diff --git a/Lib/test/test_multiprocessing.py b/Lib/test/test_multiprocessing.py
index 2614689..dc41e15 100644
--- a/Lib/test/test_multiprocessing.py
+++ b/Lib/test/test_multiprocessing.py
@@ -1089,6 +1089,9 @@
         self.assertEqual(sorted(it), list(map(sqr, list(range(1000)))))
 
     def test_make_pool(self):
+        self.assertRaises(ValueError, multiprocessing.Pool, -1)
+        self.assertRaises(ValueError, multiprocessing.Pool, 0)
+
         p = multiprocessing.Pool(3)
         self.assertEqual(3, len(p._pool))
         p.close()