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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/network_time/time_tracker/time_tracker.h"
#include "base/test/simple_test_clock.h"
#include "base/test/simple_test_tick_clock.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace network_time {
class TimeTrackerTest : public ::testing::Test {
public:
~TimeTrackerTest() override = default;
TimeTrackerTest() = default;
protected:
base::SimpleTestClock clock_;
base::SimpleTestTickClock tick_clock_;
};
TEST_F(TimeTrackerTest, SystemClockIsWrong) {
base::Time in_network_time = clock_.Now() - base::Days(90);
TimeTracker tracker = TimeTracker(clock_.Now(), tick_clock_.NowTicks(),
in_network_time, base::TimeDelta());
base::Time out_network_time;
EXPECT_TRUE(tracker.GetTime(clock_.Now(), tick_clock_.NowTicks(),
&out_network_time, nullptr));
EXPECT_EQ(in_network_time, out_network_time);
}
TEST_F(TimeTrackerTest, SmallDivergence) {
base::Time in_network_time = clock_.Now();
TimeTracker tracker = TimeTracker(clock_.Now(), tick_clock_.NowTicks(),
in_network_time, base::TimeDelta());
// Make tick clock and clock diverge by 30 seconds, which is under the
// allowed limit.
tick_clock_.Advance(base::Seconds(30));
base::Time out_network_time;
EXPECT_TRUE(tracker.GetTime(clock_.Now(), tick_clock_.NowTicks(),
&out_network_time, nullptr));
EXPECT_EQ(in_network_time + base::Seconds(30), out_network_time);
}
TEST_F(TimeTrackerTest, BigDivergence) {
base::Time in_network_time = clock_.Now();
TimeTracker tracker = TimeTracker(clock_.Now(), tick_clock_.NowTicks(),
in_network_time, base::TimeDelta());
// Make tick clock and clock diverge by 61 seconds, which is over the
// allowed limit.
tick_clock_.Advance(base::Seconds(61));
base::Time out_network_time;
EXPECT_FALSE(tracker.GetTime(clock_.Now(), tick_clock_.NowTicks(),
&out_network_time, nullptr));
}
TEST_F(TimeTrackerTest, TimeRanBackwards) {
base::Time in_network_time = clock_.Now();
TimeTracker tracker = TimeTracker(clock_.Now(), tick_clock_.NowTicks(),
in_network_time, base::TimeDelta());
clock_.Advance(base::Seconds(-1));
base::Time out_network_time;
EXPECT_FALSE(tracker.GetTime(clock_.Now(), tick_clock_.NowTicks(),
&out_network_time, nullptr));
}
TEST_F(TimeTrackerTest, UncertaintyCalculation) {
base::Time in_network_time = clock_.Now();
base::TimeDelta initial_uncertainty = base::Seconds(5);
TimeTracker tracker = TimeTracker(clock_.Now(), tick_clock_.NowTicks(),
in_network_time, initial_uncertainty);
base::Time out_network_time;
// The returned uncertainty should be equal to the initial uncertainty + the
// divergence between clock and tick clock.
base::TimeDelta out_uncertainty;
tick_clock_.Advance(base::Seconds(3));
EXPECT_TRUE(tracker.GetTime(clock_.Now(), tick_clock_.NowTicks(),
&out_network_time, &out_uncertainty));
EXPECT_EQ(in_network_time + base::Seconds(3), out_network_time);
EXPECT_EQ(out_uncertainty, base::Seconds(8));
}
} // namespace network_time
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