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// 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/time.h"
#include "media/base/moving_average.h"
#include "testing/gtest/include/gtest/gtest.h"
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());
}
TEST(MovingAverageTest, MinAndMax) {
MovingAverage moving_average(5);
base::TimeDelta min = base::TimeDelta::FromSeconds(1);
base::TimeDelta med = base::TimeDelta::FromSeconds(50);
base::TimeDelta max = base::TimeDelta::FromSeconds(100);
moving_average.AddSample(min);
moving_average.AddSample(med);
moving_average.AddSample(med);
moving_average.AddSample(med);
moving_average.AddSample(max);
auto extremes = moving_average.GetMinAndMax();
EXPECT_EQ(extremes.first, min);
EXPECT_EQ(extremes.second, max);
}
} // namespace media
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