tools/perf/measurements/v8_detached_context_age_in_gc_unittest.py

   1 # Copyright 2015 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 from measurements import v8_detached_context_age_in_gc
   6 from telemetry.core import wpr_modes
   7 from telemetry.page import page_test
   8 from telemetry.page import page as page_module
   9 from telemetry.results import page_test_results
  10 from telemetry.unittest_util import options_for_unittests
  11 from telemetry.unittest_util import page_test_test_case
  12 from telemetry.value import skip
  13
  14
  15 class FakePage(object):
  16   def __init__(self, url):
  17     self.url = url
  18     self.is_file = url.startswith('file://')
  19
  20
  21 class FakeTab(object):
  22   def __init__(self, histograms):
  23     self.histograms = histograms
  24     self.current_histogram_index = 0
  25
  26   def EvaluateJavaScript(self, script):
  27     if 'V8.DetachedContextAgeInGC' in script:
  28       self.current_histogram_index += 1
  29       return self.histograms[self.current_histogram_index - 1]
  30     return '{}'
  31
  32   def CollectGarbage(self):
  33     pass
  34
  35
  36 def _MeasureFakePage(histograms):
  37     results = page_test_results.PageTestResults()
  38     page = FakePage('file://blank.html')
  39     tab = FakeTab(histograms)
  40     metric = v8_detached_context_age_in_gc.V8DetachedContextAgeInGC()
  41     results.WillRunPage(page)
  42     metric.DidNavigateToPage(page, tab)
  43     metric.ValidateAndMeasurePage(page, tab, results)
  44     results.DidRunPage(page)
  45     return results
  46
  47
  48 def _ActualValues(results):
  49   return dict((v.name, v) for v in results.all_page_specific_values)
  50
  51
  52 class SimplePage(page_module.Page):
  53     def __init__(self, page_set):
  54       super(SimplePage, self).__init__(
  55           'file://host.html', page_set, page_set.base_dir)
  56     def RunPageInteractions(self, action_runner):
  57       # Reload the page to detach the previous context.
  58       action_runner.ReloadPage()
  59
  60
  61 class V8DetachedContextAgeInGCTests(page_test_test_case.PageTestTestCase):
  62
  63   def setUp(self):
  64     self._options = options_for_unittests.GetCopy()
  65     self._options.browser_options.wpr_mode = wpr_modes.WPR_OFF
  66
  67   def testWithNoData(self):
  68     histograms = [
  69         """{"count": 0, "buckets": []}""",
  70         """{"count": 0, "buckets": []}"""
  71     ]
  72     results = _MeasureFakePage(histograms)
  73     actual = _ActualValues(results)
  74     self.assertTrue('skip' in actual)
  75     self.assertFalse('V8_DetachedContextAgeInGC' in actual)
  76
  77   def testWithData(self):
  78     histograms = [
  79         """{"count": 3, "buckets": [{"low": 1, "high": 2, "count": 1},
  80                                     {"low": 2, "high": 3, "count": 2}]}""",
  81         """{"count": 4, "buckets": [{"low": 1, "high": 2, "count": 2},
  82                                     {"low": 2, "high": 3, "count": 2}]}""",
  83     ]
  84     results = _MeasureFakePage(histograms)
  85     actual = _ActualValues(results)['V8_DetachedContextAgeInGC']
  86     self.assertEqual(2, actual.value)
  87     self.assertEqual('garbage_collections', actual.units)
  88
  89   def testWithSimplePage(self):
  90     page_set = self.CreateEmptyPageSet()
  91     page = SimplePage(page_set)
  92     page_set.AddUserStory(page)
  93     metric = v8_detached_context_age_in_gc.V8DetachedContextAgeInGC()
  94     results = self.RunMeasurement(metric, page_set, options=self._options)
  95     self.assertEquals(0, len(results.failures))
  96     actual = _ActualValues(results)['V8_DetachedContextAgeInGC']
  97     self.assertLessEqual(0, actual.value)
  98     self.assertEqual('garbage_collections', actual.units)