diff --git a/Lib/test/test_array.py b/Lib/test/test_array.py
index 79e1199..3dd4f6d 100755
--- a/Lib/test/test_array.py
+++ b/Lib/test/test_array.py
@@ -272,6 +272,12 @@
             a,
             array.array(self.typecode, self.example[::-1]+2*self.example)
         )
+        a = array.array(self.typecode, self.example)
+        a += a
+        self.assertEqual(
+            a,
+            array.array(self.typecode, self.example + self.example)
+        )
 
         b = array.array(self.badtypecode())
         self.assertRaises(TypeError, a.__add__, b)
@@ -667,6 +673,13 @@
             array.array(self.typecode, self.example+self.example[::-1])
         )
 
+        a = array.array(self.typecode, self.example)
+        a.extend(a)
+        self.assertEqual(
+            a,
+            array.array(self.typecode, self.example+self.example)
+        )
+
         b = array.array(self.badtypecode())
         self.assertRaises(TypeError, a.extend, b)