test that config objects are pickleable

IPython/config/tests/test_loader.py

@@ -20,6 +20,7 b' Authors:'
 #-----------------------------------------------------------------------------
 
 import os
+import pickle
 import sys
 from tempfile import mkstemp
 from unittest import TestCase
@@ -289,4 +290,10 b' class TestConfig(TestCase):'
         self.assertIn('Foo.bar', c2)
         self.assertNotIn('Foo.bar', c1)
     
+    def test_pickle_config(self):
+        cfg = Config()
+        cfg.Foo.bar = 1
+        pcfg = pickle.dumps(cfg)
+        cfg2 = pickle.loads(pcfg)
+        self.assertEqual(cfg2, cfg)