diff --git a/.gitignore b/.gitignore
index a47fb1d..36cab1d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,64 @@
+# IDE files
 .idea
-__pycache__
\ No newline at end of file
+.vscode/
+*.swp
+*.swo
+*~
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Virtual environments
+venv/
+.venv/
+ENV/
+env/
+virtualenv/
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+coverage.xml
+*.cover
+.hypothesis/
+.tox/
+.nox/
+
+# Claude
+.claude/*
+
+# Project specific
+*/queue.txt
+*/crawled.txt
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+
+# Package manager
+# Note: Do not ignore poetry.lock or uv.lock
+pip-log.txt
+pip-delete-this-directory.txt
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..aae71f4
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,282 @@
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+    {file = "pluggy-1.5.0-py3-none-any.whl", hash = "sha256:44e1ad92c8ca002de6377e165f3e0f1be63266ab4d554740532335b9d75ea669"},
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+]
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+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 = "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"},
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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"]
+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 = "96176c9214534068f3ea7c00be51c23e9d99a8b4862eed2791d0a0cb449ad1e0"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..f88ac85
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,89 @@
+[tool.poetry]
+name = "website-crawler"
+version = "0.1.0"
+description = "A multi-threaded web crawler for gathering links"
+authors = ["Your Name <your.email@example.com>"]
+readme = "README.md"
+packages = []
+
+[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"
+tests = "pytest"
+
+[tool.pytest.ini_options]
+minversion = "8.0"
+testpaths = ["tests"]
+python_files = ["test_*.py", "*_test.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = [
+    "--strict-markers",
+    "--strict-config",
+    "--verbose",
+    "--cov=.",
+    "--cov-branch",
+    "--cov-report=term-missing:skip-covered",
+    "--cov-report=html:htmlcov",
+    "--cov-report=xml:coverage.xml",
+    "--cov-fail-under=80",
+]
+markers = [
+    "unit: Unit tests",
+    "integration: Integration tests",
+    "slow: Slow tests",
+]
+filterwarnings = [
+    "error",
+    "ignore::UserWarning",
+    "ignore::DeprecationWarning",
+]
+
+[tool.coverage.run]
+source = ["."]
+omit = [
+    "*/tests/*",
+    "*/test_*",
+    "*/__pycache__/*",
+    "*/venv/*",
+    "*/.venv/*",
+    "*/virtualenv/*",
+    "*/setup.py",
+    "*/conftest.py",
+    "*/.pytest_cache/*",
+    "*/htmlcov/*",
+]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "def __repr__",
+    "def __str__",
+    "raise AssertionError",
+    "raise NotImplementedError",
+    "if __name__ == .__main__.:",
+    "if TYPE_CHECKING:",
+    "class .*\\bProtocol\\):",
+    "@(abc\\.)?abstractmethod",
+]
+precision = 2
+show_missing = true
+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..9881ef1
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,176 @@
+"""Shared pytest fixtures and configuration for all tests."""
+
+import os
+import shutil
+import tempfile
+from pathlib import Path
+from typing import Generator, Dict, Any
+from unittest.mock import Mock, MagicMock
+
+import pytest
+
+
+@pytest.fixture
+def temp_dir() -> Generator[Path, None, None]:
+    """Create a temporary directory for test usage.
+    
+    Yields:
+        Path: Path to the temporary directory that will be cleaned up after the test.
+    """
+    temp_path = Path(tempfile.mkdtemp())
+    try:
+        yield temp_path
+    finally:
+        if temp_path.exists():
+            shutil.rmtree(temp_path)
+
+
+@pytest.fixture
+def mock_config() -> Dict[str, Any]:
+    """Provide a mock configuration dictionary for testing.
+    
+    Returns:
+        Dict[str, Any]: A dictionary with common configuration values.
+    """
+    return {
+        "project_name": "test_project",
+        "home_page": "https://example.com",
+        "domain_name": "example.com",
+        "number_of_threads": 4,
+        "queue_file": "queue.txt",
+        "crawled_file": "crawled.txt",
+    }
+
+
+@pytest.fixture
+def mock_queue() -> Mock:
+    """Create a mock Queue object for testing threading components.
+    
+    Returns:
+        Mock: A mock Queue object with common queue methods.
+    """
+    mock_q = Mock()
+    mock_q.empty.return_value = False
+    mock_q.get.return_value = "https://example.com/test"
+    mock_q.put = Mock()
+    mock_q.task_done = Mock()
+    return mock_q
+
+
+@pytest.fixture
+def sample_html() -> str:
+    """Provide sample HTML content for testing link parsing.
