[Findit] Modify handlers_util to prepare for the new UI change.

appengine/findit/handlers/test/swarming_task_test.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import webapp2
 
 from testing_utils import testing
 
 from handlers import swarming_task
 from waterfall import buildbot
+from waterfall import waterfall_config
 
 class SwarmingTaskTest(testing.AppengineTestCase):
   app_module = webapp2.WSGIApplication([
       ('/swarming-task', swarming_task.SwarmingTask),], debug=True)
 
   def setUp(self):
     super(SwarmingTaskTest, self).setUp()
     self.master_name = 'm'
     self.builder_name = 'b'
     self.build_number = 121
 
+    def MockedGetSwarmingSettings():
+      return {'server_host': 'chromium-swarm.appspot.com'}
+    self.mock(
+        waterfall_config, 'GetSwarmingSettings', MockedGetSwarmingSettings)
+
   def testSwarmingTaskHandler(self):
     build_url = buildbot.CreateBuildUrl(
         self.master_name, self.builder_name, self.build_number)
     response = self.test_app.get('/swarming-task', params={'url': build_url})
     expected_results = {}
 
     self.assertEqual(200, response.status_int)
     self.assertEqual(expected_results, response.json_body)