import unittest from .util import MemorySetup, Traversable class TestMemoryTraversableImplementation(unittest.TestCase): def test_concrete_methods_are_not_overridden(self): """`MemoryTraversable` must not override `Traversable` concrete methods. This test is not an attempt to enforce a particular `Traversable` protocol; it merely catches changes in the `Traversable` abstract/concrete methods that have not been mirrored in the `MemoryTraversable` subclass. """ traversable_concrete_methods = { method for method, value in Traversable.__dict__.items() if callable(value) and method not in Traversable.__abstractmethods__ } memory_traversable_concrete_methods = { method for method, value in MemorySetup.MemoryTraversable.__dict__.items() if callable(value) and not method.startswith("__") } overridden_methods = ( memory_traversable_concrete_methods & traversable_concrete_methods ) assert not overridden_methods