Actually test callbacks in GetUpdatesTest.

The tests in GetUpdatesTest had some callback logic that has
been dead code for at least three months.  We now fully exercise
the callback codepath and make sure that the callbacks do happen.

(imported from commit f5d8fbab28ecc34dc81d3d0c29058b66c10f378f)

zephyr/tests.py

@@ -1555,10 +1555,22 @@ class S3Test(AuthedTestCase):
             self.test_uris.remove(uri)
 
 
+class DummyStream:
+    def closed(self):
+        return False
+
+class DummyObject:
+    pass
+
+class DummyTornadoRequest:
+    def __init__(self):
+        self.connection = DummyObject()
+        self.connection.stream = DummyStream()
 
 class DummyHandler(object):
     def __init__(self, assert_callback):
         self.assert_callback = assert_callback
+        self.request = DummyTornadoRequest()
 
     # Mocks RequestHandler.async_callback, which wraps a callback to
     # handle exceptions.  We return the callback as-is.
@@ -1568,10 +1580,11 @@ class DummyHandler(object):
     def write(self, response):
         raise NotImplemented
 
-    def finish(self, response):
+    def humbug_finish(self, response, *ignore):
         if self.assert_callback:
             self.assert_callback(response)
 
+
 class DummySession(object):
     session_key = "0"
 
@@ -1589,18 +1602,25 @@ class GetUpdatesTest(AuthedTestCase):
 
     def common_test_get_updates(self, view_func, extra_post_data = {}):
         user_profile = self.get_user_profile("hamlet@humbughq.com")
+        message_content = 'tornado test message'
+        self.got_callback = False
 
         def callback(response):
-            correct_message_ids = [m.id for m in
-                filter_by_subscriptions(Message.objects.all(), user_profile)]
-            for message in response['messages']:
-                self.assertGreater(message['id'], 1)
-                self.assertIn(message['id'], correct_message_ids)
+            self.got_callback = True
+            msg = response['messages'][0]
+            if str(msg['content_type']) == 'text/html':
+                self.assertEqual('<p>%s</p>' % message_content, msg['content'])
+            else:
+                self.assertEqual(message_content, msg['content'])
 
         post_data = {}
         post_data.update(extra_post_data)
         request = POSTRequestMock(post_data, user_profile, callback)
         self.assertEqual(view_func(request), RespondAsynchronously)
+        self.send_message("hamlet@humbughq.com", "hamlet@humbughq.com",
+                Recipient.PERSONAL, message_content)
+        self.assertTrue(self.got_callback)
+
 
     def test_json_get_updates(self):
         """