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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/performance_manager/persistence/site_data/exponential_moving_average.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace performance_manager {
TEST(ExponentialMovingAverageTest, AppendDatum) {
ExponentialMovingAverage avg(0.5);
EXPECT_EQ(0.5, avg.alpha());
EXPECT_EQ(0u, avg.num_datums());
EXPECT_EQ(0.0, avg.value());
avg.AppendDatum(10.0);
EXPECT_EQ(1u, avg.num_datums());
EXPECT_EQ(10.0, avg.value());
avg.AppendDatum(5.0);
EXPECT_EQ(2u, avg.num_datums());
EXPECT_EQ(7.5, avg.value());
avg.AppendDatum(2.0);
EXPECT_EQ(3u, avg.num_datums());
EXPECT_EQ(4.75, avg.value());
}
TEST(ExponentialMovingAverageTest, PrependDatum) {
ExponentialMovingAverage avg(0.5);
EXPECT_EQ(0u, avg.num_datums());
avg.PrependDatum(2.0);
EXPECT_EQ(1u, avg.num_datums());
EXPECT_EQ(2.0, avg.value());
avg.PrependDatum(5.0);
EXPECT_EQ(2u, avg.num_datums());
EXPECT_EQ(3.5, avg.value());
avg.PrependDatum(10.0);
EXPECT_EQ(3u, avg.num_datums());
EXPECT_EQ(4.75, avg.value());
}
TEST(ExponentialMovingAverageTest, ContinueFromPreviousSession) {
ExponentialMovingAverage avg1(0.75);
avg1.AppendDatum(10.0);
avg1.AppendDatum(5.0);
avg1.AppendDatum(3.5);
// Get the value of the moving average to this point.
float start_avg = avg1.value();
// Create a new moving average and add some samples to both.
ExponentialMovingAverage avg2(0.75);
avg1.AppendDatum(9.25);
avg2.AppendDatum(9.25);
avg1.AppendDatum(3.33);
avg2.AppendDatum(3.33);
EXPECT_NE(avg1.value(), avg2.value());
// Now prepend the start value of the first histogram to the second one,
// which should bring them into line.
avg2.PrependDatum(start_avg);
EXPECT_EQ(avg1.value(), avg2.value());
}
TEST(ExponentialMovingAverageTest, Clear) {
ExponentialMovingAverage avg(0.25);
EXPECT_EQ(0.25, avg.alpha());
avg.AppendDatum(5.25);
avg.AppendDatum(3.25);
avg.PrependDatum(2.25);
float old_value = avg.value();
EXPECT_NE(0.0, old_value);
EXPECT_NE(0u, avg.num_datums());
// Clear it, and make sure it's reset proper.
avg.Clear();
EXPECT_EQ(0.0, avg.value());
EXPECT_EQ(0u, avg.num_datums());
avg.AppendDatum(5.25);
avg.AppendDatum(3.25);
avg.PrependDatum(2.25);
EXPECT_EQ(old_value, avg.value());
}
} // namespace performance_manager
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