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