def test_property_is_fixed(self):
element = ElementBase()
self.assertFalse(element.is_fixed)
element.fixed = None
self.assertFalse(element.is_fixed)
element.fixed = "foo"
self.assertTrue(element.is_fixed)
def test_property_default_value(self):
element = ElementBase()
self.assertIsNone(element.default_value)
element.fixed = "foo"
self.assertEqual("foo", element.default_value)
element.default = "bar"
self.assertEqual("bar", element.default_value)
element.default = ""
self.assertEqual("", element.default_value)
element.default = None
element.fixed = ""
self.assertEqual("", element.default_value)
