diff --git a/.gitignore b/.gitignore
index 894a44c..5f2c6c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -102,3 +102,16 @@ venv.bak/
 
 # mypy
 .mypy_cache/
+
+# Claude settings
+.claude/*
+
+# IDE files
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# Poetry
+poetry.lock is NOT ignored - this should be committed
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..aae71f4
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,282 @@
+# This file is automatically @generated by Poetry 2.1.3 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 = ["dev"]
+markers = "sys_platform == \"win32\""
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+]
+
+[[package]]
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+iniconfig = "*"
+packaging = "*"
+pluggy = ">=1.5,<2"
+tomli = {version = ">=1", markers = "python_version < \"3.11\""}
+
+[package.extras]
+dev = ["argcomplete", "attrs (>=19.2)", "hypothesis (>=3.56)", "mock", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
+
+[[package]]
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+description = "Pytest plugin for measuring coverage."
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+files = [
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+
+[package.dependencies]
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+pytest = ">=4.6"
+
+[package.extras]
+testing = ["fields", "hunter", "process-tests", "pytest-xdist", "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"]
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+
+[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 = ["dev"]
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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 = ["dev"]
+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 = "96176c9214534068f3ea7c00be51c23e9d99a8b4862eed2791d0a0cb449ad1e0"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..25c9885
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,81 @@
+[tool.poetry]
+name = "warmup-scheduler"
+version = "0.3.2"
+description = "Gradually Warm-up LR Scheduler for Pytorch"
+authors = ["Your Name <you@example.com>"]
+license = "MIT"
+readme = "README.md"
+homepage = "https://github.com/ildoonet/pytorch-gradual-warmup-lr"
+repository = "https://github.com/ildoonet/pytorch-gradual-warmup-lr"
+packages = [{include = "warmup_scheduler"}]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^8.0.0"
+pytest-cov = "^5.0.0"
+pytest-mock = "^3.14.0"
+
+[tool.poetry.scripts]
+test = "pytest:main"
+tests = "pytest:main"
+
+[tool.pytest.ini_options]
+minversion = "8.0"
+testpaths = ["tests"]
+python_files = ["test_*.py", "*_test.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = [
+    "-ra",
+    "--strict-markers",
+    "--cov=warmup_scheduler",
+    "--cov-report=term-missing",
+    "--cov-report=html",
+    "--cov-report=xml",
+    "-vv"
+]
+markers = [
+    "unit: Unit tests",
+    "integration: Integration tests",
+    "slow: Slow tests"
+]
+
+[tool.coverage.run]
+source = ["warmup_scheduler"]
+omit = [
+    "*/tests/*",
+    "*/__pycache__/*",
+    "*/venv/*",
+    "*/virtualenv/*",
+    "*/.venv/*",
+    "*/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"
+]
+skip_empty = true
+precision = 2
+fail_under = 80
+
+[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..9de3e0e
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,130 @@
+import pytest
+import tempfile
+import shutil
+from pathlib import Path
+from unittest.mock import Mock, patch
+import sys
+import os
+
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+
+
+@pytest.fixture
+def temp_dir():
+    """Create a temporary directory that is cleaned up after the test."""
+    temp_path = tempfile.mkdtemp()
+    yield Path(temp_path)
+    shutil.rmtree(temp_path)
+
+
+@pytest.fixture
+def mock_config():
+    """Provide a mock configuration object."""
+    config = Mock()
+    config.warmup_epochs = 5
+    config.base_lr = 0.001
+    config.warmup_factor = 0.1
+    config.total_epochs = 100
+    return config
+
+
+@pytest.fixture
+def mock_optimizer():
+    """Provide a mock optimizer for testing schedulers."""
+    optimizer = Mock()
+    optimizer.param_groups = [{'lr': 0.001}, {'lr': 0.01}]
+    return optimizer
+
+
+@pytest.fixture
+def mock_scheduler():
+    """Provide a mock base scheduler."""
+    scheduler = Mock()
+    scheduler.base_lrs = [0.001, 0.01]
+    scheduler.last_epoch = -1
+    scheduler.get_lr = Mock(return_value=[0.001, 0.01])
+    scheduler.get_last_lr = Mock(return_value=[0.001, 0.01])
+    scheduler.step = Mock()
+    return scheduler
+
+
+@pytest.fixture
+def capture_output():
+    """Capture stdout and stderr for testing print statements."""
+    import io
+    from contextlib import redirect_stdout, redirect_stderr
+    
+    class OutputCapture:
+        def __init__(self):
+            self.stdout = io.StringIO()
+            self.stderr = io.StringIO()
+            
+        def __enter__(self):
+            self._stdout_context = redirect_stdout(self.stdout)
+            self._stderr_context = redirect_stderr(self.stderr)
+            self._stdout_context.__enter__()
+            self._stderr_context.__enter__()
+            return self
+            
+        def __exit__(self, *args):
+            self._stdout_context.__exit__(*args)
+            self._stderr_context.__exit__(*args)
+            
+        def get_stdout(self):
+            return self.stdout.getvalue()
+            
+        def get_stderr(self):
+            return self.stderr.getvalue()
+    
+    return OutputCapture()
+
+
+@pytest.fixture
+def mock_torch_module():
+    """Mock torch module for testing without PyTorch dependency."""
+    with patch.dict('sys.modules', {'torch': Mock(), 'torch.optim': Mock(), 'torch.optim.lr_scheduler': Mock()}):
+        yield
+
+
+@pytest.fixture(autouse=True)
+def reset_imports():
+    """Reset imports between tests to ensure clean state."""
