def test_get_set_property(self):
trait = CTrait(TraitKind.trait)
# Get the property, ensure None
self.assertIsNone(trait.property_fields)
def value_get(self):
return self.__dict__.get("_value", 0)
def value_set(self, value):
old_value = self.__dict__.get("_value", 0)
if value != old_value:
self._value = value
self.trait_property_changed("value", old_value, value)
# Set the callables
trait.property_fields = (value_get, value_set, None)
fget, fset, validate = trait.property_fields
self.assertIs(fget, value_get)
self.assertIs(fset, value_set)
self.assertIsNone(validate)
# Ensure that _get_property does not accept arguments.
with self.assertRaises(TypeError):
trait._get_property(fget)
def test_is_property(self):
trait = CTrait(TraitKind.trait)
self.assertFalse(trait.is_property)
trait.property_fields = (getter, setter, validator)
self.assertTrue(trait.is_property)
with self.assertRaises(AttributeError):
trait.is_property = False
