1/*
2 *  Copyright 2010 The WebRTC Project Authors. All rights reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include "webrtc/base/gunit.h"
12#include "webrtc/base/ratetracker.h"
13
14namespace rtc {
15
16class RateTrackerForTest : public RateTracker {
17 public:
18  RateTrackerForTest() : time_(0) {}
19  virtual uint32 Time() const { return time_; }
20  void AdvanceTime(uint32 delta) { time_ += delta; }
21
22 private:
23  uint32 time_;
24};
25
26TEST(RateTrackerTest, TestBasics) {
27  RateTrackerForTest tracker;
28  EXPECT_EQ(0U, tracker.total_units());
29  EXPECT_EQ(0U, tracker.units_second());
30
31  // Add a sample.
32  tracker.Update(1234);
33  // Advance the clock by 100 ms.
34  tracker.AdvanceTime(100);
35  // total_units should advance, but units_second should stay 0.
36  EXPECT_EQ(1234U, tracker.total_units());
37  EXPECT_EQ(0U, tracker.units_second());
38
39  // Repeat.
40  tracker.Update(1234);
41  tracker.AdvanceTime(100);
42  EXPECT_EQ(1234U * 2, tracker.total_units());
43  EXPECT_EQ(0U, tracker.units_second());
44
45  // Advance the clock by 800 ms, so we've elapsed a full second.
46  // units_second should now be filled in properly.
47  tracker.AdvanceTime(800);
48  EXPECT_EQ(1234U * 2, tracker.total_units());
49  EXPECT_EQ(1234U * 2, tracker.units_second());
50
51  // Poll the tracker again immediately. The reported rate should stay the same.
52  EXPECT_EQ(1234U * 2, tracker.total_units());
53  EXPECT_EQ(1234U * 2, tracker.units_second());
54
55  // Do nothing and advance by a second. We should drop down to zero.
56  tracker.AdvanceTime(1000);
57  EXPECT_EQ(1234U * 2, tracker.total_units());
58  EXPECT_EQ(0U, tracker.units_second());
59
60  // Send a bunch of data at a constant rate for 5.5 "seconds".
61  // We should report the rate properly.
62  for (int i = 0; i < 5500; i += 100) {
63    tracker.Update(9876U);
64    tracker.AdvanceTime(100);
65  }
66  EXPECT_EQ(9876U * 10, tracker.units_second());
67
68  // Advance the clock by 500 ms. Since we sent nothing over this half-second,
69  // the reported rate should be reduced by half.
70  tracker.AdvanceTime(500);
71  EXPECT_EQ(9876U * 5, tracker.units_second());
72}
73
74}  // namespace rtc
75