diff --git a/.gitignore b/.gitignore
index 7e99e36..1e2608d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,78 @@
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\ No newline at end of file
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+develop-eggs/
+dist/
+downloads/
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+sdist/
+var/
+wheels/
+pip-wheel-metadata/
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+coverage.xml
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+env/
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+.virtualenv/
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+*.swp
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+
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+
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\ No newline at end of file
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new file mode 100644
index 0000000..fb96495
--- /dev/null
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+    {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\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+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 = ["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 = "55af3168dc7c764116055daca1451926a6bebd9ea4a3661130b1429ae23c91af"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..bd82671
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,95 @@
+[tool.poetry]
+name = "SimpleWebSocketServer"
+version = "0.1.1"
+description = "A Simple Websocket Server written in Python"
+authors = ["Dave Pallot <d.e.pallot@gmail.com>"]
+readme = "README.md"
+repository = "https://github.com/dpallot/simple-websocket-server/"
+classifiers = [
+    "Programming Language :: Python :: 2",
+    "Programming Language :: Python :: 3",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+]
+packages = [{include = "SimpleWebSocketServer"}]
+
+[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*"]
+python_functions = ["test_*"]
+addopts = [
+    "-v",
+    "--strict-markers",
+    "--tb=short",
+    "--cov=SimpleWebSocketServer",
+    "--cov-branch",
+    "--cov-report=term-missing:skip-covered",
+    "--cov-report=html:htmlcov",
+    "--cov-report=xml:coverage.xml",
+    "--cov-fail-under=9",  # TODO: Update to 80 when actual tests are written
+]
+markers = [
+    "unit: Unit tests",
+    "integration: Integration tests",
+    "slow: Slow running tests",
+]
+filterwarnings = [
+    "error",
+    "ignore::UserWarning",
+    "ignore::DeprecationWarning",
+]
+
+[tool.coverage.run]
+source = ["SimpleWebSocketServer"]
+branch = true
+omit = [
+    "*/tests/*",
+    "*/__pycache__/*",
+    "*/venv/*",
+    "*/virtualenv/*",
+    "*/.venv/*",
+    "*/.virtualenv/*",
+]
+
+[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"
\ 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..65c1e19
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,122 @@
+"""Shared pytest fixtures and configuration for all tests."""
+
+import os
+import sys
+import tempfile
+import shutil
+from contextlib import contextmanager
+from unittest.mock import Mock, patch
+
+import pytest
+
+# Add the project root to the Python path
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+
+
+@pytest.fixture
+def temp_dir():
+    """Create a temporary directory for test files."""
+    temp_path = tempfile.mkdtemp()
+    yield temp_path
+    # Cleanup after test
+    shutil.rmtree(temp_path, ignore_errors=True)
+
+
+@pytest.fixture
+def mock_websocket():
+    """Create a mock websocket client for testing."""
+    mock_ws = Mock()
+    mock_ws.address = ('127.0.0.1', 12345)
+    mock_ws.data = None
+    mock_ws.send = Mock()
+    mock_ws.close = Mock()
+    return mock_ws
+
+
+@pytest.fixture
+def mock_server():
+    """Create a mock websocket server instance."""
+    with patch('SimpleWebSocketServer.SimpleWebSocketServer.SimpleWebSocketServer') as mock:
+        server = mock.return_value
+        server.serveforever = Mock()
+        server.close = Mock()
+        yield server
+
+
+@pytest.fixture
+def sample_config():
+    """Provide sample configuration for testing."""
+    return {
+        'host': '127.0.0.1',
+        'port': 8000,
+        'ssl': False,
+        'certfile': None,
+        'keyfile': None,
+        'version': 'tls'
+    }
+
+
+@pytest.fixture
+def mock_ssl_context():
+    """Create a mock SSL context for testing HTTPS functionality."""
+    with patch('ssl.SSLContext') as mock_context:
+        context = mock_context.return_value
+        context.load_cert_chain = Mock()
+        yield context
+
+
+@contextmanager
+def capture_stdout():
+    """Context manager to capture stdout output."""
+    import io
+    old_stdout = sys.stdout
+    sys.stdout = buffer = io.StringIO()
+    try:
+        yield buffer
+    finally:
+        sys.stdout = old_stdout
+
+
+@pytest.fixture
+def capture_output():
+    """Fixture to capture stdout output during tests."""
+    with capture_stdout() as buffer:
+        yield buffer
+
+
+@pytest.fixture(autouse=True)
+def reset_modules():
+    """Reset imported modules to ensure test isolation."""
