henrike@webrtc.org | f7795df | 2014-05-13 18:00:26 +0000 | [diff] [blame^] | 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 | |
| 14 | namespace rtc { |
| 15 | |
| 16 | class 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 | |
| 26 | TEST(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 |