diff --git a/.gitignore b/.gitignore
index 0cd930f..8b41876 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,37 @@
-# python cache files
+# Python cache files
 .mypy_cache/
 .pytest_cache/
 .venv/
 __pycache__/
 *.pyc
+
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+htmlcov/
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+
+# Claude
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+
+# Build artifacts
+dist/
+build/
+*.egg-info/
+*.egg
+
+# Virtual environments
+venv/
+env/
+ENV/
+virtualenv/
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..3897768
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,282 @@
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+
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+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 = "5.0.0"
+description = "Pytest plugin for measuring coverage."
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+files = [
+    {file = "pytest-cov-5.0.0.tar.gz", hash = "sha256:5837b58e9f6ebd335b0f8060eecce69b662415b16dc503883a02f45dfeb14857"},
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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", "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 = "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-musllinux_1_2_x86_64.whl", hash = "sha256:a198f10c4d1b1375d7687bc25294306e551bf1abfa4eace6650070a5c1ae2744"},
+    {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 = "7a36c1a4ffb4d0547ac1970681cad500de03e6ed6ae1a3f71caf37391a59cb2c"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..745a888
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,88 @@
+[tool.poetry]
+name = "ansi-color-build"
+version = "0.1.0"
+description = "ANSI color build output plugin for Sublime Text"
+authors = ["Your Name <you@example.com>"]
+readme = "README.md"
+packages = [{include = "*.py"}]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^8.3.3"
+pytest-cov = "^5.0.0"
+pytest-mock = "^3.14.0"
+
+[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",
+    "--verbose",
+    "--cov=.",
+    "--cov-report=term-missing",
+    "--cov-report=html",
+    "--cov-report=xml",
+    "--cov-fail-under=80",
+]
+markers = [
+    "unit: Unit tests",
+    "integration: Integration tests",
+    "slow: Slow running tests",
+]
+filterwarnings = [
+    "error",
+    "ignore::UserWarning",
+    "ignore::DeprecationWarning",
+]
+
+[tool.coverage.run]
+source = ["."]
+omit = [
+    "*/tests/*",
+    "*/__pycache__/*",
+    "*/venv/*",
+    "*/virtualenv/*",
+    "*/.venv/*",
+    "*/dist/*",
+    "*/build/*",
+    "*.egg-info/*",
+    "setup.py",
+    "conftest.py",
+    "test_*.py",
+    "*_test.py",
+]
+
+[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",
+]
+precision = 2
+show_missing = true
+skip_covered = false
+
+[tool.coverage.html]
+directory = "htmlcov"
+
+[tool.coverage.xml]
+output = "coverage.xml"
\ 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..b3a6788
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,220 @@
+"""Shared pytest fixtures and configuration for all tests."""
+
+import os
+import sys
+import tempfile
+from pathlib import Path
+from typing import Generator
+from unittest.mock import MagicMock
+
+import pytest
+
+
+@pytest.fixture
+def temp_dir() -> Generator[Path, None, None]:
+    """Provide a temporary directory that is automatically cleaned up."""
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        yield Path(tmp_dir)
+
+
+@pytest.fixture
+def temp_file(temp_dir: Path) -> Generator[Path, None, None]:
+    """Provide a temporary file path in the temp directory."""
+    temp_path = temp_dir / "test_file.txt"
+    temp_path.touch()
+    yield temp_path
+
+
+@pytest.fixture
+def mock_sublime():
+    """Mock the sublime module for testing Sublime Text plugins."""
+    sublime = MagicMock()
+    sublime.HOVER_TEXT = 1
+    sublime.HOVER_GUTTER = 2
+    sublime.HOVER_MARGIN = 3
+    sublime.ENCODED_POSITION = 1
+    sublime.TRANSIENT = 4
+    sublime.FORCE_GROUP = 8
+    sublime.IGNORECASE = 2
+    sublime.LITERAL = 1
+    sublime.MONOSPACE_FONT = 1
+    sublime.KEEP_OPEN_ON_FOCUS_LOST = 2
+    sublime.HTML = 1
+    sublime.COOPERATE_WITH_AUTO_COMPLETE = 2
+    sublime.HIDE_ON_MOUSE_MOVE = 4
+    sublime.HIDE_ON_MOUSE_MOVE_AWAY = 8
+    sublime.KEEP_ON_SELECTION_MODIFIED = 16
+    sublime.HIDE_ON_CHARACTER_EVENT = 32
+    
+    # Common sublime methods
+    sublime.status_message = MagicMock()
+    sublime.error_message = MagicMock()
+    sublime.message_dialog = MagicMock()
+    sublime.ok_cancel_dialog = MagicMock(return_value=True)
+    sublime.load_settings = MagicMock()
+    sublime.save_settings = MagicMock()
+    sublime.active_window = MagicMock()
+    sublime.windows = MagicMock(return_value=[])
+    sublime.run_command = MagicMock()
+    sublime.set_timeout = MagicMock()
+    sublime.set_timeout_async = MagicMock()
+    
+    return sublime
+
+
+@pytest.fixture
+def mock_sublime_plugin():
+    """Mock the sublime_plugin module for testing Sublime Text plugins."""
