def test_multipleChildSegments(self):
        """
        C{fp.descendant([a, b, c])} returns the same L{FilePath} as is returned
        by C{fp.child(a).child(b).child(c)}.
        """
        multiple = self.path.descendant([b'a', b'b', b'c'])
        single = self.path.child(b'a').child(b'b').child(b'c')
        self.assertEqual(multiple, single)

        C{fp.descendant([a, b, c])} returns the same L{FilePath} as is returned
        by C{fp.child(a).child(b).child(c)}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_paths.py