diff --git a/test_insertion_sort01.py b/test_insertion_sort01.py
index 47291ee..baff970 100644
--- a/test_insertion_sort01.py
+++ b/test_insertion_sort01.py
@@ -1,3 +1,4 @@
+import random
 import unittest
 
 import insertion_sort01
@@ -14,6 +15,26 @@ class Test(unittest.TestCase):
 
         self.assertEqual(expected, a)
 
+    def test_big_example(self):
+        tmpl = list(range(0, 1000))
+        a = tmpl[:]
+        random.shuffle(a)
+        expected = tmpl[:]
+
+        insertion_sort01.insertion_sort(a)
+
+        self.assertEqual(expected, a)
+
+    def test_bigger_example(self):
+        tmpl = list(range(0, 10000))
+        a = tmpl[:]
+        random.shuffle(a)
+        expected = tmpl[:]
+
+        insertion_sort01.insertion_sort(a)
+
+        self.assertEqual(expected, a)
+
 
 if __name__ == '__main__':
     unittest.main()