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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_ASH_COMPONENTS_BOCA_ON_TASK_UTIL_MOCK_CLOCK_H_
#define CHROMEOS_ASH_COMPONENTS_BOCA_ON_TASK_UTIL_MOCK_CLOCK_H_
#include <memory>
#include "base/no_destructor.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "base/time/time.h"
#include "base/time/time_override.h"
namespace ash::boca {
// Mock clock that supplies a mock time and can be advanced for testing
// purposes. Only applicable for browser tests where a `TaskEnvironment` is
// unavailable.
class MockClock {
public:
// Returns a MockClock which will not be deleted. Should be called once while
// single-threaded to initialize ScopedTimeClockOverrides to avoid threading
// issues.
static MockClock& Get();
MockClock(const MockClock&) = delete;
MockClock& operator=(const MockClock&) = delete;
~MockClock();
// Advances clock by the specified duration.
void Advance(base::TimeDelta duration);
private:
friend base::NoDestructor<MockClock>;
// Static helpers that return the current time based on the offset duration.
// This is used to set up the time override.
static base::Time MockedNow();
static base::TimeTicks MockedTicksNow();
MockClock();
// Returns the offset duration.
base::TimeDelta Offset();
const std::unique_ptr<base::subtle::ScopedTimeClockOverrides> time_override_;
// A lock is necessary because `MockedNow` and `MockedTicksNow` can be
// accessed by components from different threads when they retrieve the
// current time.
base::Lock lock_;
base::TimeDelta offset_ GUARDED_BY(lock_);
};
} // namespace ash::boca
#endif // CHROMEOS_ASH_COMPONENTS_BOCA_ON_TASK_UTIL_MOCK_CLOCK_H_
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