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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromecast/base/system_time_change_notifier.h"
#include <memory>
#include <utility>
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/run_loop.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/single_thread_task_runner.h"
#include "base/test/task_environment.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace chromecast {
namespace {
class SequencedTaskRunnerNoDelay : public base::SequencedTaskRunner {
public:
SequencedTaskRunnerNoDelay() {}
SequencedTaskRunnerNoDelay(const SequencedTaskRunnerNoDelay&) = delete;
SequencedTaskRunnerNoDelay& operator=(const SequencedTaskRunnerNoDelay&) =
delete;
// base::SequencedTaskRunner implementation:
bool PostDelayedTask(const base::Location& from_here,
base::OnceClosure task,
base::TimeDelta delay) override {
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
from_here, std::move(task));
return true;
}
bool PostNonNestableDelayedTask(const base::Location& from_here,
base::OnceClosure task,
base::TimeDelta delay) override {
return true;
}
bool RunsTasksInCurrentSequence() const override { return true; }
private:
~SequencedTaskRunnerNoDelay() override {}
};
class TimeChangeObserver : public SystemTimeChangeNotifier::Observer {
public:
TimeChangeObserver() : num_time_changed_(0) {}
TimeChangeObserver(const TimeChangeObserver&) = delete;
TimeChangeObserver& operator=(const TimeChangeObserver&) = delete;
~TimeChangeObserver() override {}
// SystemTimeChangeNotifier::Observer implementation:
void OnSystemTimeChanged() override { ++num_time_changed_; }
int num_time_changed() const { return num_time_changed_; }
private:
int num_time_changed_;
};
} // namespace
class SystemTimeChangeNotifierTest : public testing::Test {
protected:
void SetUp() override {
notifier_.reset(new SystemTimeChangeNotifierPeriodicMonitor(
new SequencedTaskRunnerNoDelay()));
observer_.reset(new TimeChangeObserver);
notifier_->AddObserver(observer_.get());
}
// Runs pending tasks. It doesn't run tasks schedule after this call.
void RunPendingTasks() {
base::RunLoop run_loop;
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, run_loop.QuitClosure());
run_loop.Run();
}
base::test::SingleThreadTaskEnvironment task_environment_;
std::unique_ptr<SystemTimeChangeNotifierPeriodicMonitor> notifier_;
std::unique_ptr<TimeChangeObserver> observer_;
};
TEST_F(SystemTimeChangeNotifierTest, NotChanged) {
EXPECT_EQ(0, observer_->num_time_changed());
// Not changed.
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
}
TEST_F(SystemTimeChangeNotifierTest, TimeChangedForwardLessThan10Seconds) {
base::Time now = base::Time::Now();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change NOT detected.
notifier_->set_fake_now_for_testing(now + base::Seconds(4));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
}
TEST_F(SystemTimeChangeNotifierTest, TimeChangedBackwardLessThan10Seconds) {
base::Time now = base::Time::Now();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change NOT detected.
notifier_->set_fake_now_for_testing(now - base::Seconds(4));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
}
TEST_F(SystemTimeChangeNotifierTest, TimeChangedForwardMoreThan10Seconds) {
base::Time now = base::Time::Now();
EXPECT_EQ(0, observer_->num_time_changed());
notifier_->set_fake_now_for_testing(now + base::Seconds(40));
RunPendingTasks();
// Still 0 since observe callback is running in next run loop.
EXPECT_EQ(0, observer_->num_time_changed());
RunPendingTasks();
// Time change detected.
EXPECT_EQ(1, observer_->num_time_changed());
}
TEST_F(SystemTimeChangeNotifierTest, TimeChangedBackwardMoreThan10Seconds) {
base::Time now = base::Time::Now();
EXPECT_EQ(0, observer_->num_time_changed());
notifier_->set_fake_now_for_testing(now - base::Seconds(40));
RunPendingTasks();
// Still 0 since observe callback is running in next run loop.
EXPECT_EQ(0, observer_->num_time_changed());
RunPendingTasks();
// Time change detected.
EXPECT_EQ(1, observer_->num_time_changed());
}
TEST_F(SystemTimeChangeNotifierTest, CannotDetectTimeDriftForward) {
base::Time now = base::Time::Now();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change NOT detected. Expected = now + 1, actual = now + 4.
notifier_->set_fake_now_for_testing(now + base::Seconds(4));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change NOT detected. Expected = now + 4 + 1, actual = now + 8.
notifier_->set_fake_now_for_testing(now + base::Seconds(8));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change NOT detected. Expected = now + 8 + 1, actual = now + 12.
notifier_->set_fake_now_for_testing(now + base::Seconds(12));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change detected. Expected = now + 12 + 1, actual = now + 16.
notifier_->set_fake_now_for_testing(now + base::Seconds(16));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change detected. Expected = now + 16 + 1, actual = now + 20.
notifier_->set_fake_now_for_testing(now + base::Seconds(20));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
}
TEST_F(SystemTimeChangeNotifierTest, CannotDetectTTimeDriftBackward) {
base::Time now = base::Time::Now();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change NOT detected. Expected = now + 1, actual = now - 4.
notifier_->set_fake_now_for_testing(now - base::Seconds(4));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change NOT detected. Expected = now - 4 + 1, actual = now - 8.
notifier_->set_fake_now_for_testing(now - base::Seconds(8));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change detected. Expected = now - 8 + 1, actual = now - 12.
notifier_->set_fake_now_for_testing(now - base::Seconds(12));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change detected. Expected = now - 12 + 1, actual = now - 16.
notifier_->set_fake_now_for_testing(now - base::Seconds(16));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
// Time change detected. Expected = now - 20 + 1, actual = now - 20.
notifier_->set_fake_now_for_testing(now - base::Seconds(20));
RunPendingTasks();
EXPECT_EQ(0, observer_->num_time_changed());
}
} // namespace chromecast
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