+    modules_to_remove = [m for m in sys.modules if m.startswith('warmup_scheduler')]
+    for module in modules_to_remove:
+        del sys.modules[module]
+    yield
+
+
+@pytest.fixture
+def sample_data():
+    """Provide sample data for testing."""
+    return {
+        'learning_rates': [0.001, 0.01, 0.1],
+        'epochs': list(range(100)),
+        'warmup_epochs': 5,
+        'multiplier': 8,
+        'total_epoch': 100
+    }
+
+
+@pytest.fixture
+def environment_vars():
+    """Temporarily set environment variables for testing."""
+    original_env = os.environ.copy()
+    
+    def _set_env(**kwargs):
+        os.environ.update(kwargs)
+        return os.environ
+    
+    yield _set_env
+    
+    os.environ.clear()
+    os.environ.update(original_env)
+
+
+@pytest.fixture
+def mock_time():
+    """Mock time-related functions for deterministic testing."""
+    with patch('time.time', return_value=1234567890):
+        with patch('time.sleep'):
+            yield
\ 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..0eb5a88
--- /dev/null
+++ b/tests/test_setup_validation.py
@@ -0,0 +1,131 @@
+import pytest
+import sys
+import os
+from pathlib import Path
+
+
+class TestSetupValidation:
+    """Validation tests to ensure the testing infrastructure is properly configured."""
+    
+    def test_pytest_import(self):
+        """Test that pytest can be imported."""
+        import pytest
+        assert pytest is not None
+    
+    def test_project_importable(self):
+        """Test that the main package can be imported."""
+        try:
+            import warmup_scheduler
+            assert warmup_scheduler.__version__ == '0.3.2'
+        except ModuleNotFoundError as e:
+            if "torch" in str(e):
+                pytest.skip("PyTorch not installed - this is expected for infrastructure setup")
+            else:
+                raise
+    
+    def test_gradual_warmup_scheduler_importable(self):
+        """Test that GradualWarmupScheduler can be imported."""
+        try:
+            from warmup_scheduler import GradualWarmupScheduler
+            assert GradualWarmupScheduler is not None
+        except ModuleNotFoundError as e:
+            if "torch" in str(e):
+                pytest.skip("PyTorch not installed - this is expected for infrastructure setup")
+            else:
+                raise
+    
+    @pytest.mark.unit
+    def test_unit_marker(self):
+        """Test that unit test marker works."""
+        assert True
+    
+    @pytest.mark.integration
+    def test_integration_marker(self):
+        """Test that integration test marker works."""
+        assert True
+    
+    @pytest.mark.slow
+    def test_slow_marker(self):
+        """Test that slow test 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()
+        
+        test_file = temp_dir / "test.txt"
+        test_file.write_text("Hello, World!")
+        assert test_file.exists()
+        assert test_file.read_text() == "Hello, World!"
+    
+    def test_mock_config_fixture(self, mock_config):
+        """Test that mock_config fixture provides expected attributes."""
+        assert mock_config.warmup_epochs == 5
+        assert mock_config.base_lr == 0.001
+        assert mock_config.warmup_factor == 0.1
+        assert mock_config.total_epochs == 100
+    
+    def test_mock_optimizer_fixture(self, mock_optimizer):
+        """Test that mock_optimizer fixture works correctly."""
+        assert len(mock_optimizer.param_groups) == 2
+        assert mock_optimizer.param_groups[0]['lr'] == 0.001
+        assert mock_optimizer.param_groups[1]['lr'] == 0.01
+    
+    def test_capture_output_fixture(self, capture_output):
+        """Test that capture_output fixture works correctly."""
+        with capture_output as capture:
+            print("Hello stdout")
+            print("Hello stderr", file=sys.stderr)
+        
+        assert "Hello stdout" in capture.get_stdout()
+        assert "Hello stderr" in capture.get_stderr()
+    
+    def test_sample_data_fixture(self, sample_data):
+        """Test that sample_data fixture provides expected data."""
+        assert 'learning_rates' in sample_data
+        assert 'epochs' in sample_data
+        assert len(sample_data['learning_rates']) == 3
+        assert len(sample_data['epochs']) == 100
+    
+    def test_environment_vars_fixture(self, environment_vars):
+        """Test that environment_vars fixture works correctly."""
+        original_value = os.environ.get('TEST_VAR', None)
+        
+        environment_vars(TEST_VAR='test_value')
+        assert os.environ['TEST_VAR'] == 'test_value'
+        
+        # After test, environment should be restored
+        # (this will be checked after the fixture cleanup)
+    
+    def test_coverage_configured(self):
+        """Test that coverage is properly configured."""
+        try:
+            import coverage
+            assert coverage is not None
+        except ImportError:
+            pytest.skip("Coverage not yet installed")
+    
+    def test_test_directories_exist(self):
+        """Test that test directory structure exists."""
+        test_root = Path(__file__).parent
+        assert test_root.exists()
+        assert (test_root / "unit").exists()
+        assert (test_root / "integration").exists()
+        assert (test_root / "__init__.py").exists()
+        assert (test_root / "unit" / "__init__.py").exists()
+        assert (test_root / "integration" / "__init__.py").exists()
+    
+    def test_conftest_loaded(self):
+        """Test that conftest.py is properly loaded."""
+        # If we can use the fixtures, conftest is loaded
+        assert True
+    
+    @pytest.mark.parametrize("value,expected", [
+        (1, 1),
+        (2, 2),
+        (3, 3),
+    ])
+    def test_parametrize_works(self, value, expected):
+        """Test that pytest parametrize decorator works."""
+        assert value == 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