def test_brokenClassNameAttribute(self):
        """
        If a class raises an exception when accessing its C{__name__} attribute
        B{and} when calling its C{__str__} implementation, L{reflect.safe_repr}
        returns 'BROKEN CLASS' instead of the class name.
        """
        class X(BTBase):
            breakName = True
        xRepr = reflect.safe_repr(X())
        self.assertIn("<BROKEN CLASS AT 0x", xRepr)
        self.assertIn(os.path.splitext(__file__)[0], xRepr)
        self.assertIn("RuntimeError: repr!", xRepr)

        If a class raises an exception when accessing its C{__name__} attribute
        B{and} when calling its C{__str__} implementation, L{reflect.safe_repr}
        returns 'BROKEN CLASS' instead of the class name.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_reflect.py