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
21class 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
42TEST_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
59TEST_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
77TEST_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
100TEST_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