def testOptionValue_CommandsExist__parse_option(self):
        with self.assertRaises(ValueError):
            self.plugin.parse_option('block', 'apps', 'non-existent-cmd')
        with self.assertRaises(ValueError):
            self.plugin.parse_option('block', 'apps', '/bin/non-existent-cmd')
This test will ensure a position only allows objects for its 
dataset/ETHPy150Open xtrementl/focus/tests/unit/plugin/modules/test_apps.py/TestAppBlock.testOptionValue_CommandsExist__parse_option--crossover with--dataset/ETHPy150Open callowayproject/django-kamasutra/positions/tests.py/PositionsTestCase.testAddObject