tools/profile_chrome/perf_controller_unittest.py

   1 # Copyright 2014 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 import os
   6 import json
   7
   8 from profile_chrome import controllers_unittest
   9 from profile_chrome import perf_controller
  10 from profile_chrome import ui
  11
  12 from pylib import constants
  13
  14
  15 class PerfProfilerControllerTest(controllers_unittest.BaseControllerTest):
  16   def testGetCategories(self):
  17     if not perf_controller.PerfProfilerController.IsSupported():
  18       return
  19     categories = \
  20         perf_controller.PerfProfilerController.GetCategories(self.device)
  21     assert 'cycles' in ' '.join(categories)
  22
  23   def testTracing(self):
  24     if not perf_controller.PerfProfilerController.IsSupported():
  25       return
  26     ui.EnableTestMode()
  27     categories = ['cycles']
  28     controller = perf_controller.PerfProfilerController(self.device,
  29                                                         categories)
  30
  31     interval = 1
  32     try:
  33       controller.StartTracing(interval)
  34     finally:
  35       controller.StopTracing()
  36
  37     result = controller.PullTrace()
  38     try:
  39       with open(result) as f:
  40         json.loads(f.read())
  41     finally:
  42       os.remove(result)