diff --git a/.gitignore b/.gitignore
index 67f07aaef..cc6250808 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,53 @@
 node_modules
 package-lock.json
 gen
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# Virtual environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+coverage.xml
+*.cover
+.hypothesis/
+.tox/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# Claude settings
+.claude/*
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 000000000..3f3abb433
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,282 @@
+# This file is automatically @generated by Poetry 2.1.4 and should not be changed by hand.
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+optional = false
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+groups = ["test"]
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+]
+
+[[package]]
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+    {file = "pluggy-1.5.0.tar.gz", hash = "sha256:2cffa88e94fdc978c4c574f15f9e59b7f4201d439195c3715ca9e2486f1d0cf1"},
+]
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
+
+[[package]]
+name = "pytest"
+version = "7.4.4"
+description = "pytest: simple powerful testing with Python"
+optional = false
+python-versions = ">=3.7"
+groups = ["test"]
+files = [
+    {file = "pytest-7.4.4-py3-none-any.whl", hash = "sha256:b090cdf5ed60bf4c45261be03239c2c1c22df034fbffe691abe93cd80cea01d8"},
+    {file = "pytest-7.4.4.tar.gz", hash = "sha256:2cf0005922c6ace4a3e2ec8b4080eb0d9753fdc93107415332f50ce9e7994280"},
+]
+
+[package.dependencies]
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
+iniconfig = "*"
+packaging = "*"
+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 = ["test"]
+files = [
+    {file = "pytest-cov-4.1.0.tar.gz", hash = "sha256:3904b13dfbfec47f003b8e77fd5b589cd11904a21ddf1ab38a64f204d6a10ef6"},
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+]
+
+[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 = "3.14.1"
+description = "Thin-wrapper around the mock package for easier use with pytest"
+optional = false
+python-versions = ">=3.8"
+groups = ["test"]
+files = [
+    {file = "pytest_mock-3.14.1-py3-none-any.whl", hash = "sha256:178aefcd11307d874b4cd3100344e7e2d888d9791a6a1d9bfe90fbc1b74fd1d0"},
+    {file = "pytest_mock-3.14.1.tar.gz", hash = "sha256:159e9edac4c451ce77a5cdb9fc5d1100708d2dd4ba3c3df572f14097351af80e"},
+]
+
+[package.dependencies]
+pytest = ">=6.2.5"
+
+[package.extras]
+dev = ["pre-commit", "pytest-asyncio", "tox"]
+
+[[package]]
+name = "tomli"
+version = "2.2.1"
+description = "A lil' TOML parser"
+optional = false
+python-versions = ">=3.8"
+groups = ["test"]
+markers = "python_full_version <= \"3.11.0a6\""
+files = [
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+    {file = "tomli-2.2.1-cp313-cp313-win32.whl", hash = "sha256:d3f5614314d758649ab2ab3a62d4f2004c825922f9e370b29416484086b264ec"},
+    {file = "tomli-2.2.1-cp313-cp313-win_amd64.whl", hash = "sha256:a38aa0308e754b0e3c67e344754dff64999ff9b513e691d0e786265c93583c69"},
+    {file = "tomli-2.2.1-py3-none-any.whl", hash = "sha256:cb55c73c5f4408779d0cf3eef9f762b9c9f147a77de7b258bef0a5628adc85cc"},
+    {file = "tomli-2.2.1.tar.gz", hash = "sha256:cd45e1dc79c835ce60f7404ec8119f2eb06d38b1deba146f07ced3bbc44505ff"},
+]
+
+[[package]]
+name = "typing-extensions"
+version = "4.13.2"
+description = "Backported and Experimental Type Hints for Python 3.8+"
+optional = false
+python-versions = ">=3.8"
+groups = ["test"]
+markers = "python_version < \"3.11\""
+files = [
+    {file = "typing_extensions-4.13.2-py3-none-any.whl", hash = "sha256:a439e7c04b49fec3e5d3e2beaa21755cadbbdc391694e28ccdd36ca4a1408f8c"},
+    {file = "typing_extensions-4.13.2.tar.gz", hash = "sha256:e6c81219bd689f51865d9e372991c540bda33a0379d5573cddb9a3a23f7caaef"},
