fix existing tests

Author: vgvoleg

tests/aio/query/test_query_session_pool.py

@@ -10,15 +10,14 @@ async def test_checkout_provides_created_session(self, pool: QuerySessionPoolAsy
         async with pool.checkout() as session:
             assert session._state._state == QuerySessionStateEnum.CREATED
 
-        assert session._state._state == QuerySessionStateEnum.CLOSED
-
     @pytest.mark.asyncio
     async def test_oneshot_query_normal(self, pool: QuerySessionPoolAsync):
         res = await pool.execute_with_retries("select 1;")
         assert len(res) == 1
 
     @pytest.mark.asyncio
     async def test_oneshot_ddl_query(self, pool: QuerySessionPoolAsync):
+        await pool.execute_with_retries("drop table if exists Queen;")
         await pool.execute_with_retries("create table Queen(key UInt64, PRIMARY KEY (key));")
         await pool.execute_with_retries("drop table Queen;")