components/cronet/histogram_manager_unittest.cc

   1 // Copyright 2014 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 "components/cronet/histogram_manager.h"
   6
   7 #include <string>
   8
   9 #include "base/basictypes.h"
  10 #include "base/metrics/statistics_recorder.h"
  11 #include "testing/gtest/include/gtest/gtest.h"
  12
  13 namespace cronet {
  14
  15 using metrics::ChromeUserMetricsExtension;
  16 using metrics::HistogramEventProto;
  17
  18 TEST(HistogramManager, HistogramBucketFields) {
  19   base::StatisticsRecorder::Initialize();
  20   // Capture histograms at the start of the test to avoid later GetDeltas()
  21   // calls picking them up.
  22   std::vector<uint8> data_init;
  23   HistogramManager::GetInstance()->GetDeltas(&data_init);
  24
  25   // kNoFlags filter should record all histograms.
  26   UMA_HISTOGRAM_ENUMERATION("UmaHistogramManager", 1, 2);
  27
  28   std::vector<uint8> data;
  29   EXPECT_TRUE(HistogramManager::GetInstance()->GetDeltas(&data));
  30   EXPECT_FALSE(data.empty());
  31   ChromeUserMetricsExtension uma_proto;
  32   EXPECT_TRUE(uma_proto.ParseFromArray(
  33       reinterpret_cast<const char*>(&data[0]), data.size()));
  34   EXPECT_FALSE(data.empty());
  35
  36   const HistogramEventProto& histogram_proto =
  37       uma_proto.histogram_event(uma_proto.histogram_event_size() - 1);
  38   ASSERT_EQ(1, histogram_proto.bucket_size());
  39   EXPECT_LE(0, histogram_proto.bucket(0).min());
  40   EXPECT_LE(2, histogram_proto.bucket(0).max());
  41   EXPECT_EQ(1, histogram_proto.bucket(0).count());
  42
  43   UMA_HISTOGRAM_ENUMERATION("UmaHistogramManager2", 2, 3);
  44   std::vector<uint8> data2;
  45   EXPECT_TRUE(HistogramManager::GetInstance()->GetDeltas(&data2));
  46   EXPECT_FALSE(data2.empty());
  47   ChromeUserMetricsExtension uma_proto2;
  48   EXPECT_TRUE(uma_proto2.ParseFromArray(
  49       reinterpret_cast<const char*>(&data2[0]), data2.size()));
  50   EXPECT_FALSE(data2.empty());
  51
  52   const HistogramEventProto& histogram_proto2 =
  53       uma_proto2.histogram_event(uma_proto2.histogram_event_size() - 1);
  54   ASSERT_EQ(1, histogram_proto2.bucket_size());
  55   EXPECT_LE(0, histogram_proto2.bucket(0).min());
  56   EXPECT_LE(3, histogram_proto2.bucket(0).max());
  57   EXPECT_EQ(1, histogram_proto2.bucket(0).count());
  58 }
  59
  60 }  // namespace cronet