+]
+
+[metadata]
+lock-version = "2.1"
+python-versions = "^3.8"
+content-hash = "6738456f28abc0f0076aee7b692351770d49f6bd7592ece4bd2fc0daeb0af776"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 000000000..995daf224
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,77 @@
+[tool.poetry]
+name = "v8-tools"
+version = "0.1.0"
+description = "V8 tools and utilities"
+authors = ["Your Name <your.email@example.com>"]
+readme = "README.md"
+package-mode = false
+
+[tool.poetry.dependencies]
+python = "^3.8"
+
+[tool.poetry.group.test.dependencies]
+pytest = "^7.4.0"
+pytest-cov = "^4.1.0"
+pytest-mock = "^3.11.0"
+
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py", "*_test.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = [
+    "--strict-markers",
+    "--strict-config",
+    "--verbose",
+    "--cov=.",
+    "--cov-report=term-missing",
+    "--cov-report=html:htmlcov",
+    "--cov-report=xml:coverage.xml",
+    "--cov-fail-under=80",
+]
+markers = [
+    "unit: marks tests as unit tests",
+    "integration: marks tests as integration tests",
+    "slow: marks tests as slow running",
+]
+
+[tool.coverage.run]
+source = ["."]
+omit = [
+    "*/tests/*",
+    "*/test_*.py",
+    "*/__pycache__/*",
+    "*/venv/*",
+    "*/virtualenv/*",
+    "*/.venv/*",
+    "*/.tox/*",
+    "*/build/*",
+    "*/dist/*",
+]
+
+[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
+
+[tool.coverage.html]
+directory = "htmlcov"
+
+[tool.coverage.xml]
+output = "coverage.xml"
\ No newline at end of file
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 000000000..93a2d4b23
--- /dev/null
+++ b/tests/__init__.py
@@ -0,0 +1 @@
+# Test package initialization
\ No newline at end of file
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 000000000..914a6d087
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,157 @@
+"""Shared pytest fixtures for all tests."""
+import tempfile
+import pytest
+from pathlib import Path
+from unittest.mock import Mock, patch
+import os
+import shutil
+
+
+@pytest.fixture
+def temp_dir():
+    """Create a temporary directory for test files."""
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        yield Path(tmp_dir)
+
+
+@pytest.fixture
+def temp_file():
+    """Create a temporary file for tests."""
+    with tempfile.NamedTemporaryFile(delete=False) as tmp_file:
+        yield Path(tmp_file.name)
+    # Clean up
+    try:
+        os.unlink(tmp_file.name)
+    except FileNotFoundError:
+        pass
+
+
+@pytest.fixture
+def mock_subprocess():
+    """Mock subprocess.run for testing command execution."""
+    with patch('subprocess.run') as mock_run:
+        mock_run.return_value.returncode = 0
+        mock_run.return_value.stdout = b"mock output"
+        mock_run.return_value.stderr = b""
+        yield mock_run
+
+
+@pytest.fixture
+def mock_git():
+    """Mock git commands for testing."""
+    with patch('subprocess.run') as mock_run:
+        mock_run.return_value.returncode = 0
+        mock_run.return_value.stdout = b"mock git output"
+        mock_run.return_value.check_returncode.return_value = None
+        yield mock_run
+
+
+@pytest.fixture
+def sample_config():
+    """Provide sample configuration data for tests."""
+    return {
+        "destination": "/tmp/test",
+        "v8_git": "/tmp/v8",
+        "oldest_version": (8, 6),
+        "branches": ["main", "10.0-lkgr"]
+    }
+
+
+@pytest.fixture
+def mock_path_exists():
+    """Mock Path.exists() method for testing file system operations."""
+    with patch.object(Path, 'exists') as mock_exists:
+        mock_exists.return_value = True
+        yield mock_exists
+
+
+@pytest.fixture
+def mock_file_operations():
+    """Mock file read/write operations."""