+    sublime_plugin = MagicMock()
+    
+    # Base classes
+    class MockTextCommand:
+        def __init__(self, view):
+            self.view = view
+        
+        def run(self, edit, **kwargs):
+            pass
+        
+        def is_enabled(self, **kwargs):
+            return True
+        
+        def is_visible(self, **kwargs):
+            return True
+        
+        def description(self):
+            return None
+    
+    class MockWindowCommand:
+        def __init__(self, window):
+            self.window = window
+        
+        def run(self, **kwargs):
+            pass
+        
+        def is_enabled(self, **kwargs):
+            return True
+        
+        def is_visible(self, **kwargs):
+            return True
+    
+    class MockEventListener:
+        pass
+    
+    sublime_plugin.TextCommand = MockTextCommand
+    sublime_plugin.WindowCommand = MockWindowCommand
+    sublime_plugin.EventListener = MockEventListener
+    
+    return sublime_plugin
+
+
+@pytest.fixture
+def mock_view():
+    """Mock a Sublime Text view object."""
+    view = MagicMock()
+    view.id.return_value = 1
+    view.buffer_id.return_value = 1
+    view.file_name.return_value = "/test/file.py"
+    view.is_dirty.return_value = False
+    view.is_read_only.return_value = False
+    view.is_scratch.return_value = False
+    view.size.return_value = 100
+    view.sel.return_value = []
+    view.settings.return_value = MagicMock()
+    view.window.return_value = MagicMock()
+    
+    return view
+
+
+@pytest.fixture
+def mock_window():
+    """Mock a Sublime Text window object."""
+    window = MagicMock()
+    window.id.return_value = 1
+    window.active_view.return_value = MagicMock()
+    window.views.return_value = []
+    window.num_groups.return_value = 1
+    window.active_group.return_value = 0
+    window.focus_view = MagicMock()
+    window.focus_group = MagicMock()
+    window.run_command = MagicMock()
+    window.new_file = MagicMock()
+    window.open_file = MagicMock()
+    window.find_open_file = MagicMock(return_value=None)
+    window.show_input_panel = MagicMock()
+    window.show_quick_panel = MagicMock()
+    window.create_output_panel = MagicMock()
+    window.destroy_output_panel = MagicMock()
+    window.status_message = MagicMock()
+    
+    return window
+
+
+@pytest.fixture
+def mock_settings():
+    """Mock Sublime Text settings object."""
+    settings = MagicMock()
+    settings_dict = {}
+    
+    def get(key, default=None):
+        return settings_dict.get(key, default)
+    
+    def set(key, value):
+        settings_dict[key] = value
+    
+    def has(key):
+        return key in settings_dict
+    
+    def erase(key):
+        settings_dict.pop(key, None)
+    
+    settings.get = get
+    settings.set = set
+    settings.has = has
+    settings.erase = erase
+    
+    return settings
+
+
+@pytest.fixture
+def sample_ansi_output():
+    """Sample ANSI colored output for testing."""
+    return {
+        "simple": "Hello \x1b[31mWorld\x1b[0m!",
+        "multiple_colors": "\x1b[32mGreen\x1b[0m \x1b[33mYellow\x1b[0m \x1b[34mBlue\x1b[0m",
+        "bold": "\x1b[1mBold Text\x1b[0m",
+        "underline": "\x1b[4mUnderlined Text\x1b[0m",
+        "combined": "\x1b[1;31mBold Red\x1b[0m \x1b[4;32mUnderlined Green\x1b[0m",
+        "error": "\x1b[31mError:\x1b[0m File not found",
+        "warning": "\x1b[33mWarning:\x1b[0m Deprecated function",
+        "success": "\x1b[32mSuccess:\x1b[0m All tests passed",
+    }
+
+
+@pytest.fixture(autouse=True)
+def reset_modules(monkeypatch):
+    """Reset module imports between tests to ensure clean state."""
+    # Store original modules
+    original_modules = dict(sys.modules)
+    
+    yield
+    
+    # Remove any modules added during the test
+    modules_to_remove = []
+    for name in sys.modules:
+        if name not in original_modules:
+            modules_to_remove.append(name)
+    
+    for name in modules_to_remove:
+        del sys.modules[name]
+
+
+@pytest.fixture
+def capture_stdout(monkeypatch):
+    """Capture stdout for testing print statements."""
