Janne Karila added the comment:

The length assertion protects the test from breaking with IndexError. How about 
this? Though, it looks like two test cases to me.

+        self.pool.map_async(int, ['1'],
+                            callback=call_args.append,
+                            error_callback=call_args.append).wait()
+        self.assertEqual(1, len(call_args))
+        self.assertEqual([1], call_args[0])
+        self.pool.map_async(int, ['a'],
+                            callback=call_args.append,
+                            error_callback=call_args.append).wait()
+        self.assertEqual(2, len(call_args))
+        self.assertIsInstance(call_args[1], ValueError)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16307>
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