code: def test_deserialize_required_fields(self):
      connection_dump_1 = {
          "connection_id": "mysql_default_2",
      }
      with pytest.raises(
          marshmallow.exceptions.ValidationError,
          match=re.escape(
              "{'conn_type': ['Missing data for required field.']}"
          ),
      ):
          connection_collection_item_schema.load(connection_dump_1)
  
imports: from __future__ import annotations
  import re
  import marshmallow
  import pytest
  from airflow.api_connexion.schemas.connection_schema import ConnectionCollection, connection_collection_item_schema, connection_collection_schema, connection_schema, connection_test_schema
  from airflow.models import Connection
  from airflow.utils.session import create_session, provide_session
  from tests.test_utils.db import clear_db_connections
label_desc: Use image node_id 5 for calling the TestConnectionCollectionItemSchema obj's underlying member method code with example usage: obj.test_deserialize_required_fields() without return types