+    mock_data = {}
+    
+    def mock_read_text(self):
+        return mock_data.get(str(self), "")
+    
+    def mock_write_text(self, content):
+        mock_data[str(self)] = content
+    
+    with patch.object(Path, 'read_text', mock_read_text), \
+         patch.object(Path, 'write_text', mock_write_text):
+        yield mock_data
+
+
+@pytest.fixture
+def mock_environment():
+    """Mock environment variables for testing."""
+    original_env = os.environ.copy()
+    test_env = {
+        "HOME": "/tmp/test_home",
+        "PATH": "/usr/bin:/bin",
+        "PYTHONPATH": "/tmp/test_python"
+    }
+    os.environ.update(test_env)
+    yield test_env
+    os.environ.clear()
+    os.environ.update(original_env)
+
+
+@pytest.fixture
+def capture_output():
+    """Capture stdout/stderr for testing print statements."""
+    import sys
+    from io import StringIO
+    
+    old_stdout = sys.stdout
+    old_stderr = sys.stderr
+    stdout_capture = StringIO()
+    stderr_capture = StringIO()
+    
+    sys.stdout = stdout_capture
+    sys.stderr = stderr_capture
+    
+    yield stdout_capture, stderr_capture
+    
+    sys.stdout = old_stdout
+    sys.stderr = old_stderr
+
+
+@pytest.fixture
+def mock_network():
+    """Mock network requests for testing."""
+    with patch('urllib.request.urlopen') as mock_urlopen:
+        mock_response = Mock()
+        mock_response.read.return_value = b'{"status": "ok"}'
+        mock_urlopen.return_value.__enter__.return_value = mock_response
+        yield mock_urlopen
+
+
+@pytest.fixture(autouse=True)
+def cleanup_test_files():
+    """Automatically clean up any test files after each test."""
+    yield
+    # Clean up any test files that might have been created
+    test_patterns = [
+        "*.tmp",
+        "test_*.log"
+    ]
+    for pattern in test_patterns:
+        for file_path in Path.cwd().glob(pattern):
+            try:
+                if file_path.is_file():
+                    file_path.unlink()
+                elif file_path.is_dir():
+                    shutil.rmtree(file_path)
+            except (OSError, PermissionError):
+                pass  # Ignore cleanup failures
+
+
+@pytest.fixture
+def mock_logger():
+    """Mock logger for testing logging functionality."""
+    logger = Mock()
+    logger.info = Mock()
+    logger.error = Mock()
+    logger.warning = Mock()
+    logger.debug = Mock()
+    return logger
\ No newline at end of file
diff --git a/tests/integration/__init__.py b/tests/integration/__init__.py
new file mode 100644
index 000000000..05065e853
--- /dev/null
+++ b/tests/integration/__init__.py
@@ -0,0 +1 @@
+# Integration test package initialization
\ No newline at end of file
diff --git a/tests/test_infrastructure_validation.py b/tests/test_infrastructure_validation.py
new file mode 100644
index 000000000..4eb3e0685
--- /dev/null
+++ b/tests/test_infrastructure_validation.py
@@ -0,0 +1,134 @@
+"""Validation tests to verify the testing infrastructure is properly set up."""
+import pytest
+import sys
+import subprocess
+from pathlib import Path
+from unittest.mock import Mock, patch
+
+
+class TestInfrastructureValidation:
+    """Test cases to validate the testing infrastructure setup."""
+    
+    def test_pytest_basic_functionality(self):
+        """Test that pytest is working correctly."""
+        assert True
+    
+    def test_pytest_markers(self):
+        """Test that custom pytest markers are configured."""
+        # This test itself uses a marker
+        pass
+    
+    @pytest.mark.unit
+    def test_unit_marker(self):
+        """Test that unit marker works."""
+        assert True
+    
+    @pytest.mark.integration
+    def test_integration_marker(self):
+        """Test that integration marker works."""
+        assert True
+    
+    @pytest.mark.slow
+    def test_slow_marker(self):
+        """Test that slow marker works."""
+        assert True
+    
+    def test_temp_dir_fixture(self, temp_dir):
+        """Test that temp_dir fixture works correctly."""
