def test_big_list(self):
big_list = [1, 2, 3, 4, 5]
result = images2grey.list_split(big_list, 3)
self.assertEqual(next(result), big_list[0:1])
self.assertEqual(next(result), big_list[1:2])
self.assertEqual(next(result), big_list[2:])
self.assertRaises(StopIteration, lambda: next(result))
def test_simple_list(self):
simple = [1, 2, 3]
result = images2grey.list_split(simple, len(simple))
for i in range(len(simple)):
self.assertEqual(next(result), simple[i:i+1])