+    
+    Returns:
+        str: Sample HTML content with various types of links.
+    """
+    return """
+    <!DOCTYPE html>
+    <html>
+    <head>
+        <title>Test Page</title>
+    </head>
+    <body>
+        <a href="https://example.com/page1">External Link</a>
+        <a href="/page2">Relative Link</a>
+        <a href="page3.html">Simple Link</a>
+        <a href="mailto:test@example.com">Email Link</a>
+        <a href="#section">Anchor Link</a>
+        <a href="https://other-domain.com">Other Domain</a>
+    </body>
+    </html>
+    """
+
+
+@pytest.fixture
+def test_files(temp_dir: Path) -> Dict[str, Path]:
+    """Create test files in the temporary directory.
+    
+    Args:
+        temp_dir: The temporary directory fixture.
+        
+    Returns:
+        Dict[str, Path]: Dictionary mapping file names to their paths.
+    """
+    files = {}
+    
+    # Create queue.txt
+    queue_file = temp_dir / "queue.txt"
+    queue_file.write_text("https://example.com/page1\nhttps://example.com/page2\n")
+    files["queue"] = queue_file
+    
+    # Create crawled.txt
+    crawled_file = temp_dir / "crawled.txt"
+    crawled_file.write_text("https://example.com\n")
+    files["crawled"] = crawled_file
+    
+    return files
+
+
+@pytest.fixture
+def mock_spider_class() -> type:
+    """Create a mock Spider class for testing.
+    
+    Returns:
+        type: A mock Spider class with basic methods.
+    """
+    class MockSpider:
+        def __init__(self, thread_id, domain_name, boot_url):
+            self.thread_id = thread_id
+            self.domain_name = domain_name
+            self.boot_url = boot_url
+            
+        self.crawl_page = Mock()
+        self.gather_links = Mock(return_value={"https://example.com/new"})
+        self.add_links_to_queue = Mock()
+        self.update_files = Mock()
+        
+    return MockSpider
+
+
+@pytest.fixture(autouse=True)
+def reset_singletons():
+    """Reset any singleton instances between tests.
+    
+    This fixture runs automatically before each test to ensure
+    clean state for singleton patterns.
+    """
+    # Add any singleton reset logic here if needed
+    yield
+    # Cleanup after test if needed
+
+
+@pytest.fixture
+def mock_url_response():
+    """Mock URL response for testing web crawling functionality.
+    
+    Returns:
+        Mock: A mock response object with common HTTP response attributes.
+    """
+    mock_response = Mock()
+    mock_response.status_code = 200
+    mock_response.text = "<html><body><a href='/test'>Test Link</a></body></html>"
+    mock_response.headers = {"Content-Type": "text/html"}
+    mock_response.url = "https://example.com"
+    return mock_response
+
+
+@pytest.fixture
+def capture_logs():
+    """Capture log output during tests.
+    
+    Yields:
+        list: A list that will contain all log records during the test.
+    """
+    import logging
+    
+    log_records = []
+    handler = logging.Handler()
+    handler.emit = lambda record: log_records.append(record)
+    
+    root_logger = logging.getLogger()
+    root_logger.addHandler(handler)
+    
+    yield log_records
+    
+    root_logger.removeHandler(handler)
\ 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..0ae7298
--- /dev/null
+++ b/tests/test_setup_validation.py
@@ -0,0 +1,137 @@
+"""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 infrastructure setup."""
+    
+    def test_python_version(self):
+        """Verify Python version is 3.8 or higher."""
+        assert sys.version_info >= (3, 8), "Python 3.8 or higher is required"
+    
+    def test_pytest_is_importable(self):
+        """Verify pytest can be imported."""
+        import pytest
+        assert pytest is not None
+    
+    def test_pytest_cov_is_importable(self):
+        """Verify pytest-cov can be imported."""
+        import pytest_cov
+        assert pytest_cov is not None
+    
+    def test_pytest_mock_is_importable(self):
+        """Verify pytest-mock can be imported."""
+        import pytest_mock
+        assert pytest_mock is not None
+    
+    def test_project_structure_exists(self):
+        """Verify the basic project structure exists."""
+        workspace = Path(__file__).parent.parent
+        
+        # Check main Python files exist
+        assert (workspace / "main.py").exists(), "main.py not found"
+        assert (workspace / "spider.py").exists(), "spider.py not found"
+        assert (workspace / "domain.py").exists(), "domain.py not found"
+        assert (workspace / "general.py").exists(), "general.py not found"
+        assert (workspace / "link_finder.py").exists(), "link_finder.py not found"
+    
+    def test_test_directories_exist(self):
+        """Verify test directory structure is created."""
