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
15namespace chromeos {  // Need this because of the FRIEND_TEST
16
17class 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
30TEST_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
37TEST_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
51TEST_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