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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/spellchecker/spellcheck_host_metrics.h"
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop.h"
#include "base/metrics/histogram.h"
#include "base/metrics/histogram_samples.h"
#include "base/metrics/statistics_recorder.h"
#include "base/utf_string_conversions.h"
#include "testing/gtest/include/gtest/gtest.h"
using base::Histogram;
using base::HistogramSamples;
using base::StatisticsRecorder;
class SpellcheckHostMetricsTest : public testing::Test {
public:
SpellcheckHostMetricsTest() : loop_(MessageLoop::TYPE_DEFAULT) {
}
virtual void SetUp() OVERRIDE {
base::StatisticsRecorder::Initialize();
metrics_.reset(new SpellCheckHostMetrics);
}
SpellCheckHostMetrics* metrics() { return metrics_.get(); }
void RecordWordCountsForTesting() { metrics_->RecordWordCounts(); }
private:
MessageLoop loop_;
scoped_ptr<SpellCheckHostMetrics> metrics_;
};
TEST_F(SpellcheckHostMetricsTest, RecordEnabledStats) {
scoped_ptr<HistogramSamples> baseline;
Histogram* histogram =
StatisticsRecorder::FindHistogram("SpellCheck.Enabled");
if (histogram)
baseline = histogram->SnapshotSamples();
metrics()->RecordEnabledStats(false);
histogram =
StatisticsRecorder::FindHistogram("SpellCheck.Enabled");
ASSERT_TRUE(histogram != NULL);
scoped_ptr<HistogramSamples> samples(histogram->SnapshotSamples());
if (baseline.get())
samples->Subtract(*baseline);
EXPECT_EQ(1, samples->GetCount(0));
EXPECT_EQ(0, samples->GetCount(1));
baseline.reset(samples.release());
metrics()->RecordEnabledStats(true);
histogram =
StatisticsRecorder::FindHistogram("SpellCheck.Enabled");
ASSERT_TRUE(histogram != NULL);
samples = histogram->SnapshotSamples();
samples->Subtract(*baseline);
EXPECT_EQ(0, samples->GetCount(0));
EXPECT_EQ(1, samples->GetCount(1));
}
TEST_F(SpellcheckHostMetricsTest, CustomWordStats) {
metrics()->RecordCustomWordCountStats(123);
Histogram* histogram =
StatisticsRecorder::FindHistogram("SpellCheck.CustomWords");
ASSERT_TRUE(histogram != NULL);
scoped_ptr<HistogramSamples> baseline = histogram->SnapshotSamples();
metrics()->RecordCustomWordCountStats(23);
histogram =
StatisticsRecorder::FindHistogram("SpellCheck.CustomWords");
ASSERT_TRUE(histogram != NULL);
scoped_ptr<HistogramSamples> samples = histogram->SnapshotSamples();
samples->Subtract(*baseline);
EXPECT_EQ(23,samples->sum());
}
TEST_F(SpellcheckHostMetricsTest, RecordWordCountsDiscardsDuplicates) {
// This test ensures that RecordWordCounts only records metrics if they
// have changed from the last invocation.
const char* histogramName[] = {
"SpellCheck.CheckedWords",
"SpellCheck.MisspelledWords",
"SpellCheck.ReplacedWords",
"SpellCheck.UniqueWords",
"SpellCheck.ShownSuggestions"
};
// Ensure all histograms exist.
metrics()->RecordCheckedWordStats(string16(ASCIIToUTF16("test")), false);
RecordWordCountsForTesting();
// Get baselines for all affected histograms.
scoped_ptr<HistogramSamples> baselines[arraysize(histogramName)];
for (size_t i = 0; i < arraysize(histogramName); ++i) {
Histogram* histogram =
StatisticsRecorder::FindHistogram(histogramName[i]);
if (histogram)
baselines[i] = histogram->SnapshotSamples();
}
// Nothing changed, so this invocation should not affect any histograms.
RecordWordCountsForTesting();
// Get samples for all affected histograms.
scoped_ptr<HistogramSamples> samples[arraysize(histogramName)];
for (size_t i = 0; i < arraysize(histogramName); ++i) {
Histogram* histogram =
StatisticsRecorder::FindHistogram(histogramName[i]);
ASSERT_TRUE(histogram != NULL);
samples[i] = histogram->SnapshotSamples();
if (baselines[i].get())
samples[i]->Subtract(*baselines[i]);
EXPECT_EQ(0, samples[i]->TotalCount());
}
}
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