code: def test_choice_property_on_unknown_instance(self):
      prop = ChoiceProperty(choices=[1, 2, 3])
      self.assertEqual(None, prop.__get__(None, None))
  
imports: from collections import namedtuple
  import numpy
  from neupy.core.config import Configurable
  from neupy.core.properties import Property, ArrayProperty, TypedListProperty, BoundedProperty, ProperFractionProperty, NumberProperty, IntProperty, ChoiceProperty, WithdrawProperty
  from base import BaseTestCase
label_desc: Use image node_id 5 for calling the ChoicesPropertiesTestCase obj's underlying member method code with example usage: obj.test_choice_property_on_unknown_instance() without return types