test: update tests

Author: matmoncon

tests/core/test_client.py

@@ -618,3 +618,6 @@ async def test_drop_indexes(client: Pyneo4jClient, session: AsyncSession):
 async def test_register_models_dir(client: Pyneo4jClient):
     await client.register_models_dir("tests/fixtures/models")
     assert len(client.models) == 6
+
+    for model in client.models:
+        assert getattr(model, "_client", None) is not None