def test_diff_at(self):
blob = Blob()
blob.set_diff(numpy.array(range(4)).reshape(2, 2))
res = blob.diff_at((1, 1))
self.assertEqual(res, 3)
def test_diff_at(self):
blob = Blob()
blob.set_diff(numpy.array(range(4)).reshape(2, 2))
res = blob.diff_at((1, 1))
self.assertEqual(res, 3)
