diff --git a/IPython/config/tests/test_loader.py b/IPython/config/tests/test_loader.py
index ffb94b8..d68334f 100644
--- a/IPython/config/tests/test_loader.py
+++ b/IPython/config/tests/test_loader.py
@@ -261,3 +261,24 @@ class TestConfig(TestCase):
         exec 'foo = True' in c1
         self.assertEqual(c1.foo, True)
         self.assertRaises(ConfigError, setattr, c1, 'ValueError', 10)
+    
+    def test_fromdict(self):
+        c1 = Config({'Foo' : {'bar' : 1}})
+        self.assertEqual(c1.Foo.__class__, Config)
+        self.assertEqual(c1.Foo.bar, 1)
+    
+    def test_fromdict_merge(self):
+        c1 = Config()
+        c2 = Config({'Foo' : {'bar' : 1}})
+        c1._merge(c2)
+        self.assertEqual(c1.Foo.__class__, Config)
+        self.assertEqual(c1.Foo.bar, 1)
+
+    def test_fromdict_merge2(self):
+        c1 = Config({'Foo' : {'baz' : 2}})
+        c2 = Config({'Foo' : {'bar' : 1}})
+        c1._merge(c2)
+        self.assertEqual(c1.Foo.__class__, Config)
+        self.assertEqual(c1.Foo.bar, 1)
+        self.assertEqual(c1.Foo.baz, 2)
+        self.assertRaises(AttributeError, getattr, c2.Foo, 'baz')