def test_objcmetaclass_caching(self):
"""ObjCMetaClass instances are cached."""
ExampleMeta1 = ObjCMetaClass("Example")
ExampleMeta2 = ObjCMetaClass("Example")
self.assertIs(ExampleMeta1, ExampleMeta2)
def test_objcmetaclass_requires_metaclass(self):
"""ObjCMetaClass only accepts metaclass pointers."""
random_obj = NSObject.alloc().init()
with self.assertRaises(ValueError):
ObjCMetaClass(random_obj.ptr)
with self.assertRaises(ValueError):
ObjCMetaClass(NSObject.ptr)
def test_objcclass_can_produce_objcmetaclass(self):
"""Creating an ObjCClass for a metaclass pointer gives an ObjCMetaclass."""
examplemeta_ptr = libobjc.objc_getMetaClass(b"Example")
ExampleMeta = ObjCClass(examplemeta_ptr)
self.assertEqual(ExampleMeta, ObjCMetaClass("Example"))
self.assertIsInstance(ExampleMeta, ObjCMetaClass)
def test_metaclass_by_name(self):
"""An Objective-C metaclass can be looked up by name."""
Example = ObjCClass("Example")
ExampleMeta = ObjCMetaClass("Example")
self.assertEqual(ExampleMeta.name, "Example")
self.assertEqual(ExampleMeta, Example.objc_class)
def test_metametaclass(self):
"""The class of a metaclass can be looked up."""
ExampleMeta = ObjCMetaClass("Example")
ExampleMetaMeta = ExampleMeta.objc_class
self.assertIsInstance(ExampleMetaMeta, ObjCMetaClass)
self.assertEqual(ExampleMetaMeta, NSObject.objc_class)
def test_nonexistant_metaclass(self):
"""A NameError is raised if a metaclass doesn't exist."""
with self.assertRaises(NameError):
ObjCMetaClass('DoesNotExist')
def test_metaclass_by_pointer(self):
"""An Objective-C metaclass can be created from a pointer."""
examplemeta_ptr = libobjc.objc_getMetaClass(b"Example")
ExampleMeta = ObjCMetaClass(examplemeta_ptr)
self.assertEqual(ExampleMeta, ObjCMetaClass("Example"))