diff --git a/itertools/test_itertools.py b/itertools/test_itertools.py
index f5fdff2c..51a29fd4 100644
--- a/itertools/test_itertools.py
+++ b/itertools/test_itertools.py
@@ -1,5 +1,5 @@
 import itertools
 
-print(list(itertools.islice(list(range(10)), 4)))
-print(list(itertools.islice(list(range(10)), 2, 6)))
-print(list(itertools.islice(list(range(10)), 2, 6, 2)))
+assert list(itertools.islice(list(range(10)), 4)) == [0, 1, 2, 3]
+assert list(itertools.islice(list(range(10)), 2, 6)) == [2, 3, 4, 5]
+assert list(itertools.islice(list(range(10)), 2, 6, 2)) == [2, 4]