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      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 }
    115