": 133, "pwm": None},
+            18: {"name": "GPIO_PE6", "gpio": 38, "pwm": 2},
+            27: {"name": "GPIO_PQ6", "gpio": 134, "pwm": None},
+            22: {"name": "GPIO_PH1", "gpio": 57, "pwm": None}
+        }
+    }
+
+
+@pytest.fixture(autouse=True)
+def reset_modules():
+    """Reset imported modules to ensure clean state between tests."""
+    modules_to_remove = [
+        module for module in sys.modules 
+        if module.startswith(('Jetson', 'RPi'))
+    ]
+    for module in modules_to_remove:
+        del sys.modules[module]
\ No newline at end of file
diff --git a/tests/integration/__init__.py b/tests/integration/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/__init__.py b/tests/unit/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/test_setup_validation.py b/tests/unit/test_setup_validation.py
new file mode 100644
index 0000000..1b207c2
--- /dev/null
+++ b/tests/unit/test_setup_validation.py
@@ -0,0 +1,67 @@
+import pytest
+import sys
+import os
+
+
+class TestSetupValidation:
+    """Validation tests to ensure the testing infrastructure is properly configured."""
+    
+    def test_python_path_configured(self):
+        """Test that the Python path includes the library directory."""
+        lib_path = os.path.join(os.path.dirname(__file__), '..', '..', 'lib', 'python')
+        lib_path = os.path.abspath(lib_path)
+        assert any(os.path.abspath(path) == lib_path for path in sys.path), \
+            "Library path not found in sys.path"
+    
+    def test_fixtures_available(self, temp_dir, mock_config, sample_pin_data):
+        """Test that all required fixtures are available and working."""
+        assert temp_dir.exists()
+        assert temp_dir.is_dir()
+        
+        assert isinstance(mock_config, dict)
+        assert "debug" in mock_config
+        assert "mode" in mock_config
+        
+        assert isinstance(sample_pin_data, dict)
+        assert "board_pins" in sample_pin_data
+        assert "bcm_pins" in sample_pin_data
+    
+    def test_mock_gpio_fixtures(self, mock_gpio_hardware, mock_gpio_permissions):
+        """Test GPIO-specific fixtures."""
+        assert mock_gpio_hardware.is_jetson is True
+        assert mock_gpio_hardware.get_model() == "JETSON_NANO"
+        assert mock_gpio_hardware.get_jetson_board_revision() == "A02"
+        
+        assert mock_gpio_permissions.exists()
+        assert mock_gpio_permissions.is_dir()
+    
+    @pytest.mark.unit
+    def test_unit_marker(self):
+        """Test that the unit marker is properly configured."""
+        assert True
+    
+    @pytest.mark.integration
+    def test_integration_marker(self):
+        """Test that the integration marker is properly configured."""
+        assert True
+    
+    @pytest.mark.slow
+    def test_slow_marker(self):
+        """Test that the slow marker is properly configured."""
+        assert True
+    
+    def test_coverage_configured(self):
+        """Test that coverage is properly configured."""
+        try:
+            import coverage
+            assert True
+        except ImportError:
+            pytest.fail("Coverage module not installed")
+    
+    def test_pytest_mock_available(self):
+        """Test that pytest-mock is available."""
+        try:
+            import pytest_mock
+            assert True
+        except ImportError:
+            pytest.fail("pytest-mock module not installed")
\ No newline at end of file