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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 <string>
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/histogram_samples.h"
#include "base/metrics/sample_map.h"
#include "base/metrics/sparse_histogram.h"
#include "base/metrics/statistics_recorder.h"
#include "base/pickle.h"
#include "base/strings/stringprintf.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
class SparseHistogramTest : public testing::Test {
protected:
void SetUp() override {
// Each test will have a clean state (no Histogram / BucketRanges
// registered).
InitializeStatisticsRecorder();
}
void TearDown() override { UninitializeStatisticsRecorder(); }
void InitializeStatisticsRecorder() {
statistics_recorder_ = new StatisticsRecorder();
}
void UninitializeStatisticsRecorder() {
delete statistics_recorder_;
statistics_recorder_ = NULL;
}
scoped_ptr<SparseHistogram> NewSparseHistogram(const std::string& name) {
return scoped_ptr<SparseHistogram>(new SparseHistogram(name));
}
StatisticsRecorder* statistics_recorder_;
};
TEST_F(SparseHistogramTest, BasicTest) {
scoped_ptr<SparseHistogram> histogram(NewSparseHistogram("Sparse"));
scoped_ptr<HistogramSamples> snapshot(histogram->SnapshotSamples());
EXPECT_EQ(0, snapshot->TotalCount());
EXPECT_EQ(0, snapshot->sum());
histogram->Add(100);
scoped_ptr<HistogramSamples> snapshot1(histogram->SnapshotSamples());
EXPECT_EQ(1, snapshot1->TotalCount());
EXPECT_EQ(1, snapshot1->GetCount(100));
histogram->Add(100);
histogram->Add(101);
scoped_ptr<HistogramSamples> snapshot2(histogram->SnapshotSamples());
EXPECT_EQ(3, snapshot2->TotalCount());
EXPECT_EQ(2, snapshot2->GetCount(100));
EXPECT_EQ(1, snapshot2->GetCount(101));
}
TEST_F(SparseHistogramTest, MacroBasicTest) {
UMA_HISTOGRAM_SPARSE_SLOWLY("Sparse", 100);
UMA_HISTOGRAM_SPARSE_SLOWLY("Sparse", 200);
UMA_HISTOGRAM_SPARSE_SLOWLY("Sparse", 100);
StatisticsRecorder::Histograms histograms;
StatisticsRecorder::GetHistograms(&histograms);
ASSERT_EQ(1U, histograms.size());
HistogramBase* sparse_histogram = histograms[0];
EXPECT_EQ(SPARSE_HISTOGRAM, sparse_histogram->GetHistogramType());
EXPECT_EQ("Sparse", sparse_histogram->histogram_name());
EXPECT_EQ(HistogramBase::kUmaTargetedHistogramFlag,
sparse_histogram->flags());
scoped_ptr<HistogramSamples> samples = sparse_histogram->SnapshotSamples();
EXPECT_EQ(3, samples->TotalCount());
EXPECT_EQ(2, samples->GetCount(100));
EXPECT_EQ(1, samples->GetCount(200));
}
TEST_F(SparseHistogramTest, MacroInLoopTest) {
// Unlike the macros in histogram.h, SparseHistogram macros can have a
// variable as histogram name.
for (int i = 0; i < 2; i++) {
std::string name = StringPrintf("Sparse%d", i + 1);
UMA_HISTOGRAM_SPARSE_SLOWLY(name, 100);
}
StatisticsRecorder::Histograms histograms;
StatisticsRecorder::GetHistograms(&histograms);
ASSERT_EQ(2U, histograms.size());
std::string name1 = histograms[0]->histogram_name();
std::string name2 = histograms[1]->histogram_name();
EXPECT_TRUE(("Sparse1" == name1 && "Sparse2" == name2) ||
("Sparse2" == name1 && "Sparse1" == name2));
}
TEST_F(SparseHistogramTest, Serialize) {
scoped_ptr<SparseHistogram> histogram(NewSparseHistogram("Sparse"));
histogram->SetFlags(HistogramBase::kIPCSerializationSourceFlag);
Pickle pickle;
histogram->SerializeInfo(&pickle);
PickleIterator iter(pickle);
int type;
EXPECT_TRUE(iter.ReadInt(&type));
EXPECT_EQ(SPARSE_HISTOGRAM, type);
std::string name;
EXPECT_TRUE(iter.ReadString(&name));
EXPECT_EQ("Sparse", name);
int flag;
EXPECT_TRUE(iter.ReadInt(&flag));
EXPECT_EQ(HistogramBase::kIPCSerializationSourceFlag, flag);
// No more data in the pickle.
EXPECT_FALSE(iter.SkipBytes(1));
}
} // namespace base
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