No longer adding in the 'data' wrapper object if it is missing, as some APIs don't use it.
diff --git a/tests/test_json_model.py b/tests/test_json_model.py
index 2bf0302..5ce9b63 100644
--- a/tests/test_json_model.py
+++ b/tests/test_json_model.py
@@ -62,7 +62,7 @@
     self.assertEqual(headers['accept'], 'application/json')
     self.assertEqual(headers['content-type'], 'application/json')
     self.assertNotEqual(query, '')
-    self.assertEqual(body, '{"data": {}}')
+    self.assertEqual(body, '{}')
 
   def test_json_body_default_data(self):
     """Test that a 'data' wrapper doesn't get added if one is already present."""
@@ -96,7 +96,7 @@
     query_dict = parse_qs(query)
     self.assertEqual(query_dict['foo'], ['1'])
     self.assertEqual(query_dict['bar'], [u'\N{COMET}'.encode('utf-8')])
-    self.assertEqual(body, '{"data": {}}')
+    self.assertEqual(body, '{}')
 
   def test_user_agent(self):
     model = JsonModel()