feat: implement blog project with CI pipeline

tests/unit/conftest.py

@@ -0,0 +1,18 @@
+# Unit test fixtures
+# Provides: mocks, stubs, isolated test data
+
+from unittest.mock import AsyncMock, Mock
+
+import pytest
+
+
+@pytest.fixture
+def mock_service() -> Mock:
+    """Create a mock service for unit testing."""
+    return Mock()
+
+
+@pytest.fixture
+def mock_async_service() -> AsyncMock:
+    """Create an async mock service for unit testing."""
+    return AsyncMock()