| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/time.h" |
| #include "cobalt/media/base/moving_average.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace cobalt { |
| namespace media { |
| |
| TEST(MovingAverageTest, AverageAndDeviation) { |
| const int kSamples = 5; |
| MovingAverage moving_average(kSamples); |
| moving_average.AddSample(base::TimeDelta::FromSeconds(1)); |
| EXPECT_EQ(base::TimeDelta::FromSeconds(1), moving_average.Average()); |
| EXPECT_EQ(base::TimeDelta(), moving_average.Deviation()); |
| |
| for (int i = 0; i < kSamples - 1; ++i) |
| moving_average.AddSample(base::TimeDelta::FromSeconds(1)); |
| EXPECT_EQ(base::TimeDelta::FromSeconds(1), moving_average.Average()); |
| EXPECT_EQ(base::TimeDelta(), moving_average.Deviation()); |
| |
| base::TimeDelta expect_deviation[] = { |
| base::TimeDelta::FromMicroseconds(200000), |
| base::TimeDelta::FromMicroseconds(244948), |
| base::TimeDelta::FromMicroseconds(244948), |
| base::TimeDelta::FromMicroseconds(200000), |
| base::TimeDelta::FromMilliseconds(0), |
| }; |
| for (int i = 0; i < kSamples; ++i) { |
| moving_average.AddSample(base::TimeDelta::FromMilliseconds(500)); |
| EXPECT_EQ(base::TimeDelta::FromMilliseconds(1000 - (i + 1) * 100), |
| moving_average.Average()); |
| EXPECT_EQ(expect_deviation[i], moving_average.Deviation()); |
| } |
| } |
| |
| TEST(MovingAverageTest, Reset) { |
| MovingAverage moving_average(2); |
| moving_average.AddSample(base::TimeDelta::FromSeconds(1)); |
| EXPECT_EQ(base::TimeDelta::FromSeconds(1), moving_average.Average()); |
| moving_average.Reset(); |
| moving_average.AddSample(base::TimeDelta()); |
| EXPECT_EQ(base::TimeDelta(), moving_average.Average()); |
| EXPECT_EQ(base::TimeDelta(), moving_average.Deviation()); |
| } |
| |
| } // namespace media |
| } // namespace cobalt |