code: def test_constant(self):
      gateway = get_gateway()
      JMemoryStateBackend = (
          gateway.jvm.org.apache.flink.runtime.state.memory.MemoryStateBackend
      )
  
      self.assertEqual(
          MemoryStateBackend.DEFAULT_MAX_STATE_SIZE,
          JMemoryStateBackend.DEFAULT_MAX_STATE_SIZE,
      )
  
imports: from pyflink.datastream.state_backend import _from_j_state_backend, CustomStateBackend, MemoryStateBackend, FsStateBackend, RocksDBStateBackend, PredefinedOptions, EmbeddedRocksDBStateBackend
  from pyflink.java_gateway import get_gateway
  from pyflink.pyflink_gateway_server import on_windows
  from pyflink.testing.test_case_utils import PyFlinkTestCase
  from pyflink.util.java_utils import load_java_class
label_desc: Use image node_id 1 for calling the MemoryStateBackendTests obj's underlying member method code with example usage: obj.test_constant() without return types