code: def test_connect_kwargs_from_conn(self):
      extra = json.dumps(
          dict(
              connect_kwargs={
                  "attrs_before": {
                      1: 2,
                      pyodbc.SQL_TXN_ISOLATION: pyodbc.SQL_TXN_READ_UNCOMMITTED,
                  },
                  "readonly": True,
                  "autocommit": True,
              }
          )
      )
  
      hook = self.get_hook(conn_params=dict(extra=extra))
      assert hook.connect_kwargs == {
          "attrs_before": {
              1: 2,
              pyodbc.SQL_TXN_ISOLATION: pyodbc.SQL_TXN_READ_UNCOMMITTED,
          },
          "readonly": True,
          "autocommit": True,
      }
  
imports: from __future__ import annotations
  import json
  import logging
  from dataclasses import dataclass
  from unittest import mock
  from unittest.mock import patch
  from urllib.parse import quote_plus, urlsplit
  import pyodbc
  import pytest
  from airflow.models import Connection
  from airflow.providers.odbc.hooks.odbc import OdbcHook
label_desc: Use image node_id 8 for calling the TestOdbcHook obj's underlying member method code with example usage: obj.test_connect_kwargs_from_conn() without return types