code: def test_retry(self):
      client = SparkConnectClient("sc://foo/;token=bar")
  
      total_sleep = 0
  
      def sleep(t):
          nonlocal total_sleep
          total_sleep += t
  
      try:
          for attempt in Retrying(client._retry_policies, sleep=sleep):
              with attempt:
                  raise TestException(
                      "Retryable error", grpc.StatusCode.UNAVAILABLE
                  )
      except RetriesExceeded:
          pass
  
      # tolerated at least 10 mins of fails
      self.assertGreaterEqual(total_sleep, 600)
  
imports: import unittest
  import uuid
  from collections.abc import Generator
  from typing import Optional, Any
  from pyspark.testing.connectutils import should_test_connect, connect_requirement_message
  from pyspark.testing.utils import eventually
label_desc: Use image node_id 7 for calling the SparkConnectClientTestCase obj's underlying member method code with example usage: obj.test_retry() without return types