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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/webrtc_overrides/test/metronome_like_task_queue_test.h"
#include <cstddef>
#include <memory>
#include <string>
#include <vector>
#include "base/time/time.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/abseil-cpp/absl/functional/any_invocable.h"
#include "third_party/webrtc/api/units/time_delta.h"
namespace blink {
using ::testing::ElementsAre;
using ::testing::MockFunction;
namespace {
class MockCallback {
public:
MockCallback() {
EXPECT_CALL(callback_, Call()).WillRepeatedly([&]() { ++callback_count_; });
}
size_t callback_count() const { return callback_count_; }
bool was_called() const { return callback_count_ > 0; }
absl::AnyInvocable<void() &&> ToTask() { return callback_.AsStdFunction(); }
private:
MockFunction<void()> callback_;
size_t callback_count_ = 0;
};
webrtc::TimeDelta ToWebrtc(base::TimeDelta delta) {
return webrtc::TimeDelta::Micros(delta.InMicroseconds());
}
} // namespace
TEST_P(MetronomeLikeTaskQueueTest, PostTaskRunsPriorToTick) {
auto* task_queue = provider_->TaskQueue();
MockCallback callback;
EXPECT_FALSE(callback.was_called());
task_queue->PostTask(callback.ToTask());
// The task environment uses multiple threads so it's possible for the
// callback to be invoked as soon as we call PostTask(), but by advancing time
// we ensure the task has had time to run.
task_environment_.FastForwardBy(base::Nanoseconds(1));
EXPECT_TRUE(callback.was_called());
}
TEST_P(MetronomeLikeTaskQueueTest, NormalPriorityDelayedTasksRunOnTicks) {
auto* task_queue = provider_->TaskQueue();
// Delay task until next tick.
MockCallback callback;
task_queue->PostDelayedTask(callback.ToTask(),
ToWebrtc(provider_->MetronomeTick()));
EXPECT_EQ(callback.callback_count(), 0u);
task_environment_.FastForwardBy(provider_->MetronomeTick());
EXPECT_EQ(callback.callback_count(), 1u);
// Delay half a tick. A full tick must pass before it runs.
task_queue->PostDelayedTask(callback.ToTask(),
ToWebrtc(provider_->MetronomeTick() / 2));
task_environment_.FastForwardBy(provider_->MetronomeTick() -
base::Milliseconds(1));
EXPECT_EQ(callback.callback_count(), 1u);
task_environment_.FastForwardBy(base::Milliseconds(1));
EXPECT_EQ(callback.callback_count(), 2u);
// Delay several ticks.
task_queue->PostDelayedTask(callback.ToTask(),
ToWebrtc(provider_->MetronomeTick() * 3));
task_environment_.FastForwardBy(provider_->MetronomeTick() * 2);
EXPECT_EQ(callback.callback_count(), 2u);
task_environment_.FastForwardBy(provider_->MetronomeTick());
EXPECT_EQ(callback.callback_count(), 3u);
}
TEST_P(MetronomeLikeTaskQueueTest,
NormalPriorityHighPrecisionDelayedTasksRunOutsideTicks) {
auto* task_queue = provider_->TaskQueue();
MockCallback callback;
task_queue->PostDelayedHighPrecisionTask(callback.ToTask(),
webrtc::TimeDelta::Millis(1));
EXPECT_FALSE(callback.was_called());
task_environment_.FastForwardBy(base::Milliseconds(1));
EXPECT_TRUE(callback.was_called());
}
TEST_P(MetronomeLikeTaskQueueTest, MixedPrecisionDelayedTasksRunAsExpected) {
auto* task_queue = provider_->TaskQueue();
MockCallback callback;
// Setup 3 callbacks:
// 1) Low precision, should execute on the first metronome tick.
// 2) High precision, should execute between first and second metronome tick.
// 3) Low precision, should execute on the second metronome tick.
const base::TimeDelta tick_duration = provider_->MetronomeTick();
const webrtc::TimeDelta webrtc_tick_duration = ToWebrtc(tick_duration);
task_queue->PostDelayedTask(callback.ToTask(), webrtc_tick_duration / 2);
task_queue->PostDelayedHighPrecisionTask(callback.ToTask(),
3 * webrtc_tick_duration / 2);
task_queue->PostDelayedTask(callback.ToTask(), 3 * webrtc_tick_duration / 2);
task_environment_.FastForwardBy(tick_duration);
EXPECT_EQ(callback.callback_count(), 1u);
task_environment_.FastForwardBy(tick_duration / 2 + base::Microseconds(1));
EXPECT_EQ(callback.callback_count(), 2u);
task_environment_.FastForwardBy(tick_duration / 2 + base::Microseconds(1));
EXPECT_EQ(callback.callback_count(), 3u);
}
TEST_P(MetronomeLikeTaskQueueTest, DelayedTasksRunInOrder) {
auto* task_queue = provider_->TaskQueue();
constexpr webrtc::TimeDelta kTime0 = webrtc::TimeDelta::Millis(1);
constexpr webrtc::TimeDelta kTime1 = webrtc::TimeDelta::Millis(2);
std::vector<std::string> run_tasks;
task_queue->PostDelayedTask(
[&run_tasks]() { run_tasks.emplace_back("Time0_First"); }, kTime0);
task_queue->PostDelayedTask(
[&run_tasks]() { run_tasks.emplace_back("Time1_First"); }, kTime1);
task_queue->PostDelayedTask(
[&run_tasks]() { run_tasks.emplace_back("Time1_Second"); }, kTime1);
task_queue->PostDelayedTask(
[&run_tasks]() { run_tasks.emplace_back("Time0_Second"); }, kTime0);
task_queue->PostDelayedTask(
[&run_tasks]() { run_tasks.emplace_back("Time0_Third"); }, kTime0);
task_queue->PostDelayedTask(
[&run_tasks]() { run_tasks.emplace_back("Time1_Third"); }, kTime1);
task_environment_.FastForwardBy(provider_->MetronomeTick());
EXPECT_THAT(run_tasks,
ElementsAre("Time0_First", "Time0_Second", "Time0_Third",
"Time1_First", "Time1_Second", "Time1_Third"));
}
TEST_P(MetronomeLikeTaskQueueTest, DelayedTaskCanPostDelayedTask) {
auto* task_queue = provider_->TaskQueue();
bool task0_ran = false;
bool task1_ran = false;
task_queue->PostDelayedTask(
[tick = provider_->MetronomeTick(), &task_queue, &task0_ran,
&task1_ran]() {
task0_ran = true;
// Inception!
task_queue->PostDelayedTask([&task1_ran]() { task1_ran = true; },
ToWebrtc(tick));
},
ToWebrtc(provider_->MetronomeTick()));
task_environment_.FastForwardBy(provider_->MetronomeTick());
EXPECT_TRUE(task0_ran);
EXPECT_FALSE(task1_ran);
task_environment_.FastForwardBy(provider_->MetronomeTick());
EXPECT_TRUE(task0_ran);
EXPECT_TRUE(task1_ran);
}
} // namespace blink
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