diff --git a/.gitignore b/.gitignore
index 0d20b64..feb6688 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,34 @@
 *.pyc
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+coverage.xml
+.tox/
+
+# Build artifacts
+build/
+dist/
+*.egg-info/
+__pycache__/
+
+# Virtual environments
+venv/
+env/
+.env
+.venv/
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Claude settings
+.claude/*
+
+# OS files
+.DS_Store
+Thumbs.db
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..8daa9ea
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,218 @@
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+
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+
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+    {file = "coverage-7.10.6-py3-none-any.whl", hash = "sha256:92c4ecf6bf11b2e85fd4d8204814dc26e6a19f0c9d938c207c5cb0eadfcabbe3"},
+    {file = "coverage-7.10.6.tar.gz", hash = "sha256:f644a3ae5933a552a29dbb9aa2f90c677a875f80ebea028e5a52a4f429044b90"},
+]
+
+[package.extras]
+toml = ["tomli ; python_full_version <= \"3.11.0a6\""]
+
+[[package]]
+name = "iniconfig"
+version = "2.1.0"
+description = "brain-dead simple config-ini parsing"
+optional = false
+python-versions = ">=3.8"
+groups = ["test"]
+files = [
+    {file = "iniconfig-2.1.0-py3-none-any.whl", hash = "sha256:9deba5723312380e77435581c6bf4935c94cbfab9b1ed33ef8d238ea168eb760"},
+    {file = "iniconfig-2.1.0.tar.gz", hash = "sha256:3abbd2e30b36733fee78f9c7f7308f2d0050e88f0087fd25c2645f63c773e1c7"},
+]
+
+[[package]]
+name = "packaging"
+version = "25.0"
+description = "Core utilities for Python packages"
+optional = false
+python-versions = ">=3.8"
+groups = ["test"]
+files = [
+    {file = "packaging-25.0-py3-none-any.whl", hash = "sha256:29572ef2b1f17581046b3a2227d5c611fb25ec70ca1ba8554b24b0e69331a484"},
+    {file = "packaging-25.0.tar.gz", hash = "sha256:d443872c98d677bf60f6a1f2f8c1cb748e8fe762d2bf9d3148b5599295b0fc4f"},
+]
+
+[[package]]
+name = "pluggy"
+version = "1.6.0"
+description = "plugin and hook calling mechanisms for python"
+optional = false
+python-versions = ">=3.9"
+groups = ["test"]
+files = [
+    {file = "pluggy-1.6.0-py3-none-any.whl", hash = "sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746"},
+    {file = "pluggy-1.6.0.tar.gz", hash = "sha256:7dcc130b76258d33b90f61b658791dede3486c3e6bfb003ee5c9bfb396dd22f3"},
+]
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["coverage", "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\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+
+[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"},
+    {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 = "3.14.1"
+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"]
+
+[metadata]
+lock-version = "2.1"
+python-versions = "^3.11"
+content-hash = "cc1d69259f8ab8750b2ce2edbec8368fefb620fad947bdb171cea40b7dd37116"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..0b5bee6
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,83 @@
+[tool.poetry]
+name = "shiftpi"
+version = "0.2"
+description = "ShiftPi is the easiest way to work with 74HC595 shift registers on your Raspberry Pi in Arduino style :). If you are an Arduino fan ... you'l love it :)"
+authors = ["Marian Ignev <m@ignev.net>"]
+readme = "README.md"
+homepage = "http://m.ignev.net/code/shiftpi"
+packages = [{include = "shiftpi.py"}]
+classifiers = [
+    "Operating System :: POSIX",
+    "Operating System :: POSIX :: BSD",
+    "Operating System :: POSIX :: Linux",
+    "Operating System :: Unix",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.11",
+    "Topic :: System :: Shells",
+    "Topic :: Utilities",
+]
+
+[tool.poetry.dependencies]
+python = "^3.11"
+# RPi.GPIO = "*"  # Uncommented from original setup.py
+
+[tool.poetry.group.test.dependencies]
+pytest = "^7.4.0"
+pytest-cov = "^4.1.0"
+pytest-mock = "^3.11.0"
+
+[tool.poetry.scripts]
+test = "pytest:main"
+tests = "pytest:main"
+
+[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=shiftpi",
+    "--cov-report=term-missing",
+    "--cov-report=html:htmlcov",
+    "--cov-report=xml:coverage.xml",
+    "--cov-fail-under=80",
+]
+markers = [
+    "unit: marks tests as unit tests (fast isolated tests)",
+    "integration: marks tests as integration tests (slower tests with dependencies)",
+    "slow: marks tests as slow running tests",
+]
+
+[tool.coverage.run]
+source = ["shiftpi"]
+omit = [
+    "tests/*",
+    "setup.py",
+    "*/__init__.py",
+]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "def __repr__",
+    "raise AssertionError",
+    "raise NotImplementedError",
+    "if __name__ == .__main__.:",
+    "if TYPE_CHECKING:",
+]
+show_missing = true
+precision = 2
+
+[tool.coverage.html]
+directory = "htmlcov"
+
+[tool.coverage.xml]
+output = "coverage.xml"
\ No newline at end of file
diff --git a/shiftpi.py b/shiftpi.py
index 074b453..1640f00 100644
--- a/shiftpi.py
+++ b/shiftpi.py
@@ -65,7 +65,7 @@ def startupMode(mode, execute = False):
         else:
             raise ValueError("The mode can be only HIGH or LOW or Dictionary with specific pins and modes")
     elif isinstance(mode, dict):
-        for pin, mode in mode.iteritems():
+        for pin, mode in mode.items():
             _setPin(pin, mode)
         if execute:
             _execute()
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..e51c6e6
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,101 @@
+"""
+Shared pytest fixtures for the shiftpi testing suite.
