init unit tests

tests/conftest.py

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+import pytest
+from httpx import AsyncClient
+
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.ext.asyncio import create_async_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.exc import SQLAlchemyError
+
+from the_app.main import app
+from the_app import config
+from the_app.database import get_db, engine
+from the_app.models.base import Base
+
+global_settings = config.get_settings()
+url = global_settings.asyncpg_test_url
+engine = create_async_engine(url)
+
+async_session = sessionmaker(engine, expire_on_commit=False, class_=AsyncSession)
+
+
+async def get_test_db():
+    session = async_session()
+    try:
+        yield session
+        await session.commit()
+    except SQLAlchemyError as ex:
+        await session.rollback()
+        raise ex
+    finally:
+        await session.close()
+
+app.dependency_overrides[get_db] = get_test_db
+
+
+async def start_db():
+    async with engine.begin() as conn:
+        await conn.run_sync(Base.metadata.drop_all)
+        await conn.run_sync(Base.metadata.create_all)
+
+
+@pytest.fixture
+async def client() -> AsyncClient:
+    async with AsyncClient(
+        app=app,
+        base_url="http://testserver",
+        headers={"Content-Type": "application/json"},
+    ) as client:
+        await start_db()
+        yield client