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