code: def test_deserialize(self):
      den = {
          "connection_id": "mysql_default",
          "conn_type": "mysql",
          "host": "mysql",
          "login": "login",
          "schema": "testschema",
          "port": 80,
          "extra": "{'key':'string'}",
      }
      result = connection_schema.load(den)
      assert result == {
          "conn_id": "mysql_default",
          "conn_type": "mysql",
          "host": "mysql",
          "login": "login",
          "schema": "testschema",
          "port": 80,
          "extra": "{'key':'string'}",
      }
  
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 4 for calling the TestConnectionSchema obj's underlying member method code with example usage: obj.test_deserialize() without return types