init: new structure + fix lint errors

tests/conftest.py

@@ -0,0 +1,44 @@
+"""
+Shared test fixtures and configuration.
+"""
+
+from __future__ import annotations
+
+import pytest  # type: ignore[import-not-found]
+from fastapi.testclient import TestClient
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+
+from cpv3.db.base import Base
+from cpv3.main import app
+
+
+# Use in-memory SQLite for tests (or configure a test database)
+TEST_DATABASE_URL = "sqlite+aiosqlite:///:memory:"
+
+
+@pytest.fixture
+def test_client():
+    """Create a test client for the FastAPI app."""
+    with TestClient(app) as client:
+        yield client
+
+
+@pytest.fixture
+async def test_db_session():
+    """Create a test database session."""
+    engine = create_async_engine(TEST_DATABASE_URL, echo=False)
+
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+    async_session = async_sessionmaker(
+        bind=engine, class_=AsyncSession, expire_on_commit=False
+    )
+
+    async with async_session() as session:
+        yield session
+
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.drop_all)
+
+    await engine.dispose()