+        assert temp_dir.exists()
+        assert temp_dir.is_dir()
+        
+        # Create a test file in the temp directory
+        test_file = temp_dir / "test_file.txt"
+        test_file.write_text("test content")
+        assert test_file.exists()
+        assert test_file.read_text() == "test content"
+    
+    def test_temp_file_fixture(self, temp_file):
+        """Test that temp_file fixture works correctly."""
+        assert temp_file.exists()
+        temp_file.write_text("test content")
+        assert temp_file.read_text() == "test content"
+    
+    def test_mock_subprocess_fixture(self, mock_subprocess):
+        """Test that mock_subprocess fixture works correctly."""
+        # Import subprocess inside the test to use the mocked version
+        import subprocess
+        result = subprocess.run(["echo", "test"])
+        
+        assert mock_subprocess.called
+        assert result.returncode == 0
+    
+    def test_sample_config_fixture(self, sample_config):
+        """Test that sample_config fixture provides expected data."""
+        assert isinstance(sample_config, dict)
+        assert "destination" in sample_config
+        assert "v8_git" in sample_config
+        assert "oldest_version" in sample_config
+        assert "branches" in sample_config
+    
+    def test_mock_file_operations_fixture(self, mock_file_operations):
+        """Test that mock_file_operations fixture works correctly."""
+        test_path = Path("/test/path")
+        
+        # Mock writing and reading
+        with patch.object(Path, 'read_text', lambda self: mock_file_operations.get(str(self), "")):
+            with patch.object(Path, 'write_text', lambda self, content: mock_file_operations.update({str(self): content})):
+                test_path.write_text("test content")
+                assert mock_file_operations[str(test_path)] == "test content"
+    
+    def test_capture_output_fixture(self, capture_output):
+        """Test that capture_output fixture works correctly."""
+        stdout_capture, stderr_capture = capture_output
+        
+        # pytest already captures output, so we test the fixture exists
+        assert hasattr(stdout_capture, 'getvalue')
+        assert hasattr(stderr_capture, 'getvalue')
+    
+    def test_mock_logger_fixture(self, mock_logger):
+        """Test that mock_logger fixture works correctly."""
+        assert hasattr(mock_logger, 'info')
+        assert hasattr(mock_logger, 'error')
+        assert hasattr(mock_logger, 'warning')
+        assert hasattr(mock_logger, 'debug')
+        
+        mock_logger.info("test message")
+        mock_logger.info.assert_called_with("test message")
+    
+    def test_python_version_compatibility(self):
+        """Test that Python version is compatible."""
+        assert sys.version_info >= (3, 8), "Python 3.8 or higher required"
+    
+    def test_project_structure(self):
+        """Test that the project structure is set up correctly."""
+        project_root = Path.cwd()
+        
+        # Check for essential files
+        assert (project_root / "pyproject.toml").exists()
+        assert (project_root / "tests").exists()
+        assert (project_root / "tests" / "__init__.py").exists()
+        assert (project_root / "tests" / "conftest.py").exists()
+        assert (project_root / "tests" / "unit").exists()
+        assert (project_root / "tests" / "unit" / "__init__.py").exists()
+        assert (project_root / "tests" / "integration").exists()
+        assert (project_root / "tests" / "integration" / "__init__.py").exists()
+    
+    def test_coverage_functionality(self):
+        """Test that coverage tracking would work (this test itself contributes to coverage)."""
+        def sample_function():
+            return "covered"
+        
+        result = sample_function()
+        assert result == "covered"
+    
+    def test_pytest_mock_functionality(self):
+        """Test that pytest-mock functionality works."""
+        with patch('os.path.exists') as mock_exists:
+            mock_exists.return_value = True
+            
+            # Test the mock works
+            import os.path
+            result = os.path.exists("dummy_file.txt")
+            
+            assert result is True
+            mock_exists.assert_called_once_with("dummy_file.txt")
\ No newline at end of file
diff --git a/tests/unit/__init__.py b/tests/unit/__init__.py
new file mode 100644
index 000000000..4a87602a6
--- /dev/null
+++ b/tests/unit/__init__.py
@@ -0,0 +1 @@
+# Unit test package initialization
\ No newline at end of file