code: def test_resolve_spark_submit_env_vars_standalone_client_mode(self):
      # Given
      hook = SparkSubmitHook(
          conn_id="spark_standalone_cluster_client_mode",
          env_vars={"bar": "foo"},
      )
  
      # When
      hook._build_spark_submit_command(self._spark_job_file)
  
      # Then
      assert hook._env == {"bar": "foo"}
  
imports: from __future__ import annotations
  import os
  from io import StringIO
  from unittest.mock import call, patch
  import pytest
  from airflow.exceptions import AirflowException
  from airflow.models import Connection
  from airflow.providers.apache.spark.hooks.spark_submit import SparkSubmitHook
  from airflow.utils import db
label_desc: Use image node_id 23 for calling the TestSparkSubmitHook obj's underlying member method code with example usage: obj.test_resolve_spark_submit_env_vars_standalone_client_mode() without return types