code: def test_get_set_options(self):
      state_backend = RocksDBStateBackend("file://var/checkpoints/")
  
      self.assertIsNone(state_backend.get_options())
  
      state_backend.set_options(
          "org.apache.flink.contrib.streaming.state.DefaultConfigurableOptionsFactory"
      )
  
      self.assertEqual(
          state_backend.get_options(),
          "org.apache.flink.contrib.streaming.state."
          "DefaultConfigurableOptionsFactory",
      )
  
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 5 for calling the RocksDBStateBackendTests obj's underlying member method code with example usage: obj.test_get_set_options() without return types