class Foo():
    def __test(self):
        pass

    def __test__(self):
        pass

    def ___(self):
        pass

let f = Foo()

let dirResults = dir(f)

# Straightforard name-mangling and non-mangling casses
assert '_Foo__test' in dirResults
assert '__test__' in dirResults
assert '_Foo__test__' not in dirResults
assert '___' in dirResults
assert '_Foo____' not in dirResults

class Baz():
    def __init__(self):
        class __Inner():
            def __test(self):
                pass
        self.__inner = __Inner

let b = Baz()

assert '_Baz__inner' in dir(b)

# Inner class name should not be mangled on its own
assert b._Baz__inner.__name__ == '__Inner'

# Mangled identifiers should reduce leading underscores from class name to one
assert '_Inner__test' in dir(b._Baz__inner)

print("okay")