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/histogram_tester.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   void SetUp() override { metrics_.reset(new SpellCheckHostMetrics); }
  31
  32   SpellCheckHostMetrics* metrics() { return metrics_.get(); }
  33   void RecordWordCountsForTesting() { metrics_->RecordWordCounts(); }
  34
  35  private:
  36   base::MessageLoop loop_;
  37   scoped_ptr<SpellCheckHostMetrics> metrics_;
  38 };
  39
  40 TEST_F(SpellcheckHostMetricsTest, RecordEnabledStats) {
  41   const char kMetricName[] = "SpellCheck.Enabled";
  42   base::HistogramTester histogram_tester1;
  43
  44   metrics()->RecordEnabledStats(false);
  45
  46   histogram_tester1.ExpectBucketCount(kMetricName, 0, 1);
  47   histogram_tester1.ExpectBucketCount(kMetricName, 1, 0);
  48
  49   base::HistogramTester histogram_tester2;
  50
  51   metrics()->RecordEnabledStats(true);
  52
  53   histogram_tester2.ExpectBucketCount(kMetricName, 0, 0);
  54   histogram_tester2.ExpectBucketCount(kMetricName, 1, 1);
  55 }
  56
  57 TEST_F(SpellcheckHostMetricsTest, CustomWordStats) {
  58 #if defined(OS_WIN)
  59 // Failing consistently on Win7. See crbug.com/230534.
  60   if (base::win::GetVersion() >= base::win::VERSION_VISTA)
  61     return;
  62 #endif
  63   SpellCheckHostMetrics::RecordCustomWordCountStats(123);
  64
  65   // Determine if test failures are due the statistics recorder not being
  66   // available or because the histogram just isn't there: crbug.com/230534.
  67   EXPECT_TRUE(base::StatisticsRecorder::IsActive());
  68
  69   base::HistogramTester histogram_tester;
  70
  71   SpellCheckHostMetrics::RecordCustomWordCountStats(23);
  72   histogram_tester.ExpectBucketCount("SpellCheck.CustomWords", 23, 1);
  73 }
  74
  75 TEST_F(SpellcheckHostMetricsTest, RecordWordCountsDiscardsDuplicates) {
  76   // This test ensures that RecordWordCounts only records metrics if they
  77   // have changed from the last invocation.
  78   const char* const histogram_names[] = {
  79       "SpellCheck.CheckedWords", "SpellCheck.MisspelledWords",
  80       "SpellCheck.ReplacedWords", "SpellCheck.UniqueWords",
  81       "SpellCheck.ShownSuggestions"};
  82
  83   // Ensure all histograms exist.
  84   metrics()->RecordCheckedWordStats(base::ASCIIToUTF16("test"), false);
  85   RecordWordCountsForTesting();
  86
  87   // Create the tester, taking a snapshot of current histogram samples.
  88   base::HistogramTester histogram_tester;
  89
  90   // Nothing changed, so this invocation should not affect any histograms.
  91   RecordWordCountsForTesting();
  92
  93   // Get samples for all affected histograms.
  94   for (size_t i = 0; i < arraysize(histogram_names); ++i)
  95     histogram_tester.ExpectTotalCount(histogram_names[i], 0);
  96 }
  97
  98 TEST_F(SpellcheckHostMetricsTest, RecordSpellingServiceStats) {
  99   const char kMetricName[] = "SpellCheck.SpellingService.Enabled";
 100   base::HistogramTester histogram_tester1;
 101
 102   metrics()->RecordSpellingServiceStats(false);
 103
 104   histogram_tester1.ExpectBucketCount(kMetricName, 0, 1);
 105   histogram_tester1.ExpectBucketCount(kMetricName, 1, 0);
 106
 107   base::HistogramTester histogram_tester2;
 108
 109   metrics()->RecordSpellingServiceStats(true);
 110   histogram_tester2.ExpectBucketCount(kMetricName, 0, 0);
 111   histogram_tester2.ExpectBucketCount(kMetricName, 1, 1);
 112 }