chrome/browser/spellchecker/spellcheck_host_metrics_unittest.cc

   1 // Copyright (c) 2012 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 #include "chrome/browser/spellchecker/spellcheck_host_metrics.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/message_loop/message_loop.h"
  10 #include "base/metrics/histogram_samples.h"
  11 #include "base/metrics/statistics_recorder.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "base/test/statistics_delta_reader.h"
  14 #include "testing/gtest/include/gtest/gtest.h"
  15
  16 #if defined(OS_WIN)
  17 // For version specific disabled tests below (http://crbug.com/230534).
  18 #include "base/win/windows_version.h"
  19 #endif
  20
  21 class SpellcheckHostMetricsTest : public testing::Test {
  22  public:
  23   SpellcheckHostMetricsTest() {
  24   }
  25
  26   static void SetUpTestCase() {
  27     base::StatisticsRecorder::Initialize();
  28   }
  29
  30   virtual void SetUp() OVERRIDE {
  31     metrics_.reset(new SpellCheckHostMetrics);
  32   }
  33
  34   SpellCheckHostMetrics* metrics() { return metrics_.get(); }
  35   void RecordWordCountsForTesting() { metrics_->RecordWordCounts(); }
  36
  37  private:
  38   base::MessageLoop loop_;
  39   scoped_ptr<SpellCheckHostMetrics> metrics_;
  40 };
  41
  42 TEST_F(SpellcheckHostMetricsTest, RecordEnabledStats) {
  43   const char kMetricName[] = "SpellCheck.Enabled";
  44   base::StatisticsDeltaReader statistics_delta_reader1;
  45
  46   metrics()->RecordEnabledStats(false);
  47
  48   scoped_ptr<base::HistogramSamples> samples(
  49       statistics_delta_reader1.GetHistogramSamplesSinceCreation(kMetricName));
  50   EXPECT_EQ(1, samples->GetCount(0));
  51   EXPECT_EQ(0, samples->GetCount(1));
  52
  53   base::StatisticsDeltaReader statistics_delta_reader2;
  54
  55   metrics()->RecordEnabledStats(true);
  56
  57   samples =
  58       statistics_delta_reader2.GetHistogramSamplesSinceCreation(kMetricName);
  59   EXPECT_EQ(0, samples->GetCount(0));
  60   EXPECT_EQ(1, samples->GetCount(1));
  61 }
  62
  63 TEST_F(SpellcheckHostMetricsTest, CustomWordStats) {
  64 #if defined(OS_WIN)
  65 // Failing consistently on Win7. See crbug.com/230534.
  66   if (base::win::GetVersion() >= base::win::VERSION_VISTA)
  67     return;
  68 #endif
  69   SpellCheckHostMetrics::RecordCustomWordCountStats(123);
  70
  71   // Determine if test failures are due the statistics recorder not being
  72   // available or because the histogram just isn't there: crbug.com/230534.
  73   EXPECT_TRUE(base::StatisticsRecorder::IsActive());
  74
  75   base::StatisticsDeltaReader statistics_delta_reader;
  76
  77   SpellCheckHostMetrics::RecordCustomWordCountStats(23);
  78
  79   scoped_ptr<base::HistogramSamples> samples(
  80       statistics_delta_reader.GetHistogramSamplesSinceCreation(
  81           "SpellCheck.CustomWords"));
  82   EXPECT_EQ(23, samples->sum());
  83 }
  84
  85 TEST_F(SpellcheckHostMetricsTest, RecordWordCountsDiscardsDuplicates) {
  86   // This test ensures that RecordWordCounts only records metrics if they
  87   // have changed from the last invocation.
  88   const char* histogramName[] = {
  89     "SpellCheck.CheckedWords",
  90     "SpellCheck.MisspelledWords",
  91     "SpellCheck.ReplacedWords",
  92     "SpellCheck.UniqueWords",
  93     "SpellCheck.ShownSuggestions"
  94   };
  95
  96   // Ensure all histograms exist.
  97   metrics()->RecordCheckedWordStats(base::ASCIIToUTF16("test"), false);
  98   RecordWordCountsForTesting();
  99
 100   // Start the reader.
 101   base::StatisticsDeltaReader statistics_delta_reader;
 102
 103   // Nothing changed, so this invocation should not affect any histograms.
 104   RecordWordCountsForTesting();
 105
 106   // Get samples for all affected histograms.
 107   scoped_ptr<base::HistogramSamples> samples;
 108   for (size_t i = 0; i < arraysize(histogramName); ++i) {
 109     samples = statistics_delta_reader.GetHistogramSamplesSinceCreation(
 110         histogramName[i]);
 111     EXPECT_EQ(0, samples->TotalCount());
 112   }
 113 }
 114
 115 TEST_F(SpellcheckHostMetricsTest, RecordSpellingServiceStats) {
 116   const char kMetricName[] = "SpellCheck.SpellingService.Enabled";
 117   base::StatisticsDeltaReader statistics_delta_reader1;
 118
 119   metrics()->RecordSpellingServiceStats(false);
 120
 121   scoped_ptr<base::HistogramSamples> samples(
 122       statistics_delta_reader1.GetHistogramSamplesSinceCreation(kMetricName));
 123   EXPECT_EQ(1, samples->GetCount(0));
 124   EXPECT_EQ(0, samples->GetCount(1));
 125
 126   base::StatisticsDeltaReader statistics_delta_reader2;
 127
 128   metrics()->RecordSpellingServiceStats(true);
 129
 130   samples =
 131       statistics_delta_reader2.GetHistogramSamplesSinceCreation(kMetricName);
 132   EXPECT_EQ(0, samples->GetCount(0));
 133   EXPECT_EQ(1, samples->GetCount(1));
 134 }