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56 lines
2.0 KiB
56 lines
2.0 KiB
4 months ago
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// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/metrics/histogram_delta_serialization.h"
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#include <vector>
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#include "base/metrics/histogram.h"
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#include "base/metrics/histogram_base.h"
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#include "base/metrics/statistics_recorder.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace base {
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TEST(HistogramDeltaSerializationTest, DeserializeHistogramAndAddSamples) {
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std::unique_ptr<StatisticsRecorder> statistic_recorder(
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StatisticsRecorder::CreateTemporaryForTesting());
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HistogramDeltaSerialization serializer("HistogramDeltaSerializationTest");
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std::vector<std::string> deltas;
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// Nothing was changed yet.
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serializer.PrepareAndSerializeDeltas(&deltas, true);
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EXPECT_TRUE(deltas.empty());
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HistogramBase* histogram = Histogram::FactoryGet(
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"TestHistogram", 1, 1000, 10, HistogramBase::kIPCSerializationSourceFlag);
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histogram->Add(1);
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histogram->Add(10);
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histogram->Add(100);
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histogram->Add(1000);
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serializer.PrepareAndSerializeDeltas(&deltas, true);
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EXPECT_FALSE(deltas.empty());
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HistogramDeltaSerialization::DeserializeAndAddSamples(deltas);
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// The histogram has kIPCSerializationSourceFlag. So samples will be ignored.
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std::unique_ptr<HistogramSamples> snapshot(histogram->SnapshotSamples());
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EXPECT_EQ(1, snapshot->GetCount(1));
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EXPECT_EQ(1, snapshot->GetCount(10));
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EXPECT_EQ(1, snapshot->GetCount(100));
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EXPECT_EQ(1, snapshot->GetCount(1000));
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// Clear kIPCSerializationSourceFlag to emulate multi-process usage.
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histogram->ClearFlags(HistogramBase::kIPCSerializationSourceFlag);
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HistogramDeltaSerialization::DeserializeAndAddSamples(deltas);
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std::unique_ptr<HistogramSamples> snapshot2(histogram->SnapshotSamples());
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EXPECT_EQ(2, snapshot2->GetCount(1));
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EXPECT_EQ(2, snapshot2->GetCount(10));
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EXPECT_EQ(2, snapshot2->GetCount(100));
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EXPECT_EQ(2, snapshot2->GetCount(1000));
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}
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} // namespace base
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