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// Copyright 2013 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 "base/metrics/histogram_delta_serialization.h"
#include <vector>
#include "base/metrics/histogram.h"
#include "base/metrics/histogram_base.h"
#include "base/metrics/statistics_recorder.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
TEST(HistogramDeltaSerializationTest, DeserializeHistogramAndAddSamples) {
StatisticsRecorder statistic_recorder;
HistogramDeltaSerialization serializer("HistogramDeltaSerializationTest");
std::vector<std::string> deltas;
// Nothing was changed yet.
serializer.PrepareAndSerializeDeltas(&deltas, true);
EXPECT_TRUE(deltas.empty());
HistogramBase* histogram = Histogram::FactoryGet(
"TestHistogram", 1, 1000, 10, HistogramBase::kIPCSerializationSourceFlag);
histogram->Add(1);
histogram->Add(10);
histogram->Add(100);
histogram->Add(1000);
serializer.PrepareAndSerializeDeltas(&deltas, true);
EXPECT_FALSE(deltas.empty());
HistogramDeltaSerialization::DeserializeAndAddSamples(deltas);
// The histogram has kIPCSerializationSourceFlag. So samples will be ignored.
std::unique_ptr<HistogramSamples> snapshot(histogram->SnapshotSamples());
EXPECT_EQ(1, snapshot->GetCount(1));
EXPECT_EQ(1, snapshot->GetCount(10));
EXPECT_EQ(1, snapshot->GetCount(100));
EXPECT_EQ(1, snapshot->GetCount(1000));
// Clear kIPCSerializationSourceFlag to emulate multi-process usage.
histogram->ClearFlags(HistogramBase::kIPCSerializationSourceFlag);
HistogramDeltaSerialization::DeserializeAndAddSamples(deltas);
std::unique_ptr<HistogramSamples> snapshot2(histogram->SnapshotSamples());
EXPECT_EQ(2, snapshot2->GetCount(1));
EXPECT_EQ(2, snapshot2->GetCount(10));
EXPECT_EQ(2, snapshot2->GetCount(100));
EXPECT_EQ(2, snapshot2->GetCount(1000));
}
} // namespace base
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