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1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "base/metrics/histogram_delta_serialization.h"
6 
7 #include <vector>
8 
9 #include "base/metrics/histogram.h"
10 #include "base/metrics/histogram_base.h"
11 #include "base/metrics/statistics_recorder.h"
12 #include "testing/gtest/include/gtest/gtest.h"
13 
14 namespace base {
15 
TEST(HistogramDeltaSerializationTest,DeserializeHistogramAndAddSamples)16 TEST(HistogramDeltaSerializationTest, DeserializeHistogramAndAddSamples) {
17   std::unique_ptr<StatisticsRecorder> statistic_recorder(
18       StatisticsRecorder::CreateTemporaryForTesting());
19   HistogramDeltaSerialization serializer("HistogramDeltaSerializationTest");
20   std::vector<std::string> deltas;
21   // Nothing was changed yet.
22   serializer.PrepareAndSerializeDeltas(&deltas, true);
23   EXPECT_TRUE(deltas.empty());
24 
25   HistogramBase* histogram = Histogram::FactoryGet(
26       "TestHistogram", 1, 1000, 10, HistogramBase::kIPCSerializationSourceFlag);
27   histogram->Add(1);
28   histogram->Add(10);
29   histogram->Add(100);
30   histogram->Add(1000);
31 
32   serializer.PrepareAndSerializeDeltas(&deltas, true);
33   EXPECT_FALSE(deltas.empty());
34 
35   HistogramDeltaSerialization::DeserializeAndAddSamples(deltas);
36 
37   // The histogram has kIPCSerializationSourceFlag. So samples will be ignored.
38   std::unique_ptr<HistogramSamples> snapshot(histogram->SnapshotSamples());
39   EXPECT_EQ(1, snapshot->GetCount(1));
40   EXPECT_EQ(1, snapshot->GetCount(10));
41   EXPECT_EQ(1, snapshot->GetCount(100));
42   EXPECT_EQ(1, snapshot->GetCount(1000));
43 
44   // Clear kIPCSerializationSourceFlag to emulate multi-process usage.
45   histogram->ClearFlags(HistogramBase::kIPCSerializationSourceFlag);
46   HistogramDeltaSerialization::DeserializeAndAddSamples(deltas);
47 
48   std::unique_ptr<HistogramSamples> snapshot2(histogram->SnapshotSamples());
49   EXPECT_EQ(2, snapshot2->GetCount(1));
50   EXPECT_EQ(2, snapshot2->GetCount(10));
51   EXPECT_EQ(2, snapshot2->GetCount(100));
52   EXPECT_EQ(2, snapshot2->GetCount(1000));
53 }
54 
55 }  // namespace base
56