chrome/browser/chromeos/external_metrics_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 "base/files/file_util.h"
   6 #include "base/files/scoped_temp_dir.h"
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/metrics/statistics_recorder.h"
   9 #include "base/test/histogram_tester.h"
  10 #include "chrome/browser/chromeos/external_metrics.h"
  11 #include "components/metrics/serialization/metric_sample.h"
  12 #include "components/metrics/serialization/serialization_utils.h"
  13 #include "content/public/test/test_browser_thread_bundle.h"
  14 #include "testing/gtest/include/gtest/gtest.h"
  15
  16 namespace chromeos {  // Need this because of the FRIEND_TEST
  17
  18 class ExternalMetricsTest : public testing::Test {
  19  public:
  20   void SetUp() override {
  21     ASSERT_TRUE(dir_.CreateUniqueTempDir());
  22     external_metrics_ = ExternalMetrics::CreateForTesting(
  23         dir_.path().Append("testfile").value());
  24   }
  25
  26   base::ScopedTempDir dir_;
  27   scoped_refptr<ExternalMetrics> external_metrics_;
  28   content::TestBrowserThreadBundle thread_bundle_;
  29 };
  30
  31 TEST_F(ExternalMetricsTest, HandleMissingFile) {
  32   ASSERT_TRUE(base::DeleteFile(
  33       base::FilePath(external_metrics_->uma_events_file_), false));
  34
  35   EXPECT_EQ(0, external_metrics_->CollectEvents());
  36 }
  37
  38 TEST_F(ExternalMetricsTest, CanReceiveHistogram) {
  39   base::HistogramTester histogram_tester;
  40
  41   scoped_ptr<metrics::MetricSample> hist =
  42       metrics::MetricSample::HistogramSample("foo", 2, 1, 100, 10);
  43
  44   EXPECT_TRUE(metrics::SerializationUtils::WriteMetricToFile(
  45       *hist.get(), external_metrics_->uma_events_file_));
  46
  47   EXPECT_EQ(1, external_metrics_->CollectEvents());
  48
  49   histogram_tester.ExpectTotalCount("foo", 1);
  50 }
  51
  52 TEST_F(ExternalMetricsTest, IncorrectHistogramsAreDiscarded) {
  53   base::HistogramTester histogram_tester;
  54
  55   // Malformed histogram (min > max).
  56   scoped_ptr<metrics::MetricSample> hist =
  57       metrics::MetricSample::HistogramSample("bar", 30, 200, 20, 10);
  58
  59   EXPECT_TRUE(metrics::SerializationUtils::WriteMetricToFile(
  60       *hist.get(), external_metrics_->uma_events_file_));
  61
  62   external_metrics_->CollectEvents();
  63
  64   histogram_tester.ExpectTotalCount("bar", 0);
  65 }
  66
  67 }  // namespace chromeos