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base / moving_window_unittest.cc [blame]
// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/moving_window.h"
#include <array>
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
constexpr auto kTestValues = std::to_array<int>({
33, 1, 2, 7, 5, 2, 4, 45, 1000, 1, 100, 2, 200, 2, 2, 2, 300, 4, 1,
2, 3, 4, 5, 6, 7, 8, 9, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 1,
2, 1, 4, 2, 1, 8, 1, 2, 1, 4, 1, 2, 1, 16, 1, 2, 1,
});
} // namespace
class MovingMaxTest : public testing::TestWithParam<unsigned int> {};
INSTANTIATE_TEST_SUITE_P(All,
MovingMaxTest,
testing::ValuesIn({1u, 2u, 3u, 4u, 5u, 6u, 7u, 8u, 9u,
10u, 17u, 20u, 100u}));
TEST_P(MovingMaxTest, BlanketTest) {
const size_t window_size = GetParam();
MovingMax<int> window(window_size);
for (size_t i = 0; i < std::size(kTestValues); ++i) {
window.AddSample(kTestValues[i]);
int slow_max = kTestValues[i];
for (size_t j = 1; j < window_size && j <= i; ++j) {
slow_max = std::max(slow_max, kTestValues[i - j]);
}
EXPECT_EQ(window.Max(), slow_max);
}
}
TEST(MovingMax, SingleElementWindow) {
MovingMax<int> window(1u);
window.AddSample(100);
EXPECT_EQ(window.Max(), 100);
window.AddSample(1000);
EXPECT_EQ(window.Max(), 1000);
window.AddSample(1);
EXPECT_EQ(window.Max(), 1);
window.AddSample(3);
EXPECT_EQ(window.Max(), 3);
window.AddSample(4);
EXPECT_EQ(window.Max(), 4);
}
TEST(MovingMax, VeryLargeWindow) {
MovingMax<int> window(100u);
window.AddSample(100);
EXPECT_EQ(window.Max(), 100);
window.AddSample(1000);
EXPECT_EQ(window.Max(), 1000);
window.AddSample(1);
EXPECT_EQ(window.Max(), 1000);
window.AddSample(3);
EXPECT_EQ(window.Max(), 1000);
window.AddSample(4);
EXPECT_EQ(window.Max(), 1000);
}
TEST(MovingMax, Counts) {
MovingMax<int> window(3u);
EXPECT_EQ(window.Count(), 0u);
window.AddSample(100);
EXPECT_EQ(window.Count(), 1u);
window.AddSample(1000);
EXPECT_EQ(window.Count(), 2u);
window.AddSample(1);
EXPECT_EQ(window.Count(), 3u);
window.AddSample(3);
EXPECT_EQ(window.Count(), 4u);
window.AddSample(4);
EXPECT_EQ(window.Count(), 5u);
}
TEST(MovingAverage, Unrounded) {
MovingAverage<int, int64_t> window(4u);
window.AddSample(1);
EXPECT_EQ(window.Mean<double>(), 1.0);
window.AddSample(2);
EXPECT_EQ(window.Mean<double>(), 1.5);
window.AddSample(3);
EXPECT_EQ(window.Mean<double>(), 2.0);
window.AddSample(4);
EXPECT_EQ(window.Mean<double>(), 2.5);
window.AddSample(101);
EXPECT_EQ(window.Mean<double>(), 27.5);
}
class MovingMinTest : public testing::TestWithParam<unsigned int> {};
INSTANTIATE_TEST_SUITE_P(All,
MovingMinTest,
testing::ValuesIn({1u, 2u, 3u, 4u, 5u, 6u, 7u, 8u, 9u,
10u, 17u, 20u, 100u}));
TEST_P(MovingMinTest, BlanketTest) {
const size_t window_size = GetParam();
MovingMin<int> window(window_size);
for (int repeats = 0; repeats < 2; ++repeats) {
for (size_t i = 0; i < std::size(kTestValues); ++i) {
window.AddSample(kTestValues[i]);
int slow_min = kTestValues[i];
for (size_t j = 1; j < window_size && j <= i; ++j) {
slow_min = std::min(slow_min, kTestValues[i - j]);
}
EXPECT_EQ(window.Min(), slow_min);
}
window.Reset();
}
}
class MovingAverageTest : public testing::TestWithParam<unsigned int> {};
INSTANTIATE_TEST_SUITE_P(All,
MovingAverageTest,
testing::ValuesIn({1u, 2u, 3u, 4u, 5u, 6u, 7u, 8u, 9u,
10u, 17u, 20u, 100u}));
TEST_P(MovingAverageTest, BlanketTest) {
const size_t window_size = GetParam();
MovingAverage<int, int64_t> window(window_size);
for (int repeats = 0; repeats < 2; ++repeats) {
for (size_t i = 0; i < std::size(kTestValues); ++i) {
window.AddSample(kTestValues[i]);
int slow_mean = 0;
for (size_t j = 0; j < window_size && j <= i; ++j) {
slow_mean += kTestValues[i - j];
}
slow_mean /= std::min(window_size, i + 1);
EXPECT_EQ(window.Mean(), slow_mean);
}
window.Reset();
}
}
class MovingDeviationTest : public testing::TestWithParam<unsigned int> {};
INSTANTIATE_TEST_SUITE_P(All,
MovingDeviationTest,
testing::ValuesIn({1u, 2u, 3u, 4u, 5u, 6u, 7u, 8u, 9u,
10u, 17u, 20u, 100u}));
TEST_P(MovingDeviationTest, BlanketTest) {
const size_t window_size = GetParam();
MovingAverageDeviation<double> window(window_size);
for (int repeats = 0; repeats < 2; ++repeats) {
for (size_t i = 0; i < std::size(kTestValues); ++i) {
window.AddSample(kTestValues[i]);
double slow_deviation = 0;
double mean = window.Mean();
for (size_t j = 0; j < window_size && j <= i; ++j) {
slow_deviation +=
(kTestValues[i - j] - mean) * (kTestValues[i - j] - mean);
}
slow_deviation /= std::min(window_size, i + 1);
slow_deviation = sqrt(slow_deviation);
double fast_deviation = window.Deviation();
EXPECT_TRUE(std::abs(fast_deviation - slow_deviation) < 1e-9);
}
window.Reset();
}
}
TEST(MovingWindowTest, Iteration) {
const size_t kWindowSize = 10;
MovingWindow<int, base::MovingWindowFeatures::Iteration> window(kWindowSize);
for (int repeats = 0; repeats < 2; ++repeats) {
for (size_t i = 0; i < std::size(kTestValues); ++i) {
window.AddSample(kTestValues[i]);
size_t j = 0;
const size_t in_window = std::min(i + 1, kWindowSize);
for (int value : window) {
ASSERT_LT(j, in_window);
EXPECT_EQ(value, kTestValues[i + j + 1 - in_window]);
++j;
}
EXPECT_EQ(j, in_window);
}
window.Reset();
}
}
TEST(MovingMeanDeviation, WorksWithTimeDelta) {
MovingAverageDeviation<base::TimeDelta> window(2);
window.AddSample(base::Milliseconds(400));
window.AddSample(base::Milliseconds(200));
EXPECT_EQ(window.Mean(), base::Milliseconds(300));
EXPECT_EQ(window.Deviation(), base::Milliseconds(100));
window.AddSample(base::Seconds(40));
window.AddSample(base::Seconds(20));
EXPECT_EQ(window.Mean(), base::Seconds(30));
EXPECT_EQ(window.Deviation(), base::Seconds(10));
}
} // namespace base