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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 "third_party/blink/renderer/platform/scheduler/main_thread/task_cost_estimator.h"
#include <memory>
#include "base/test/simple_test_tick_clock.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace blink {
namespace scheduler {
class TaskCostEstimatorTest : public testing::Test {
public:
TaskCostEstimatorTest() = default;
~TaskCostEstimatorTest() override = default;
base::SimpleTestTickClock clock_;
};
class TaskCostEstimatorForTest : public TaskCostEstimator {
public:
TaskCostEstimatorForTest(const base::TickClock* clock,
int sample_count,
double estimation_percentile)
: TaskCostEstimator(clock, sample_count, estimation_percentile) {}
};
TEST_F(TaskCostEstimatorTest, BasicEstimation) {
TaskCostEstimatorForTest estimator(&clock_, 1, 100);
base::PendingTask task(FROM_HERE, base::Closure());
estimator.WillProcessTask(task);
clock_.Advance(base::TimeDelta::FromMilliseconds(500));
estimator.DidProcessTask(task);
EXPECT_EQ(base::TimeDelta::FromMilliseconds(500),
estimator.expected_task_duration());
}
TEST_F(TaskCostEstimatorTest, Clear) {
TaskCostEstimatorForTest estimator(&clock_, 1, 100);
base::PendingTask task(FROM_HERE, base::Closure());
estimator.WillProcessTask(task);
clock_.Advance(base::TimeDelta::FromMilliseconds(500));
estimator.DidProcessTask(task);
estimator.Clear();
EXPECT_EQ(base::TimeDelta(), estimator.expected_task_duration());
}
TEST_F(TaskCostEstimatorTest, NestedRunLoop) {
TaskCostEstimatorForTest estimator(&clock_, 1, 100);
base::PendingTask task(FROM_HERE, base::Closure());
// Make sure we ignore the tasks inside the nested run loop.
estimator.WillProcessTask(task);
estimator.WillProcessTask(task);
clock_.Advance(base::TimeDelta::FromMilliseconds(500));
estimator.DidProcessTask(task);
clock_.Advance(base::TimeDelta::FromMilliseconds(500));
estimator.DidProcessTask(task);
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1000),
estimator.expected_task_duration());
}
} // namespace scheduler
} // namespace blink
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