1// Copyright 2013 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 "content/browser/download/rate_estimator.h"
6
7#include "testing/gtest/include/gtest/gtest.h"
8
9using base::TimeDelta;
10
11namespace content {
12
13TEST(RateEstimatorTest, RateEstimator) {
14  base::TimeTicks now;
15  RateEstimator estimator(TimeDelta::FromSeconds(1), 10u, now);
16  EXPECT_EQ(0u, estimator.GetCountPerSecond(now));
17
18  estimator.Increment(50u, now);
19  EXPECT_EQ(50u, estimator.GetCountPerSecond(now));
20
21  now += TimeDelta::FromMilliseconds(800);
22  estimator.Increment(50, now);
23  EXPECT_EQ(100u, estimator.GetCountPerSecond(now));
24
25  // Advance time.
26  now += TimeDelta::FromSeconds(3);
27  EXPECT_EQ(25u, estimator.GetCountPerSecond(now));
28  estimator.Increment(60, now);
29  EXPECT_EQ(40u, estimator.GetCountPerSecond(now));
30
31  // Advance time again.
32  now += TimeDelta::FromSeconds(4);
33  EXPECT_EQ(20u, estimator.GetCountPerSecond(now));
34
35  // Advance time to the end.
36  now += TimeDelta::FromSeconds(2);
37  EXPECT_EQ(16u, estimator.GetCountPerSecond(now));
38  estimator.Increment(100, now);
39  EXPECT_EQ(26u, estimator.GetCountPerSecond(now));
40
41  // Now wrap around to the start.
42  now += TimeDelta::FromSeconds(1);
43  EXPECT_EQ(16u, estimator.GetCountPerSecond(now));
44  estimator.Increment(100, now);
45  EXPECT_EQ(26u, estimator.GetCountPerSecond(now));
46
47  // Advance far into the future.
48  now += TimeDelta::FromSeconds(40);
49  EXPECT_EQ(0u, estimator.GetCountPerSecond(now));
50  estimator.Increment(100, now);
51  EXPECT_EQ(100u, estimator.GetCountPerSecond(now));
52
53  // Pretend that there is timeticks wrap around.
54  now = base::TimeTicks();
55  EXPECT_EQ(0u, estimator.GetCountPerSecond(now));
56}
57
58}  // namespace content
59