base/metrics/sparse_histogram_unittest.cc

   1 // Copyright (c) 2012 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 <string>
   6
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/metrics/histogram_base.h"
   9 #include "base/metrics/histogram_samples.h"
  10 #include "base/metrics/sample_map.h"
  11 #include "base/metrics/sparse_histogram.h"
  12 #include "base/metrics/statistics_recorder.h"
  13 #include "base/pickle.h"
  14 #include "base/strings/stringprintf.h"
  15 #include "testing/gtest/include/gtest/gtest.h"
  16
  17 namespace base {
  18
  19 class SparseHistogramTest : public testing::Test {
  20  protected:
  21   virtual void SetUp() {
  22     // Each test will have a clean state (no Histogram / BucketRanges
  23     // registered).
  24     InitializeStatisticsRecorder();
  25   }
  26
  27   virtual void TearDown() {
  28     UninitializeStatisticsRecorder();
  29   }
  30
  31   void InitializeStatisticsRecorder() {
  32     statistics_recorder_ = new StatisticsRecorder();
  33   }
  34
  35   void UninitializeStatisticsRecorder() {
  36     delete statistics_recorder_;
  37     statistics_recorder_ = NULL;
  38   }
  39
  40   scoped_ptr<SparseHistogram> NewSparseHistogram(const std::string& name) {
  41     return scoped_ptr<SparseHistogram>(new SparseHistogram(name));
  42   }
  43
  44   StatisticsRecorder* statistics_recorder_;
  45 };
  46
  47 TEST_F(SparseHistogramTest, BasicTest) {
  48   scoped_ptr<SparseHistogram> histogram(NewSparseHistogram("Sparse"));
  49   scoped_ptr<HistogramSamples> snapshot(histogram->SnapshotSamples());
  50   EXPECT_EQ(0, snapshot->TotalCount());
  51   EXPECT_EQ(0, snapshot->sum());
  52
  53   histogram->Add(100);
  54   scoped_ptr<HistogramSamples> snapshot1(histogram->SnapshotSamples());
  55   EXPECT_EQ(1, snapshot1->TotalCount());
  56   EXPECT_EQ(1, snapshot1->GetCount(100));
  57
  58   histogram->Add(100);
  59   histogram->Add(101);
  60   scoped_ptr<HistogramSamples> snapshot2(histogram->SnapshotSamples());
  61   EXPECT_EQ(3, snapshot2->TotalCount());
  62   EXPECT_EQ(2, snapshot2->GetCount(100));
  63   EXPECT_EQ(1, snapshot2->GetCount(101));
  64 }
  65
  66 TEST_F(SparseHistogramTest, MacroBasicTest) {
  67   UMA_HISTOGRAM_SPARSE_SLOWLY("Sparse", 100);
  68   UMA_HISTOGRAM_SPARSE_SLOWLY("Sparse", 200);
  69   UMA_HISTOGRAM_SPARSE_SLOWLY("Sparse", 100);
  70
  71   StatisticsRecorder::Histograms histograms;
  72   StatisticsRecorder::GetHistograms(&histograms);
  73
  74   ASSERT_EQ(1U, histograms.size());
  75   HistogramBase* sparse_histogram = histograms[0];
  76
  77   EXPECT_EQ(SPARSE_HISTOGRAM, sparse_histogram->GetHistogramType());
  78   EXPECT_EQ("Sparse", sparse_histogram->histogram_name());
  79   EXPECT_EQ(HistogramBase::kUmaTargetedHistogramFlag,
  80             sparse_histogram->flags());
  81
  82   scoped_ptr<HistogramSamples> samples = sparse_histogram->SnapshotSamples();
  83   EXPECT_EQ(3, samples->TotalCount());
  84   EXPECT_EQ(2, samples->GetCount(100));
  85   EXPECT_EQ(1, samples->GetCount(200));
  86 }
  87
  88 TEST_F(SparseHistogramTest, MacroInLoopTest) {
  89   // Unlike the macros in histogram.h, SparseHistogram macros can have a
  90   // variable as histogram name.
  91   for (int i = 0; i < 2; i++) {
  92     std::string name = StringPrintf("Sparse%d", i + 1);
  93     UMA_HISTOGRAM_SPARSE_SLOWLY(name, 100);
  94   }
  95
  96   StatisticsRecorder::Histograms histograms;
  97   StatisticsRecorder::GetHistograms(&histograms);
  98   ASSERT_EQ(2U, histograms.size());
  99
 100   std::string name1 = histograms[0]->histogram_name();
 101   std::string name2 = histograms[1]->histogram_name();
 102   EXPECT_TRUE(("Sparse1" == name1 && "Sparse2" == name2) ||
 103               ("Sparse2" == name1 && "Sparse1" == name2));
 104 }
 105
 106 TEST_F(SparseHistogramTest, Serialize) {
 107   scoped_ptr<SparseHistogram> histogram(NewSparseHistogram("Sparse"));
 108   histogram->SetFlags(HistogramBase::kIPCSerializationSourceFlag);
 109
 110   Pickle pickle;
 111   histogram->SerializeInfo(&pickle);
 112
 113   PickleIterator iter(pickle);
 114
 115   int type;
 116   EXPECT_TRUE(iter.ReadInt(&type));
 117   EXPECT_EQ(SPARSE_HISTOGRAM, type);
 118
 119   std::string name;
 120   EXPECT_TRUE(iter.ReadString(&name));
 121   EXPECT_EQ("Sparse", name);
 122
 123   int flag;
 124   EXPECT_TRUE(iter.ReadInt(&flag));
 125   EXPECT_EQ(HistogramBase::kIPCSerializationSourceFlag, flag);
 126
 127   // No more data in the pickle.
 128   EXPECT_FALSE(iter.SkipBytes(1));
 129 }
 130
 131 }  // namespace base