def test_fromBox(self):
        """
        L{ListOf.fromBox} reverses the operation performed by L{ListOf.toBox}.
        """
        stringList = amp.ListOf(self.elementType)
        objects = {}
        for key in self.strings:
            stringList.fromBox(key, self.strings.copy(), objects, None)
        self.assertEqual(objects, self.objects)

        L{ListOf.fromBox} reverses the operation performed by L{ListOf.toBox}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_amp.py