import platform from rustapi_module.subclassing import Subclassable PYPY = platform.python_implementation() == "PyPy" class SomeSubClass(Subclassable): def __str__(self): return "SomeSubclass" def test_subclassing(): if not PYPY: a = SomeSubClass() assert str(a) == "SomeSubclass" assert type(a) is SomeSubClass