feat: Complete PyPI Query MCP Server Implementation (#3)

Merge pull request implementing complete PyPI query MCP server with comprehensive features and CI/CD pipeline.

tests/__init__.py

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+"""Test package for PyPI Query MCP Server."""

tests/conftest.py

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+"""Pytest configuration and fixtures."""
+
+import pytest
+
+
+@pytest.fixture
+def sample_package_data():
+    """Sample package data for testing."""
+    return {
+        "info": {
+            "name": "test-package",
+            "version": "1.0.0",
+            "summary": "A test package",
+            "description": "This is a test package for testing purposes.",
+            "author": "Test Author",
+            "author_email": "test@example.com",
+            "license": "MIT",
+            "requires_python": ">=3.8",
+            "requires_dist": [
+                "requests>=2.25.0",
+                "click>=8.0.0",
+                "pytest>=6.0.0; extra == 'test'"
+            ],
+            "classifiers": [
+                "Development Status :: 4 - Beta",
+                "Intended Audience :: Developers",
+                "License :: OSI Approved :: MIT License",
+                "Programming Language :: Python :: 3",
+                "Programming Language :: Python :: 3.8",
+                "Programming Language :: Python :: 3.9",
+                "Programming Language :: Python :: 3.10",
+                "Programming Language :: Python :: 3.11",
+                "Programming Language :: Python :: Implementation :: CPython"
+            ]
+        },
+        "releases": {
+            "1.0.0": [
+                {
+                    "filename": "test_package-1.0.0-py3-none-any.whl",
+                    "packagetype": "bdist_wheel",
+                    "python_version": "py3"
+                },
+                {
+                    "filename": "test-package-1.0.0.tar.gz",
+                    "packagetype": "sdist",
+                    "python_version": "source"
+                }
+            ],
+            "0.9.0": [
+                {
+                    "filename": "test-package-0.9.0.tar.gz",
+                    "packagetype": "sdist",
+                    "python_version": "source"
+                }
+            ]
+        }
+    }
+
+
+@pytest.fixture
+def mock_pypi_response(sample_package_data):
+    """Mock PyPI API response."""
+    return sample_package_data

tests/test_basic.py

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+"""Basic tests for PyPI Query MCP Server."""
+
+import pytest
+
+from pypi_query_mcp import __version__
+
+
+def test_version():
+    """Test that version is defined."""
+    assert __version__ == "0.1.0"
+
+
+def test_import():
+    """Test that main modules can be imported."""
+    from pypi_query_mcp.core import PyPIClient, VersionCompatibility
+    from pypi_query_mcp.server import app
+    
+    assert PyPIClient is not None
+    assert VersionCompatibility is not None
+    assert app is not None
+
+
+@pytest.mark.asyncio
+async def test_pypi_client_basic():
+    """Test basic PyPI client functionality."""
+    from pypi_query_mcp.core import PyPIClient
+    
+    async with PyPIClient() as client:
+        # Test that client can be created and closed
+        assert client is not None
+        
+        # Test cache clearing
+        client.clear_cache()
+
+
+def test_version_compatibility():
+    """Test version compatibility utility."""
+    from pypi_query_mcp.core import VersionCompatibility
+    
+    compat = VersionCompatibility()
+    
+    # Test requires_python parsing
+    spec = compat.parse_requires_python(">=3.8")
+    assert spec is not None
+    
+    # Test classifier extraction
+    classifiers = [
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: Implementation :: CPython"
+    ]
+    
+    versions = compat.extract_python_versions_from_classifiers(classifiers)
+    assert "3.8" in versions
+    assert "3.9" in versions
+    
+    implementations = compat.extract_python_implementations(classifiers)
+    assert "CPython" in implementations
+
+
+def test_mcp_tools_import():
+    """Test that MCP tools can be imported."""
+    from pypi_query_mcp.tools import (
+        check_python_compatibility,
+        get_compatible_python_versions,
+        query_package_dependencies,
+        query_package_info,
+        query_package_versions,
+        suggest_python_version_for_packages,
+    )
+    
+    # Test that all tools are callable
+    assert callable(query_package_info)
+    assert callable(query_package_versions)
+    assert callable(query_package_dependencies)
+    assert callable(check_python_compatibility)
+    assert callable(get_compatible_python_versions)
+    assert callable(suggest_python_version_for_packages)