1 /*
2 * Copyright (c) 2019 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 #include "modules/video_coding/unique_timestamp_counter.h"
11
12 #include "test/gtest.h"
13
14 namespace webrtc {
15 namespace {
16
TEST(UniqueTimestampCounterTest,InitiallyZero)17 TEST(UniqueTimestampCounterTest, InitiallyZero) {
18 UniqueTimestampCounter counter;
19 EXPECT_EQ(counter.GetUniqueSeen(), 0);
20 }
21
TEST(UniqueTimestampCounterTest,CountsUniqueValues)22 TEST(UniqueTimestampCounterTest, CountsUniqueValues) {
23 UniqueTimestampCounter counter;
24 counter.Add(100);
25 counter.Add(100);
26 counter.Add(200);
27 counter.Add(150);
28 counter.Add(100);
29 EXPECT_EQ(counter.GetUniqueSeen(), 3);
30 }
31
TEST(UniqueTimestampCounterTest,ForgetsOldValuesAfter1000NewValues)32 TEST(UniqueTimestampCounterTest, ForgetsOldValuesAfter1000NewValues) {
33 const int kNumValues = 1500;
34 const int kMaxHistory = 1000;
35 const uint32_t value = 0xFFFFFFF0;
36 UniqueTimestampCounter counter;
37 for (int i = 0; i < kNumValues; ++i) {
38 counter.Add(value + 10 * i);
39 }
40 ASSERT_EQ(counter.GetUniqueSeen(), kNumValues);
41 // Slightly old values not affect number of seen unique values.
42 for (int i = kNumValues - kMaxHistory; i < kNumValues; ++i) {
43 counter.Add(value + 10 * i);
44 }
45 EXPECT_EQ(counter.GetUniqueSeen(), kNumValues);
46 // Very old value will be treated as unique.
47 counter.Add(value);
48 EXPECT_EQ(counter.GetUniqueSeen(), kNumValues + 1);
49 }
50
51 } // namespace
52 } // namespace webrtc
53