sandwich: Fixes some failures in request_track.py

tools/android/loading/request_track_unittest.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 copy
 import json
 import sys
 import unittest
 
 from request_track import (TimeBetween, Request, CachingPolicy, RequestTrack,
@@ skipping 474 matching lines @@
     request['params']['initiator']['type'] = 'script'
     self.request_track.Handle('Network.requestWillBeSent', request)
     self.assertEquals(1, self.request_track.inconsistent_initiators_count)
 
   def testRejectDuplicates(self):
     msg = RequestTrackTestCase._REQUEST_WILL_BE_SENT
     self.request_track.Handle('Network.requestWillBeSent', msg)
     with self.assertRaises(AssertionError):
       self.request_track.Handle('Network.requestWillBeSent', msg)
 
+  def testIgnoreCompletedDuplicates(self):
+    self.request_track.Handle('Network.requestWillBeSent',
+                              RequestTrackTestCase._REQUEST_WILL_BE_SENT)
+    self.request_track.Handle('Network.responseReceived',
+                              RequestTrackTestCase._RESPONSE_RECEIVED)
+    self.request_track.Handle('Network.loadingFinished',
+                              RequestTrackTestCase._LOADING_FINISHED)
+    # Should not raise an AssertionError.
+    self.request_track.Handle('Network.requestWillBeSent',
+                              RequestTrackTestCase._REQUEST_WILL_BE_SENT)
+
   def testSequenceOfGeneratedResponse(self):
     self.request_track.Handle('Network.requestServedFromCache',
                               RequestTrackTestCase._SERVED_FROM_CACHE)
     self.request_track.Handle('Network.loadingFinished',
                               RequestTrackTestCase._LOADING_FINISHED)
     self.assertEquals(0, len(self.request_track.GetEvents()))
 
   def testInvalidSequence(self):
     msg1 = RequestTrackTestCase._REQUEST_WILL_BE_SENT
     msg2 = RequestTrackTestCase._LOADING_FINISHED
@@ skipping 111 matching lines @@
   def _ValidSequence(cls, request_track):
     request_track.Handle(
         'Network.requestWillBeSent', cls._REQUEST_WILL_BE_SENT)
     request_track.Handle('Network.responseReceived', cls._RESPONSE_RECEIVED)
     request_track.Handle('Network.dataReceived', cls._DATA_RECEIVED_1)
     request_track.Handle('Network.dataReceived', cls._DATA_RECEIVED_2)
     request_track.Handle('Network.loadingFinished', cls._LOADING_FINISHED)
 
 if __name__ == '__main__':
   unittest.main()