diff --git a/Lib/test/test_array.py b/Lib/test/test_array.py
index 105cf73..9f5c09d 100644
--- a/Lib/test/test_array.py
+++ b/Lib/test/test_array.py
@@ -247,6 +247,7 @@
         self.assertRaises(TypeError, a.tostring, 42)
         self.assertRaises(TypeError, b.fromstring)
         self.assertRaises(TypeError, b.fromstring, 42)
+        self.assertRaises(ValueError, a.fromstring, a)
         b.fromstring(a.tostring())
         self.assertEqual(a, b)
         if a.itemsize>1: