Function test_misbehaving_object_without_trait_names

tests/test_dir2.py:42–66

()

def test_misbehaving_object_without_trait_names():
    # dir2 shouldn't raise even when objects are dumb and raise
    # something other than AttribteErrors on bad getattr.

    class MisbehavingGetattr:
        def __getattr__(self, attr):
            raise KeyError("I should be caught")

        def some_method(self):
            return True

    class SillierWithDir(MisbehavingGetattr):
        def __dir__(self):
            return ["some_method"]

    for bad_klass in (MisbehavingGetattr, SillierWithDir):
        obj = bad_klass()

        assert obj.some_method()

        with pytest.raises(KeyError):
            obj.other_method()

        res = dir2(obj)
        assert "some_method" in res