code: def _test() -> None:
      import sys
      import doctest
      from pyspark.sql import SparkSession as PySparkSession
      import pyspark.sql.connect.conf
  
      globs = pyspark.sql.connect.conf.__dict__.copy()
      globs["spark"] = (
          PySparkSession.builder.appName("sql.connect.conf tests")
          .remote("local[4]")
          .getOrCreate()
      )
  
      (failure_count, test_count) = doctest.testmod(
          pyspark.sql.connect.conf,
          globs=globs,
          optionflags=doctest.ELLIPSIS
          | doctest.NORMALIZE_WHITESPACE
          | doctest.IGNORE_EXCEPTION_DETAIL,
      )
  
      globs["spark"].stop()
  
      if failure_count:
          sys.exit(-1)
  
file_path: spark/python/pyspark/sql/connect/conf.py
imports: from pyspark.errors import PySparkValueError, PySparkTypeError
  from pyspark.sql.connect.utils import check_dependencies
  from typing import Any, Optional, Union, cast
  import warnings
  from pyspark import _NoValue
  from pyspark._globals import _NoValueType
  from pyspark.sql.conf import RuntimeConfig
  from pyspark.sql.connect import proto
  from pyspark.sql.connect.client import SparkConnectClient
label_desc: Use image node_id 1 for calling a global function with example usage: _test() without return types