def test_class_gt_instance(self):
t1 = test_classes.TestClass()
t2 = test_classes.TestClass()
self.assertEqual(test_classes.TestClass.rw_attr, "change_me")
self.assertEqual(t1.rw_attr, "change_me")
self.assertEqual(t2.rw_attr, "change_me")
# change the instance value
t1.rw_attr = "new"
self.assertEqual(test_classes.TestClass.rw_attr, "new")
self.assertEqual(t1.rw_attr, "new")
self.assertEqual(t2.rw_attr, "new")
# change the class value
test_classes.TestClass.rw_attr = "another_one"
self.assertEqual(test_classes.TestClass.rw_attr, "another_one")
self.assertEqual(t1.rw_attr, "another_one")
self.assertEqual(t2.rw_attr, "another_one")
# delete the instance value
del t1.rw_attr
with self.assertRaises(AttributeError):
test_classes.TestClass.rw_attr
with self.assertRaises(AttributeError):
t1.rw_attr
with self.assertRaises(AttributeError):
t2.rw_attr
def test_read_only_property(self):
# basic test
self.assertEqual(test_classes.TestClass.ro_attr, "read-only")
# try changing or deleting
with self.assertRaises(AttributeError):
test_classes.TestClass.ro_attr = "changed"
with self.assertRaises(AttributeError):
del test_classes.TestClass.ro_attr
# do the same with an instance
t = test_classes.TestClass()
with self.assertRaises(AttributeError):
t.ro_attr = "changed"
with self.assertRaises(AttributeError):
del t.ro_attr
def test_property_is_bound_to_class(self):
t = test_classes.TestClass()
self.assertEqual(test_classes.TestClass.rw_attr, "change_me")
self.assertEqual(t.rw_attr, "change_me")
# change class value
test_classes.TestClass.rw_attr = "new"
self.assertEqual(test_classes.TestClass.rw_attr, "new")
self.assertEqual(t.rw_attr, "new")
# delete the value
del test_classes.TestClass.rw_attr
with self.assertRaises(AttributeError):
test_classes.TestClass.rw_attr
with self.assertRaises(AttributeError):
t.rw_attr