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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/power/auto_screen_brightness/als_samples.h"
#include <cmath>
#include <vector>
#include "base/check_op.h"
#include "base/test/simple_test_tick_clock.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace ash {
namespace power {
namespace auto_screen_brightness {
namespace {
// Checks |result.avg| and |result.stddev| are the same as that
// calculated from the |expected_data| vector.
void CheckAverageAndStdDev(const AlsAvgStdDev& result,
const std::vector<double>& expected_data) {
const size_t count = expected_data.size();
CHECK_NE(count, 0u);
double expected_avg = 0;
double expected_stddev = 0;
for (const auto& i : expected_data) {
expected_avg += i;
expected_stddev += i * i;
}
expected_avg = expected_avg / count;
expected_stddev =
std::sqrt(expected_stddev / count - expected_avg * expected_avg);
EXPECT_DOUBLE_EQ(result.avg, expected_avg);
EXPECT_DOUBLE_EQ(result.stddev, expected_stddev);
}
} // namespace
TEST(AmbientLightSampleBufferTest, Basic) {
base::SimpleTestTickClock tick_clock;
AmbientLightSampleBuffer buffer(base::Seconds(5));
std::vector<double> expected_data;
for (int i = 1; i < 6; ++i) {
tick_clock.Advance(base::Seconds(1));
const AmbientLightSampleBuffer::Sample sample = {static_cast<double>(i),
tick_clock.NowTicks()};
expected_data.push_back(i);
buffer.SaveToBuffer(sample);
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), static_cast<size_t>(i));
const AlsAvgStdDev avg_std =
buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).value();
CheckAverageAndStdDev(avg_std, expected_data);
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), static_cast<size_t>(i));
}
// Add another two items that will push out the oldest.
tick_clock.Advance(base::Seconds(1));
buffer.SaveToBuffer({10, tick_clock.NowTicks()});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 5u);
CheckAverageAndStdDev(
buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).value(),
{2, 3, 4, 5, 10});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 5u);
tick_clock.Advance(base::Seconds(1));
buffer.SaveToBuffer({20, tick_clock.NowTicks()});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 5u);
CheckAverageAndStdDev(
buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).value(),
{3, 4, 5, 10, 20});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 5u);
// Add another item but it doesn't push out the oldest.
tick_clock.Advance(base::Milliseconds(1));
buffer.SaveToBuffer({100, tick_clock.NowTicks()});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 6u);
CheckAverageAndStdDev(
buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).value(),
{3, 4, 5, 10, 20, 100});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 6u);
}
TEST(AmbientLightSampleBufferTest, LargeSampleTimeGap) {
base::SimpleTestTickClock tick_clock;
AmbientLightSampleBuffer buffer(base::Seconds(5));
tick_clock.Advance(base::Seconds(1));
const AmbientLightSampleBuffer::Sample sample = {10, tick_clock.NowTicks()};
buffer.SaveToBuffer(sample);
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 1u);
CheckAverageAndStdDev(
buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).value(), {10});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 1u);
// Another samples arrives sufficiently late so the 1st sample is pushed out.
tick_clock.Advance(base::Seconds(5));
buffer.SaveToBuffer({20, tick_clock.NowTicks()});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 1u);
CheckAverageAndStdDev(
buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).value(), {20});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 1u);
}
TEST(AmbientLightSampleBufferTest, AverageTimeTooLate) {
base::SimpleTestTickClock tick_clock;
AmbientLightSampleBuffer buffer(base::Seconds(5));
tick_clock.Advance(base::Seconds(1));
const AmbientLightSampleBuffer::Sample sample = {10, tick_clock.NowTicks()};
buffer.SaveToBuffer(sample);
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 1u);
CheckAverageAndStdDev(
buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).value(), {10});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 1u);
// When average is calculated, all samples are too old, hence average is
// nullopt.
tick_clock.Advance(base::Seconds(5));
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 1u);
EXPECT_FALSE(
buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).has_value());
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 0u);
}
TEST(AmbientLightSampleBufferTest, BufferCleared) {
base::SimpleTestTickClock tick_clock;
AmbientLightSampleBuffer buffer(base::Seconds(5));
// Save two data points and verify.
tick_clock.Advance(base::Seconds(1));
buffer.SaveToBuffer({10, tick_clock.NowTicks()});
tick_clock.Advance(base::Seconds(1));
buffer.SaveToBuffer({20, tick_clock.NowTicks()});
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 2u);
AlsAvgStdDev avg_std =
buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).value();
CheckAverageAndStdDev(avg_std, {10, 20});
// Clear buffer and verify.
buffer.ClearBuffer();
EXPECT_EQ(buffer.NumberOfSamplesForTesting(), 0u);
EXPECT_FALSE(
buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).has_value());
// Save another two data points and verify.
tick_clock.Advance(base::Seconds(1));
buffer.SaveToBuffer({30, tick_clock.NowTicks()});
tick_clock.Advance(base::Seconds(1));
buffer.SaveToBuffer({40, tick_clock.NowTicks()});
avg_std = buffer.AverageAmbientWithStdDev(tick_clock.NowTicks()).value();
CheckAverageAndStdDev(avg_std, {30, 40});
}
} // namespace auto_screen_brightness
} // namespace power
} // namespace ash
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