code: def test_equals_and_hash(self):
      config1 = (
          StreamExecutionEnvironment.get_execution_environment().get_config()
      )
  
      config2 = (
          StreamExecutionEnvironment.get_execution_environment().get_config()
      )
  
      self.assertEqual(config1, config2)
  
      self.assertEqual(hash(config1), hash(config2))
  
      config1.set_parallelism(12)
      config2.set_parallelism(11)
  
      self.assertNotEqual(config1, config2)
  
      # it is allowed for hashes to be equal even if objects are not
  
      config2.set_parallelism(12)
  
      self.assertEqual(config1, config2)
  
      self.assertEqual(hash(config1), hash(config2))
  
imports: from pyflink.datastream import StreamExecutionEnvironment
  from pyflink.common import ExecutionConfig, RestartStrategies, ExecutionMode, Configuration
  from pyflink.java_gateway import get_gateway
  from pyflink.testing.test_case_utils import PyFlinkTestCase
  from pyflink.util.java_utils import get_j_env_configuration
label_desc: Use image node_id 23 for calling the ExecutionConfigTests obj's underlying member method code with example usage: obj.test_equals_and_hash() without return types