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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TEST_SCOPED_MOCK_CLOCK_OVERRIDE_H_
#define BASE_TEST_SCOPED_MOCK_CLOCK_OVERRIDE_H_
#include <memory>
#include "base/time/time.h"
#include "base/time/time_override.h"
namespace base {
// Override the return value of Time::Now(), Time::NowFromSystemTime(),
// TimeTicks::Now(), and ThreadTicks::Now() through a simple advanceable clock.
//
// This utility is intended to support tests that:
//
// - Depend on large existing codebases that call TimeXYZ::Now() directly or
// - Have no ability to inject a TickClock into the code getting the time
// (e.g. integration tests in which a TickClock would be several layers
// removed from the test code)
//
// NOTE: Overriding Time/TimeTicks altogether via
// TaskEnvironment::TimeSource::MOCK_TIME is now the preferred way of overriding
// time in unit tests.
//
// NOTE: ScopedMockClockOverride should be created while single-threaded and
// before the first call to Now() to avoid threading issues and inconsistencies
// in returned values. Nested overrides are not allowed.
class ScopedMockClockOverride {
public:
ScopedMockClockOverride();
ScopedMockClockOverride(const ScopedMockClockOverride&) = delete;
ScopedMockClockOverride& operator=(const ScopedMockClockOverride&) = delete;
~ScopedMockClockOverride();
static Time Now();
static TimeTicks NowTicks();
static ThreadTicks NowThreadTicks();
void Advance(TimeDelta delta);
private:
std::unique_ptr<base::subtle::ScopedTimeClockOverrides> time_clock_overrides_;
TimeDelta offset_;
static ScopedMockClockOverride* scoped_mock_clock_;
};
} // namespace base
#endif // BASE_TEST_SCOPED_MOCK_CLOCK_OVERRIDE_H_
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