code: def test_constant(self):
      gateway = get_gateway()
      JCheckpointConfig = (
          gateway.jvm.org.apache.flink.streaming.api.environment.CheckpointConfig
      )
  
      self.assertEqual(
          CheckpointConfig.DEFAULT_MAX_CONCURRENT_CHECKPOINTS,
          JCheckpointConfig.DEFAULT_MAX_CONCURRENT_CHECKPOINTS,
      )
  
      self.assertEqual(
          CheckpointConfig.DEFAULT_MIN_PAUSE_BETWEEN_CHECKPOINTS,
          JCheckpointConfig.DEFAULT_MIN_PAUSE_BETWEEN_CHECKPOINTS,
      )
  
      self.assertEqual(
          CheckpointConfig.DEFAULT_TIMEOUT,
          JCheckpointConfig.DEFAULT_TIMEOUT,
      )
  
      self.assertEqual(
          CheckpointConfig.DEFAULT_MODE,
          CheckpointingMode._from_j_checkpointing_mode(
              JCheckpointConfig.DEFAULT_MODE
          ),
      )
  
file_path: flink/flink-python/pyflink/datastream/tests/test_check_point_config.py
imports: from pyflink.common import Duration
  from pyflink.datastream import CheckpointConfig, CheckpointingMode, ExternalizedCheckpointCleanup, StreamExecutionEnvironment
  from pyflink.java_gateway import get_gateway
  from pyflink.testing.test_case_utils import PyFlinkTestCase
label_desc: Use image node_id 2 for calling the CheckpointConfigTests obj's underlying member method code with example usage: obj.test_constant() without return types