code: def test_exception_on_unknown_cluster_property():
      cl = h2o.cluster()
      try:
          assert (
              cl.unknown_prop is not None
          ), "should have failed before the assertion"
      except AttributeError as e:
          assert (
              "Unknown attribute `unknown_prop` on object of type `H2OCluster`, this property is not available for this H2O backend"
              in str(e)
          )
  
imports: import sys
  import h2o
  from tests import pyunit_utils
label_desc: Use image node_id 3 for calling a global function with example usage: test_exception_on_unknown_cluster_property() without return types