+"""
+
+import pytest
+import tempfile
+import os
+import shutil
+import sys
+from unittest.mock import Mock, patch, MagicMock
+
+# Mock RPi.GPIO at module level to allow imports
+mock_gpio = MagicMock()
+mock_gpio.BCM = 'BCM'
+mock_gpio.OUT = 'OUT'
+mock_gpio.HIGH = 1
+mock_gpio.LOW = 0
+mock_gpio.setmode = Mock()
+mock_gpio.setwarnings = Mock()
+mock_gpio.setup = Mock()
+mock_gpio.output = Mock()
+
+sys.modules['RPi'] = MagicMock()
+sys.modules['RPi.GPIO'] = mock_gpio
+
+
+@pytest.fixture
+def temp_dir():
+    """Create a temporary directory for tests."""
+    temp_path = tempfile.mkdtemp()
+    yield temp_path
+    shutil.rmtree(temp_path)
+
+
+@pytest.fixture
+def mock_gpio():
+    """Mock RPi.GPIO module for testing without hardware."""
+    with patch('shiftpi.GPIO') as mock_gpio_module:
+        mock_gpio_module.BCM = 'BCM'
+        mock_gpio_module.OUT = 'OUT'
+        mock_gpio_module.HIGH = 1
+        mock_gpio_module.LOW = 0
+        
+        mock_gpio_module.setmode = Mock()
+        mock_gpio_module.setwarnings = Mock()
+        mock_gpio_module.setup = Mock()
+        mock_gpio_module.output = Mock()
+        
+        yield mock_gpio_module
+
+
+@pytest.fixture
+def mock_config():
+    """Provide a mock configuration for testing."""
+    return {
+        'ser_pin': 25,
+        'rclk_pin': 24,
+        'srclk_pin': 23,
+        'num_registers': 1
+    }
+
+
+@pytest.fixture
+def sample_pin_states():
+    """Provide sample pin states for testing."""
+    return [0, 1, 0, 1, 1, 0, 1, 0]  # 8 pins worth of test data
+
+
+@pytest.fixture(autouse=True)
+def reset_shiftpi_globals():
+    """Reset shiftpi global variables before each test."""
+    import shiftpi
+    
+    # Reset global variables to their initial state
+    shiftpi._SER_pin = 25
+    shiftpi._RCLK_pin = 24
+    shiftpi._SRCLK_pin = 23
+    shiftpi._registers = list()
+    shiftpi._number_of_shiftregisters = 1
+    
+    yield
+    
+    # Clean up after test
+    shiftpi._registers = list()
+
+
+@pytest.fixture
+def temp_file():
+    """Create a temporary file for tests."""
+    fd, temp_path = tempfile.mkstemp()
+    os.close(fd)
+    yield temp_path
+    if os.path.exists(temp_path):
+        os.remove(temp_path)
+
+
+@pytest.fixture
+def mock_sleep():
+    """Mock time.sleep for faster tests."""
+    with patch('shiftpi.sleep') as mock_sleep_func:
+        yield mock_sleep_func
\ 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_setup_validation.py b/tests/test_setup_validation.py
new file mode 100644
index 0000000..74b41b9
--- /dev/null
+++ b/tests/test_setup_validation.py
@@ -0,0 +1,76 @@
+"""
+Validation tests to ensure the testing infrastructure is properly set up.
+"""
+
+import pytest
+import os
+import sys
+
+
+def test_pytest_is_working():
+    """Basic test to ensure pytest is running correctly."""
+    assert True
+
+
+def test_project_structure():
+    """Test that the project structure is as expected."""
+    # Check that main module exists
+    assert os.path.exists('shiftpi.py')
+    
+    # Check that testing directories exist
+    assert os.path.isdir('tests')
+    assert os.path.isdir('tests/unit')
+    assert os.path.isdir('tests/integration')
+
+
+def test_shiftpi_import():
+    """Test that the main shiftpi module can be imported."""
+    try:
+        import shiftpi
+        assert hasattr(shiftpi, 'version')
+        assert shiftpi.version == "0.2"
+    except ImportError:
+        pytest.fail("Could not import shiftpi module")
+
+
+def test_fixtures_available(temp_dir, mock_config):
+    """Test that shared fixtures from conftest.py are available."""
+    # Test temp_dir fixture
+    assert os.path.isdir(temp_dir)
+    
+    # Test mock_config fixture
+    assert isinstance(mock_config, dict)
+    assert 'ser_pin' in mock_config
+
+
+def test_mock_gpio_fixture(mock_gpio):
+    """Test that GPIO mocking fixture works."""
+    assert mock_gpio is not None
+    assert hasattr(mock_gpio, 'setup')
+    assert hasattr(mock_gpio, 'output')
+
+
+@pytest.mark.unit
+def test_unit_marker():
+    """Test that custom markers work."""
+    assert True
+
+
+@pytest.mark.integration
+def test_integration_marker():
+    """Test that custom markers work."""
+    assert True
+
+
+@pytest.mark.slow
+def test_slow_marker():
+    """Test that custom markers work."""
+    assert True
+
+
+def test_coverage_measurement():
+    """Test that this test file is being measured for coverage."""
+    # This test itself helps ensure coverage measurement is working
+    # by providing a test that will show up in coverage reports
+    covered_line = True
+    assert covered_line
\ 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