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   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::HistogramTester histogram_tester1;
  45
  46   metrics()->RecordEnabledStats(false);
  47
  48   histogram_tester1.ExpectBucketCount(kMetricName, 0, 1);
  49   histogram_tester1.ExpectBucketCount(kMetricName, 1, 0);
  50
  51   base::HistogramTester histogram_tester2;
  52
  53   metrics()->RecordEnabledStats(true);
  54
  55   histogram_tester2.ExpectBucketCount(kMetricName, 0, 0);
  56   histogram_tester2.ExpectBucketCount(kMetricName, 1, 1);
  57 }
  58
  59 TEST_F(SpellcheckHostMetricsTest, CustomWordStats) {
  60 #if defined(OS_WIN)
  61 // Failing consistently on Win7. See crbug.com/230534.
  62   if (base::win::GetVersion() >= base::win::VERSION_VISTA)
  63     return;
  64 #endif
  65   SpellCheckHostMetrics::RecordCustomWordCountStats(123);
  66
  67   // Determine if test failures are due the statistics recorder not being
  68   // available or because the histogram just isn't there: crbug.com/230534.
  69   EXPECT_TRUE(base::StatisticsRecorder::IsActive());
  70
  71   base::HistogramTester histogram_tester;
  72
  73   SpellCheckHostMetrics::RecordCustomWordCountStats(23);
  74   histogram_tester.ExpectBucketCount("SpellCheck.CustomWords", 23, 1);
  75 }
  76
  77 TEST_F(SpellcheckHostMetricsTest, RecordWordCountsDiscardsDuplicates) {
  78   // This test ensures that RecordWordCounts only records metrics if they
  79   // have changed from the last invocation.
  80   const char* const histogram_names[] = {
  81       "SpellCheck.CheckedWords", "SpellCheck.MisspelledWords",
  82       "SpellCheck.ReplacedWords", "SpellCheck.UniqueWords",
  83       "SpellCheck.ShownSuggestions"};
  84
  85   // Ensure all histograms exist.
  86   metrics()->RecordCheckedWordStats(base::ASCIIToUTF16("test"), false);
  87   RecordWordCountsForTesting();
  88
  89   // Create the tester, taking a snapshot of current histogram samples.
  90   base::HistogramTester histogram_tester;
  91
  92   // Nothing changed, so this invocation should not affect any histograms.
  93   RecordWordCountsForTesting();
  94
  95   // Get samples for all affected histograms.
  96   for (size_t i = 0; i < arraysize(histogram_names); ++i)
  97     histogram_tester.ExpectTotalCount(histogram_names[i], 0);
  98 }
  99
 100 TEST_F(SpellcheckHostMetricsTest, RecordSpellingServiceStats) {
 101   const char kMetricName[] = "SpellCheck.SpellingService.Enabled";
 102   base::HistogramTester histogram_tester1;
 103
 104   metrics()->RecordSpellingServiceStats(false);
 105
 106   histogram_tester1.ExpectBucketCount(kMetricName, 0, 1);
 107   histogram_tester1.ExpectBucketCount(kMetricName, 1, 0);
 108
 109   base::HistogramTester histogram_tester2;
 110
 111   metrics()->RecordSpellingServiceStats(true);
 112   histogram_tester2.ExpectBucketCount(kMetricName, 0, 0);
 113   histogram_tester2.ExpectBucketCount(kMetricName, 1, 1);
 114 }