+    import io
+    import sys
+    
+    captured = io.StringIO()
+    monkeypatch.setattr(sys, 'stdout', captured)
+    
+    return captured
\ 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..81ef72e
--- /dev/null
+++ b/tests/test_setup_validation.py
@@ -0,0 +1,134 @@
+"""Validation tests to ensure the testing infrastructure is properly configured."""
+
+import sys
+from pathlib import Path
+
+import pytest
+
+
+class TestSetupValidation:
+    """Test class to validate the testing setup."""
+    
+    def test_pytest_is_installed(self):
+        """Verify pytest is available."""
+        assert "pytest" in sys.modules
+    
+    def test_project_structure_exists(self):
+        """Verify the expected project structure is in place."""
+        project_root = Path(__file__).parent.parent
+        
+        # Check main directories exist
+        assert project_root.exists()
+        assert (project_root / "tests").exists()
+        assert (project_root / "tests" / "unit").exists()
+        assert (project_root / "tests" / "integration").exists()
+        
+        # Check configuration files exist
+        assert (project_root / "pyproject.toml").exists()
+        assert (project_root / ".gitignore").exists()
+        
+        # Check __init__.py files exist
+        assert (project_root / "tests" / "__init__.py").exists()
+        assert (project_root / "tests" / "unit" / "__init__.py").exists()
+        assert (project_root / "tests" / "integration" / "__init__.py").exists()
+    
+    def test_conftest_fixtures_available(self, temp_dir, mock_sublime, mock_view):
+        """Verify conftest fixtures are accessible."""
+        # Test temp_dir fixture
+        assert temp_dir.exists()
+        assert temp_dir.is_dir()
+        
+        # Test mock_sublime fixture
+        assert hasattr(mock_sublime, 'status_message')
+        assert hasattr(mock_sublime, 'error_message')
+        
+        # Test mock_view fixture
+        assert hasattr(mock_view, 'file_name')
+        assert mock_view.file_name() == "/test/file.py"
+    
+    @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_coverage_is_configured(self):
+        """Verify coverage is properly configured."""
+        # This test will pass if coverage is running
+        # The actual verification happens through the coverage report
+        assert True
+    
+    def test_sample_ansi_fixture(self, sample_ansi_output):
+        """Test the sample ANSI output fixture."""
+        assert "simple" in sample_ansi_output
+        assert "\x1b[31m" in sample_ansi_output["simple"]  # Red color code
+        assert "\x1b[32m" in sample_ansi_output["success"]  # Green color code
+        assert "\x1b[33m" in sample_ansi_output["warning"]  # Yellow color code
+
+
+class TestMockingCapabilities:
+    """Test mocking capabilities for Sublime Text components."""
+    
+    def test_sublime_module_mocking(self, mock_sublime):
+        """Test that sublime module can be properly mocked."""
+        # Test constants
+        assert mock_sublime.HOVER_TEXT == 1
+        assert mock_sublime.ENCODED_POSITION == 1
+        
+        # Test method calls
+        mock_sublime.status_message("Test message")
+        mock_sublime.status_message.assert_called_once_with("Test message")
+        
+        # Test return values
+        assert mock_sublime.ok_cancel_dialog("Test?") is True
+    
+    def test_view_mocking(self, mock_view):
+        """Test that view objects can be properly mocked."""
+        # Test properties
+        assert mock_view.id() == 1
+        assert mock_view.file_name() == "/test/file.py"
+        assert mock_view.is_dirty() is False
+        
+        # Test that methods can be called
+        mock_view.size()
+        mock_view.sel()
+    
+    def test_window_mocking(self, mock_window):
+        """Test that window objects can be properly mocked."""
+        # Test properties
+        assert mock_window.id() == 1
+        assert mock_window.num_groups() == 1
+        
+        # Test method calls
+        mock_window.run_command("test_command")
+        mock_window.run_command.assert_called_once_with("test_command")
+    
+    def test_settings_mocking(self, mock_settings):
+        """Test that settings objects can be properly mocked."""
+        # Test get/set
+        mock_settings.set("test_key", "test_value")
+        assert mock_settings.get("test_key") == "test_value"
+        
+        # Test has
+        assert mock_settings.has("test_key") is True
+        assert mock_settings.has("nonexistent_key") is False
+        
+        # Test erase
+        mock_settings.erase("test_key")
+        assert mock_settings.get("test_key") is None
+
+
+def test_basic_assertion():
+    """A simple test to ensure pytest is working."""
+    assert 1 + 1 == 2
+    assert "hello".upper() == "HELLO"
+    assert [1, 2, 3][::-1] == [3, 2, 1]
\ 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