+        tests_dir = Path(__file__).parent
+        
+        assert tests_dir.exists(), "tests directory not found"
+        assert (tests_dir / "__init__.py").exists(), "tests/__init__.py not found"
+        assert (tests_dir / "unit").exists(), "tests/unit directory not found"
+        assert (tests_dir / "unit" / "__init__.py").exists(), "tests/unit/__init__.py not found"
+        assert (tests_dir / "integration").exists(), "tests/integration directory not found"
+        assert (tests_dir / "integration" / "__init__.py").exists(), "tests/integration/__init__.py not found"
+    
+    def test_conftest_exists_and_has_fixtures(self):
+        """Verify conftest.py exists and fixtures are available."""
+        conftest_path = Path(__file__).parent / "conftest.py"
+        assert conftest_path.exists(), "conftest.py not found"
+        
+        # Test that fixtures are available (this will fail if they're not properly defined)
+        # The fixtures are injected by pytest, so their existence proves they work
+        
+    def test_pyproject_toml_exists(self):
+        """Verify pyproject.toml exists with proper configuration."""
+        pyproject_path = Path(__file__).parent.parent / "pyproject.toml"
+        assert pyproject_path.exists(), "pyproject.toml not found"
+        
+        # Read and verify basic content
+        content = pyproject_path.read_text()
+        assert "[tool.poetry]" in content, "Poetry configuration not found"
+        assert "[tool.pytest.ini_options]" in content, "Pytest configuration not found"
+        assert "[tool.coverage.run]" in content, "Coverage configuration not found"
+    
+    @pytest.mark.unit
+    def test_unit_marker_works(self):
+        """Test that the unit test marker is properly configured."""
+        assert True, "Unit marker test passed"
+    
+    @pytest.mark.integration
+    def test_integration_marker_works(self):
+        """Test that the integration test marker is properly configured."""
+        assert True, "Integration marker test passed"
+    
+    @pytest.mark.slow
+    def test_slow_marker_works(self):
+        """Test that the slow test marker is properly configured."""
+        assert True, "Slow marker test passed"
+    
+    def test_fixtures_are_callable(self, temp_dir, mock_config, mock_queue, sample_html):
+        """Test that custom fixtures from conftest.py work correctly."""
+        # Test temp_dir fixture
+        assert temp_dir.exists(), "temp_dir fixture should create a directory"
+        assert temp_dir.is_dir(), "temp_dir should be a directory"
+        
+        # Test mock_config fixture
+        assert isinstance(mock_config, dict), "mock_config should return a dictionary"
+        assert "project_name" in mock_config, "mock_config should have project_name"
+        assert mock_config["project_name"] == "test_project"
+        
+        # Test mock_queue fixture
+        assert hasattr(mock_queue, "empty"), "mock_queue should have empty method"
+        assert hasattr(mock_queue, "get"), "mock_queue should have get method"
+        assert hasattr(mock_queue, "put"), "mock_queue should have put method"
+        
+        # Test sample_html fixture
+        assert isinstance(sample_html, str), "sample_html should return a string"
+        assert "<html>" in sample_html, "sample_html should contain HTML"
+        assert "href=" in sample_html, "sample_html should contain links"
+    
+    def test_test_files_fixture(self, test_files):
+        """Test that the test_files fixture creates files correctly."""
+        assert "queue" in test_files, "test_files should have queue file"
+        assert "crawled" in test_files, "test_files should have crawled file"
+        
+        assert test_files["queue"].exists(), "queue.txt should be created"
+        assert test_files["crawled"].exists(), "crawled.txt should be created"
+        
+        # Verify content
+        queue_content = test_files["queue"].read_text()
+        assert "https://example.com/page1" in queue_content
+        
+        crawled_content = test_files["crawled"].read_text()
+        assert "https://example.com" in crawled_content
+
+
+def test_coverage_threshold_configuration():
+    """Verify coverage threshold is properly set to 80%."""
+    from pathlib import Path
+    
+    pyproject_path = Path(__file__).parent.parent / "pyproject.toml"
+    content = pyproject_path.read_text()
+    
+    # Check both pytest and coverage configurations have 80% threshold
+    assert "--cov-fail-under=80" in content, "Coverage threshold not set to 80% in pytest config"
+    assert "fail_under = 80" in content, "Coverage threshold not set to 80% in coverage config"
+
+
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])
\ 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