def test_MixColumnsInv(self):
instance = AES()
# full inversion test
for i in xrange(0, len(self.gf_full), 16):
test_input = self.gf_full[i:i + 16]
self.assertEquals(
test_input,
instance.MixColumnsInv(instance.MixColumns(test_input)))
self.assertNotEqual(test_input, instance.MixColumnsInv(test_input))
