code: def test_cluster_properties():
      cl = h2o.cluster()
      assert len(cl._schema_attrs_) == 24
      for k in cl._schema_attrs_.keys():
          assert getattr(cl, k) is not None
  
imports: import sys
  import h2o
  from tests import pyunit_utils
label_desc: Use image node_id 2 for calling a global function with example usage: test_cluster_properties() without return types