V5.1 Update tests and documentation

tests/test_db.py

@@ -6,7 +6,6 @@ import pytest
 import pytest_asyncio
 import sqlalchemy as sa
 from sqlalchemy import inspect
-from sqlalchemy import text
 from sqlalchemy.dialects import postgresql
 from sqlalchemy.exc import SAWarning
 from sqlmodel import SQLModel
@@ -77,7 +76,9 @@ async def test_get_session_yields_async_session(tmp_path):
 
     try:
         async with session_scope(settings=settings) as session:
-            assert session is not None
+            assert isinstance(session, AsyncSession)
+            value = (await session.exec(select(1))).one()
+            assert value == 1
     finally:
         await dispose_database_runtime()