diff --git a/.gitignore b/.gitignore
index 44e38aa..d30eef0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,6 +42,10 @@ htmlcov/
 nosetests.xml
 coverage.xml
 *,cover
+.pytest_cache/
+
+# Claude settings
+.claude/*
 
 # Translations
 *.mo
@@ -63,3 +67,25 @@ RemoteSystemsTempFiles
 .metadata
 .settings
 *.prefs
+
+# Virtual environments
+venv/
+virtualenv/
+.venv/
+ENV/
+env.bak/
+venv.bak/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Poetry - DO NOT ignore lock file
+# poetry.lock is intentionally not ignored
diff --git a/__init__.py b/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..6552e71
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,296 @@
+# 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
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+groups = ["main", "dev"]
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+]
+
+[[package]]
+name = "coverage"
+version = "7.6.1"
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+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
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+testing = ["pytest", "pytest-benchmark"]
+
+[[package]]
+name = "pytest"
+version = "8.3.5"
+description = "pytest: simple powerful testing with Python"
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+files = [
+    {file = "pytest-8.3.5-py3-none-any.whl", hash = "sha256:c69214aa47deac29fad6c2a4f590b9c4a9fdb16a403176fe154b79c0b4d4d820"},
+    {file = "pytest-8.3.5.tar.gz", hash = "sha256:f4efe70cc14e511565ac476b57c279e12a855b11f48f212af1080ef2263d3845"},
+]
+
+[package.dependencies]
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
+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]]
+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"},
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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 = ["dev"]
+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 = "termcolor"
+version = "2.4.0"
+description = "ANSI color formatting for output in terminal"
+optional = false
+python-versions = ">=3.8"
+groups = ["main"]
+files = [
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+]
+
+[package.extras]
+tests = ["pytest", "pytest-cov"]
+
+[[package]]
+name = "tomli"
+version = "2.2.1"
+description = "A lil' TOML parser"
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+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 = ["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 = "613dac428259fef5dd31eaa7e4142a7f73e059d506f6ab0aa05cbe6830c22bdc"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..8cdecc0
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,94 @@
+[tool.poetry]
+name = "ipgeolocation"
+version = "1.0.0"
+description = "IP Geolocation tool"
+authors = ["Your Name <you@example.com>"]
+readme = "README.md"
+license = "MIT"
+packages = [{include = "core"}]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+termcolor = "^2.4.0"
+colorama = "^0.4.6"
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^8.0.0"
+pytest-cov = "^4.1.0"
+pytest-mock = "^3.12.0"
+
+[tool.poetry.scripts]
+test = "pytest:main"
+tests = "pytest:main"
+
+[tool.pytest.ini_options]
+minversion = "6.0"
+testpaths = ["tests"]
+python_files = ["test_*.py", "*_test.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = [
+    "--strict-markers",
+    "--verbose",
+    "--cov=core",
+    "--cov=ipgeolocation",
+    "--cov-report=html",
+    "--cov-report=xml",
+    "--cov-report=term-missing",
+    "--cov-fail-under=80",
+    "--tb=short",
+    "--maxfail=1",
+    "-ra"
+]
+markers = [
+    "unit: marks tests as unit tests (fast, isolated)",
+    "integration: marks tests as integration tests (may require external resources)",
+    "slow: marks tests as slow (deselect with '-m \"not slow\"')"
+]
+
+[tool.coverage.run]
+source = ["core", "ipgeolocation"]
+omit = [
+    "*/tests/*",
+    "*/__pycache__/*",
+    "*/venv/*",
+    "*/virtualenv/*",
+    "*/.venv/*",
+    "*/site-packages/*",
+    "*/dist-packages/*",
+    "*/node_modules/*",
+    "*/.git/*",
+    "*/.tox/*",
+    "*/.eggs/*",
+    "*/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__.:",
+    "if TYPE_CHECKING:",
+    "class .*\\bProtocol\\):",
+    "@(abc\\.)?abstractmethod"
+]
+show_missing = true
+precision = 2
+skip_covered = false
+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..39dbe7e
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,125 @@
+import pytest
+import tempfile
+import shutil
+from pathlib import Path
+from unittest.mock import Mock, MagicMock
+import json
+
+
+@pytest.fixture
+def temp_dir():
+    """Create a temporary directory for test files."""
+    temp_path = tempfile.mkdtemp()
+    yield Path(temp_path)
+    shutil.rmtree(temp_path)
+
+
+@pytest.fixture
+def temp_file(temp_dir):
+    """Create a temporary file in the temp directory."""
+    def _create_temp_file(filename="test_file.txt", content=""):
+        file_path = temp_dir / filename
+        file_path.write_text(content)
+        return file_path
+    return _create_temp_file
+
+
+@pytest.fixture
+def mock_config():
+    """Mock configuration object."""
+    config = MagicMock()
+    config.api_key = "test_api_key"
+    config.timeout = 30
+    config.max_retries = 3
+    config.base_url = "https://api.example.com"
+    return config
+
+
+@pytest.fixture
+def mock_response():
+    """Mock HTTP response object."""
