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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/sample_map.h"
#include "base/metrics/sparse_histogram.h"
#include "base/pickle.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
class SparseHistogramTest : public testing::Test {
protected:
scoped_ptr<SparseHistogram> NewSparseHistogram(const std::string& name) {
return scoped_ptr<SparseHistogram>(new SparseHistogram(name));
}
};
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, 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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