1 /*
2 * Copyright 2018 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 "rtc_base/numerics/sample_counter.h"
12
13 #include <initializer_list>
14
15 #include "test/gmock.h"
16 #include "test/gtest.h"
17
18 using ::testing::Eq;
19
20 namespace rtc {
21
TEST(SampleCounterTest,ProcessesNoSamples)22 TEST(SampleCounterTest, ProcessesNoSamples) {
23 constexpr int kMinSamples = 1;
24 SampleCounter counter;
25 EXPECT_THAT(counter.Avg(kMinSamples), Eq(absl::nullopt));
26 EXPECT_THAT(counter.Max(), Eq(absl::nullopt));
27 }
28
TEST(SampleCounterTest,NotEnoughSamples)29 TEST(SampleCounterTest, NotEnoughSamples) {
30 constexpr int kMinSamples = 6;
31 SampleCounter counter;
32 for (int value : {1, 2, 3, 4, 5}) {
33 counter.Add(value);
34 }
35 EXPECT_THAT(counter.Avg(kMinSamples), Eq(absl::nullopt));
36 EXPECT_THAT(counter.Sum(kMinSamples), Eq(absl::nullopt));
37 EXPECT_THAT(counter.Max(), Eq(5));
38 }
39
TEST(SampleCounterTest,EnoughSamples)40 TEST(SampleCounterTest, EnoughSamples) {
41 constexpr int kMinSamples = 5;
42 SampleCounter counter;
43 for (int value : {1, 2, 3, 4, 5}) {
44 counter.Add(value);
45 }
46 EXPECT_THAT(counter.Avg(kMinSamples), Eq(3));
47 EXPECT_THAT(counter.Sum(kMinSamples), Eq(15));
48 EXPECT_THAT(counter.Max(), Eq(5));
49 }
50
TEST(SampleCounterTest,ComputesVariance)51 TEST(SampleCounterTest, ComputesVariance) {
52 constexpr int kMinSamples = 5;
53 SampleCounterWithVariance counter;
54 for (int value : {1, 2, 3, 4, 5}) {
55 counter.Add(value);
56 }
57 EXPECT_THAT(counter.Variance(kMinSamples), Eq(2));
58 }
59
TEST(SampleCounterTest,AggregatesTwoCounters)60 TEST(SampleCounterTest, AggregatesTwoCounters) {
61 constexpr int kMinSamples = 5;
62 SampleCounterWithVariance counter1;
63 for (int value : {1, 2, 3}) {
64 counter1.Add(value);
65 }
66 SampleCounterWithVariance counter2;
67 for (int value : {4, 5}) {
68 counter2.Add(value);
69 }
70 // Before aggregation there is not enough samples.
71 EXPECT_THAT(counter1.Avg(kMinSamples), Eq(absl::nullopt));
72 EXPECT_THAT(counter1.Variance(kMinSamples), Eq(absl::nullopt));
73 // Aggregate counter2 in counter1.
74 counter1.Add(counter2);
75 EXPECT_THAT(counter1.Avg(kMinSamples), Eq(3));
76 EXPECT_THAT(counter1.Max(), Eq(5));
77 EXPECT_THAT(counter1.Variance(kMinSamples), Eq(2));
78 }
79
80 } // namespace rtc
81