+    response = Mock()
+    response.status_code = 200
+    response.headers = {"Content-Type": "application/json"}
+    response.json.return_value = {"status": "success", "data": {}}
+    response.text = '{"status": "success", "data": {}}'
+    response.raise_for_status = Mock()
+    return response
+
+
+@pytest.fixture
+def sample_ip_data():
+    """Sample IP geolocation data for testing."""
+    return {
+        "ip": "8.8.8.8",
+        "hostname": "dns.google",
+        "city": "Mountain View",
+        "region": "California",
+        "country": "United States",
+        "loc": "37.4056,-122.0775",
+        "org": "AS15169 Google LLC",
+        "postal": "94043",
+        "timezone": "America/Los_Angeles"
+    }
+
+
+@pytest.fixture
+def mock_logger(mocker):
+    """Mock logger object."""
+    logger = mocker.Mock()
+    logger.debug = mocker.Mock()
+    logger.info = mocker.Mock()
+    logger.warning = mocker.Mock()
+    logger.error = mocker.Mock()
+    logger.critical = mocker.Mock()
+    return logger
+
+
+@pytest.fixture
+def mock_file_operations(mocker):
+    """Mock file operations."""
+    mock_open = mocker.mock_open(read_data="test content")
+    mocker.patch("builtins.open", mock_open)
+    return mock_open
+
+
+@pytest.fixture
+def capture_stdout(monkeypatch):
+    """Capture stdout output."""
+    import io
+    import sys
+    
+    captured_output = io.StringIO()
+    monkeypatch.setattr(sys, 'stdout', captured_output)
+    yield captured_output
+    monkeypatch.undo()
+
+
+@pytest.fixture
+def mock_requests(mocker):
+    """Mock requests library."""
+    mock_requests = mocker.patch("requests.get")
+    mock_response = Mock()
+    mock_response.status_code = 200
+    mock_response.json.return_value = {"status": "ok"}
+    mock_requests.return_value = mock_response
+    return mock_requests
+
+
+@pytest.fixture(autouse=True)
+def reset_singleton_instances():
+    """Reset singleton instances between tests."""
+    yield
+
+
+@pytest.fixture
+def mock_environment(monkeypatch):
+    """Set up mock environment variables."""
+    test_env = {
+        "API_KEY": "test_key",
+        "DEBUG": "true",
+        "LOG_LEVEL": "DEBUG"
+    }
+    for key, value in test_env.items():
+        monkeypatch.setenv(key, value)
+    return test_env
\ 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..856a39d
--- /dev/null
+++ b/tests/test_setup_validation.py
@@ -0,0 +1,82 @@
+import pytest
+import sys
+from pathlib import Path
+
+
+class TestSetupValidation:
+    """Validation tests to ensure the testing infrastructure is properly configured."""
+    
+    def test_pytest_installed(self):
+        """Verify pytest is installed and importable."""
+        import pytest
+        assert pytest.__version__
+    
+    def test_coverage_installed(self):
+        """Verify pytest-cov is installed and importable."""
+        import pytest_cov
+        assert pytest_cov.__version__
+    
+    def test_mock_installed(self):
+        """Verify pytest-mock is installed and importable."""
+        import pytest_mock
+        assert pytest_mock
+    
+    def test_project_structure_exists(self):
+        """Verify the project structure is set up correctly."""
+        project_root = Path(__file__).parent.parent
+        
+        assert project_root.exists()
+        assert (project_root / "core").is_dir()
+        assert (project_root / "tests").is_dir()
+        assert (project_root / "tests" / "unit").is_dir()
+        assert (project_root / "tests" / "integration").is_dir()
+    
+    def test_conftest_fixtures_available(self, temp_dir, mock_config, sample_ip_data):
+        """Verify conftest fixtures are available and working."""
+        assert temp_dir.exists()
+        assert temp_dir.is_dir()
+        
+        assert mock_config.api_key == "test_api_key"
+        assert mock_config.timeout == 30
+        
+        assert sample_ip_data["ip"] == "8.8.8.8"
+        assert sample_ip_data["city"] == "Mountain View"
+    
+    def test_project_importable(self):
+        """Verify the project modules can be imported."""
+        try:
+            import core
+            assert True
+        except ImportError:
+            pytest.fail("Could not import core module")
+    
+    @pytest.mark.unit
+    def test_unit_marker(self):
+        """Verify unit test marker works."""
+        assert True
+    
+    @pytest.mark.integration
+    def test_integration_marker(self):
+        """Verify integration test marker works."""
+        assert True
+    
+    @pytest.mark.slow
+    def test_slow_marker(self):
+        """Verify slow test marker works."""
+        assert True
+    
+    def test_temp_file_fixture(self, temp_file):
+        """Verify temp_file fixture works correctly."""
+        test_file = temp_file("test.txt", "Hello, World!")
+        assert test_file.exists()
+        assert test_file.read_text() == "Hello, World!"
+    
+    def test_mock_logger_fixture(self, mock_logger):
+        """Verify mock_logger fixture works correctly."""
+        mock_logger.info("Test message")
+        mock_logger.info.assert_called_once_with("Test message")
+    
+    def test_mock_response_fixture(self, mock_response):
+        """Verify mock_response fixture works correctly."""
+        assert mock_response.status_code == 200
+        assert mock_response.json()["status"] == "success"
\ 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