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      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
    132