code: def test_assign_enum_value(self):
      example = self.Example()
      example.color = Color.green
      self.assertEqual(example.color, Color.green)
  
imports: import unittest
  import enum
  from ipython_genutils.py3compat import string_types
  from traitlets import HasTraits, TraitError, UseEnum
label_desc: Use image node_id 1 for calling the TestUseEnum obj's underlying member method code with example usage: obj.test_assign_enum_value() without return types