+    # Store original modules
+    original_modules = sys.modules.copy()
+    yield
+    # Restore original modules
+    for module in list(sys.modules.keys()):
+        if module.startswith('SimpleWebSocketServer') and module in original_modules:
+            sys.modules[module] = original_modules[module]
+
+
+@pytest.fixture
+def sample_websocket_message():
+    """Provide sample websocket messages for testing."""
+    return {
+        'text': b'Hello, WebSocket!',
+        'binary': b'\x00\x01\x02\x03\x04',
+        'ping': b'ping',
+        'pong': b'pong',
+        'close': b'\x03\xe8'  # Close frame with code 1000
+    }
+
+
+def pytest_configure(config):
+    """Configure pytest with custom settings."""
+    # Register custom markers
+    config.addinivalue_line(
+        "markers", "unit: mark test as a unit test"
+    )
+    config.addinivalue_line(
+        "markers", "integration: mark test as an integration test"
+    )
+    config.addinivalue_line(
+        "markers", "slow: mark test as slow running"
+    )
\ 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/test_infrastructure_validation.py b/tests/test_infrastructure_validation.py
new file mode 100644
index 0000000..ab3db44
--- /dev/null
+++ b/tests/test_infrastructure_validation.py
@@ -0,0 +1,103 @@
+"""Validation tests to ensure the testing infrastructure is properly set up."""
+
+import os
+import sys
+import pytest
+
+
+class TestInfrastructureValidation:
+    """Validate that the testing infrastructure is properly configured."""
+
+    def test_pytest_is_available(self):
+        """Verify pytest is installed and accessible."""
+        assert pytest.__version__ is not None
+        
+    def test_project_is_importable(self):
+        """Verify the main project package can be imported."""
+        import SimpleWebSocketServer
+        assert SimpleWebSocketServer is not None
+        
+    def test_test_directories_exist(self):
+        """Verify test directory structure exists."""
+        test_root = os.path.dirname(__file__)
+        assert os.path.exists(test_root)
+        assert os.path.exists(os.path.join(test_root, 'unit'))
+        assert os.path.exists(os.path.join(test_root, 'integration'))
+        
+    def test_conftest_fixtures_available(self, temp_dir, mock_websocket, sample_config):
+        """Verify conftest fixtures are available and working."""
+        # Test temp_dir fixture
+        assert os.path.exists(temp_dir)
+        assert os.path.isdir(temp_dir)
+        
+        # Test mock_websocket fixture
+        assert mock_websocket is not None
+        assert hasattr(mock_websocket, 'send')
+        assert hasattr(mock_websocket, 'close')
+        
+        # Test sample_config fixture
+        assert isinstance(sample_config, dict)
+        assert 'host' in sample_config
+        assert 'port' in sample_config
+        
+    @pytest.mark.unit
+    def test_unit_marker_works(self):
+        """Verify unit test marker is registered."""
+        assert True
+        
+    @pytest.mark.integration
+    def test_integration_marker_works(self):
+        """Verify integration test marker is registered."""
+        assert True
+        
+    @pytest.mark.slow
+    def test_slow_marker_works(self):
+        """Verify slow test marker is registered."""
+        assert True
+        
+    def test_coverage_module_available(self):
+        """Verify pytest-cov is installed for coverage reporting."""
+        try:
+            import pytest_cov
+            assert pytest_cov is not None
+        except ImportError:
+            pytest.fail("pytest-cov is not installed")
+            
+    def test_mock_module_available(self):
+        """Verify pytest-mock is installed for mocking."""
+        try:
+            import pytest_mock
+            assert pytest_mock is not None
+        except ImportError:
+            pytest.fail("pytest-mock is not installed")
+            
+    def test_python_path_includes_project_root(self):
+        """Verify the project root is in Python path."""
+        project_root = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
+        assert project_root in sys.path or any(os.path.samefile(project_root, p) for p in sys.path if os.path.exists(p))
+
+
+@pytest.mark.parametrize("fixture_name", [
+    "temp_dir",
+    "mock_websocket", 
+    "mock_server",
+    "sample_config",
+    "mock_ssl_context",
+    "capture_output",
+    "sample_websocket_message"
+])
+def test_fixture_exists(fixture_name, request):
+    """Verify all expected fixtures are available."""
+    try:
+        request.getfixturevalue(fixture_name)
+    except pytest.FixtureLookupError:
+        pytest.fail(f"Fixture '{fixture_name}' is not available")
+
+
+def test_capture_output_works(capture_output):
+    """Verify the capture_output fixture works correctly."""
+    # The capture_output fixture captures output written during the test
+    # We need to write to the buffer directly
+    capture_output.write("Test output")
+    output = capture_output.getvalue()
+    assert "Test output" in output
\ No newline at end of file
diff --git a/tests/unit/__init__.py b/tests/unit/__init__.py
new file mode 100644
index 0000000..e69de29