# HG changeset patch
# Parent edbc62549c9b1eeb19955d4206e2de6a5c0301d2

diff --git a/Lib/test/test_json/test_default.py b/Lib/test/test_json/test_default.py
--- a/Lib/test/test_json/test_default.py
+++ b/Lib/test/test_json/test_default.py
@@ -7,6 +7,23 @@
             self.dumps(type, default=repr),
             self.dumps(repr(type)))
 
+    def test_dict_keys(self):
+        def default(obj):
+            if isinstance(obj, bytes):
+                return obj.decode('ascii')
+            raise TypeError
+        self.assertEqual(
+            self.loads(self.dumps({b'a' : 'b', 'b' : 'c'}, default=default)),
+            {'b' : 'c', 'a' : 'b'}
+        )
+        self.assertEqual(
+            self.loads(self.dumps({b'a' : 'b', 'b' : 'c', 1j: 2j},
+                skipkeys=True, default=default)),
+            {'b' : 'c', 'a' : 'b'}
+        )
+        with self.assertRaises(TypeError):
+            self.dumps({b'a' : 'b', 'b' : 'c', 1j: 2j}, default=default)
+
 
 class TestPyDefault(TestDefault, PyTest): pass
 class TestCDefault(TestDefault, CTest): pass