diff --git a/.gitignore b/.gitignore
index f82a459..719c00b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -104,3 +104,49 @@ venv.bak/
 .mypy_cache/
 
 .idea/
+
+# Testing
+.pytest_cache/
+.coverage
+.coverage.*
+htmlcov/
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+pytest_cache/
+.tox/
+
+# Claude settings
+.claude/*
+
+# Virtual environments
+.venv/
+venv/
+ENV/
+env/
+.python-version
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Build artifacts
+build/
+dist/
+*.egg-info/
+*.egg
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.so
+__pycache__/
+*.py[cod]
+*$py.class
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..2bcacf9
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,332 @@
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+
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+typing-extensions = ">=4.0.0"
+
+[package.extras]
+cchardet = ["cchardet"]
+chardet = ["chardet"]
+charset-normalizer = ["charset-normalizer"]
+html5lib = ["html5lib"]
+lxml = ["lxml"]
+
+[[package]]
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+
+[package.extras]
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+
+[[package]]
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+
+[package.dependencies]
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+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 = ["dev"]
+files = [
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+]
+
+[package.dependencies]
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+
+[package.extras]
+dev = ["pre-commit", "pytest-asyncio", "tox"]
+
+[[package]]
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+version = "2.7"
+description = "A modern CSS selector implementation for Beautiful Soup."
+optional = false
+python-versions = ">=3.8"
+groups = ["main"]
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+]
+
+[[package]]
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+version = "2.2.1"
+description = "A lil' TOML parser"
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+markers = "python_full_version <= \"3.11.0a6\""
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+]
+
+[[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 = ["main", "dev"]
+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"},
+]
+markers = {dev = "python_version < \"3.11\""}
+
+[metadata]
+lock-version = "2.1"
+python-versions = "^3.8"
+content-hash = "82a50699a52f9f5c5a2c1495f45b9c59f11c62182564449417412913c173944a"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..7ace9a6
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,96 @@
+[tool.poetry]
+name = "drymail"
+version = "0.0.6"
+description = "Drymail is a minimalist wrapper over Python's existing smtplib and email libraries, designed to be friendly but unrestrictive."
+authors = ["Sumit Ghosh <sumit@sumit-ghosh.com>"]
+license = "MIT"
+readme = "README.md"
+homepage = "https://github.com/SkullTech/drymail"
+repository = "https://github.com/SkullTech/drymail"
+keywords = ["smtp", "email"]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: Developers",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+    "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",
+    "Programming Language :: Python :: 3.12"
+]
+packages = [{include = "drymail.py"}]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+mistune = "*"
+beautifulsoup4 = "*"
+
+[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"
+testpaths = ["tests"]
+python_files = ["test_*.py", "*_test.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = [
+    "-ra",
+    "--strict-markers",
+    "--strict-config",
+    "--cov=drymail",
+    "--cov-branch",
+    "--cov-report=term-missing:skip-covered",
+    "--cov-report=html",
+    "--cov-report=xml",
+    "--cov-fail-under=80"
+]
+markers = [
+    "unit: Unit tests",
+    "integration: Integration tests",
+    "slow: Slow tests"
+]
+
+[tool.coverage.run]
+source = ["drymail"]
+branch = true
+omit = [
+    "*/tests/*",
+    "*/test_*",
+    "*/__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__.:",
+    "class .*\\bProtocol\\):",
+    "@(abc\\.)?abstractmethod"
+]
+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"
\ 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..c543a9e
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,114 @@
+"""Shared pytest fixtures and configuration for drymail tests."""
+
+import os
+import tempfile
+from pathlib import Path
+from unittest.mock import Mock, MagicMock
+import pytest
+
+
+@pytest.fixture
+def temp_dir():
+    """Provide a temporary directory for test files."""
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        yield Path(tmp_dir)
+
+
+@pytest.fixture
+def mock_smtp_server():
+    """Mock SMTP server for testing email functionality."""
+    server = MagicMock()
+    server.send_message = MagicMock(return_value=None)
+    server.sendmail = MagicMock(return_value={})
+    server.quit = MagicMock(return_value=None)
+    server.__enter__ = MagicMock(return_value=server)
+    server.__exit__ = MagicMock(return_value=None)
+    return server
+
+
+@pytest.fixture
+def mock_email_config():
+    """Provide mock email configuration."""
+    return {
+        'host': 'smtp.example.com',
+        'port': 587,
+        'user': 'test@example.com',
+        'password': 'test_password',
+        'ssl': False,
+        'tls': True
+    }
+
+
+@pytest.fixture
+def sample_email_data():
+    """Provide sample email data for testing."""
+    return {
+        'sender': 'sender@example.com',
+        'receivers': ['receiver1@example.com', 'receiver2@example.com'],
+        'subject': 'Test Email Subject',
+        'text': 'This is a test email body.',
+        'html': '<h1>This is a test email body.</h1>',
+        'attachments': []
+    }
+
+
+@pytest.fixture
+def mock_attachment():
+    """Provide a mock file attachment."""
