code: def test_string_representations_of_constant_object():
      sd = _disp_constant
      assert (
          repr(sd)
          == str(sd)
          == sd.to_str()
          == sd.to_pretty_str()
          == sd.to_html()
          == "never changes"
      )
  
imports: import sys
  from h2o.display import H2ODisplay, H2ODisplayWrapper, H2OStringDisplay, H2OItemsDisplay
  from tests import pyunit_utils
label_desc: Use image node_id 1 for calling a global function with example usage: test_string_representations_of_constant_object() without return types