| // Copyright 2017 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 "chrome/browser/resource_coordinator/exponential_moving_average.h" |
| |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace resource_coordinator { |
| |
| 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 resource_coordinator |