def test_inheritedDescriptors(self):
        """
        C{inheritedDescriptors} returns a list of integers giving the file
        descriptors which were inherited from systemd.
        """
        sddaemon = self.getDaemon(7, 3)
        self.assertEqual([7, 8, 9], sddaemon.inheritedDescriptors())

        C{inheritedDescriptors} returns a list of integers giving the file
        descriptors which were inherited from systemd.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/test/test_systemd.py