+    attachment = Mock()
+    attachment.name = 'test_file.txt'
+    attachment.read = Mock(return_value=b'Test file content')
+    return attachment
+
+
+@pytest.fixture
+def temp_file(temp_dir):
+    """Create a temporary file and return its path."""
+    def _create_temp_file(filename='test.txt', content='Test content'):
+        file_path = temp_dir / filename
+        file_path.write_text(content)
+        return file_path
+    return _create_temp_file
+
+
+@pytest.fixture(autouse=True)
+def reset_environment():
+    """Reset environment variables before each test."""
+    original_env = os.environ.copy()
+    yield
+    os.environ.clear()
+    os.environ.update(original_env)
+
+
+@pytest.fixture
+def capture_logs():
+    """Capture log messages during tests."""
+    import logging
+    from io import StringIO
+    
+    log_capture = StringIO()
+    handler = logging.StreamHandler(log_capture)
+    handler.setLevel(logging.DEBUG)
+    
+    logger = logging.getLogger()
+    original_level = logger.level
+    logger.setLevel(logging.DEBUG)
+    logger.addHandler(handler)
+    
+    yield log_capture
+    
+    logger.removeHandler(handler)
+    logger.setLevel(original_level)
+
+
+def pytest_configure(config):
+    """Configure pytest with 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..173738f
--- /dev/null
+++ b/tests/test_infrastructure_validation.py
@@ -0,0 +1,106 @@
+"""Validation tests to verify the testing infrastructure is properly set up."""
+
+import pytest
+import tempfile
+from pathlib import Path
+from unittest.mock import Mock
+
+
+class TestInfrastructureValidation:
+    """Test class to validate pytest infrastructure."""
+    
+    @pytest.mark.unit
+    def test_pytest_is_working(self):
+        """Verify that pytest can discover and run tests."""
+        assert True
+        assert 1 + 1 == 2
+    
+    @pytest.mark.unit
+    def test_fixtures_are_available(self, temp_dir, mock_smtp_server, mock_email_config):
+        """Verify that custom fixtures from conftest.py are accessible."""
+        assert isinstance(temp_dir, Path)
+        assert temp_dir.exists()
+        assert temp_dir.is_dir()
+        
+        assert mock_smtp_server is not None
+        assert hasattr(mock_smtp_server, 'send_message')
+        
+        assert isinstance(mock_email_config, dict)
+        assert 'host' in mock_email_config
+        assert mock_email_config['host'] == 'smtp.example.com'
+    
+    @pytest.mark.unit
+    def test_temp_file_fixture(self, temp_file):
+        """Verify that the temp_file fixture works correctly."""
+        test_file = temp_file('validation.txt', 'Test content for validation')
+        assert test_file.exists()
+        assert test_file.read_text() == 'Test content for validation'
+    
+    @pytest.mark.unit
+    def test_mocking_works(self, mocker):
+        """Verify that pytest-mock is properly installed and working."""
+        mock_func = mocker.Mock(return_value=42)
+        result = mock_func()
+        assert result == 42
+        mock_func.assert_called_once()
+    
+    @pytest.mark.unit
+    def test_coverage_is_tracked(self):
+        """Verify that code coverage is being tracked."""
+        def example_function(x, y):
+            if x > y:
+                return x
+            else:
+                return y
+        
+        assert example_function(5, 3) == 5
+        assert example_function(2, 7) == 7
+    
+    @pytest.mark.integration
+    def test_markers_work(self):
+        """Verify that custom markers are recognized."""
+        assert True
+    
+    @pytest.mark.slow
+    def test_slow_marker(self):
+        """Verify that the slow marker is recognized."""
+        import time
+        time.sleep(0.1)  # Simulate a slow test
+        assert True
+    
+    def test_sample_email_data_fixture(self, sample_email_data):
+        """Verify the sample_email_data fixture provides expected data."""
+        assert 'sender' in sample_email_data
+        assert 'receivers' in sample_email_data
+        assert isinstance(sample_email_data['receivers'], list)
+        assert len(sample_email_data['receivers']) == 2
+    
+    def test_mock_attachment_fixture(self, mock_attachment):
+        """Verify the mock_attachment fixture works correctly."""
+        assert mock_attachment.name == 'test_file.txt'
+        assert mock_attachment.read() == b'Test file content'
+    
+    def test_capture_logs_fixture(self, capture_logs):
+        """Verify the capture_logs fixture works correctly."""
+        import logging
+        logger = logging.getLogger(__name__)
+        logger.info("Test log message")
+        
+        log_output = capture_logs.getvalue()
+        assert "Test log message" in log_output
+
+
+def test_module_level_test():
+    """Verify that module-level tests are discovered."""
+    assert True
+
+
+@pytest.mark.parametrize("input,expected", [
+    (1, 2),
+    (2, 4),
+    (3, 6),
+    (4, 8),
+])
+def test_parametrized_tests(input, expected):
+    """Verify that parametrized tests work correctly."""
+    assert input * 2 == expected
\ 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