diff -r 19ed42e84030 Lib/test/test_multiprocessing.py
--- a/Lib/test/test_multiprocessing.py	Thu Oct 25 10:47:46 2012 +0100
+++ b/Lib/test/test_multiprocessing.py	Thu Oct 25 13:06:20 2012 +0300
@@ -1642,6 +1642,28 @@
         self.assertEqual(self.pool.starmap_async(mul, tuples).get(),
                          list(itertools.starmap(mul, tuples)))
 
+    def test_map_async(self):
+        self.assertEqual(self.pool.map_async(sqr, list(range(10))).get(),
+                         list(map(sqr, list(range(10)))))
+
+    def create_list(self):
+        if self.TYPE == 'manager':
+            return self.manager.list()
+        else:
+            return []
+                     
+    def test_map_async_callback(self):
+        res = self.create_list()
+        self.pool.map_async(sqr, list(range(10)),
+                            callback=res.append).wait()
+        self.assertIn(list(map(sqr, list(range(10)))), res)
+    
+    def test_map_async_error_callback(self):
+        err = self.create_list()
+        self.pool.map_async(int, ['a'], error_callback=err.append).wait()
+        self.assertEqual(len(err), 1)
+        self.assertIsInstance(err[0], ValueError)
+    
     def test_map_chunksize(self):
         try:
             self.pool.map_async(sqr, [], chunksize=1).get(timeout=TIMEOUT1)