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- // Copyright 2019 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "base/timer/lap_timer.h"
- #include "base/test/task_environment.h"
- #include "base/time/time.h"
- #include "build/build_config.h"
- #include "testing/gtest/include/gtest/gtest.h"
- // This file contains a minimal unit test for LapTimer, used for benchmarking.
- // This file is supposed to match closely with the example code, documented in
- // lap_timer.h. Please update that documentation if you need to change things.
- namespace base {
- namespace test {
- namespace {
- constexpr base::TimeDelta kTimeLimit = base::Milliseconds(15);
- constexpr base::TimeDelta kTimeAdvance = base::Milliseconds(1);
- constexpr int kWarmupRuns = 5;
- constexpr int kTimeCheckInterval = 10;
- } // namespace
- TEST(LapTimer, UsageExample) {
- TaskEnvironment task_environment(TaskEnvironment::TimeSource::MOCK_TIME);
- LapTimer timer(kWarmupRuns, kTimeLimit, kTimeCheckInterval);
- EXPECT_FALSE(timer.HasTimeLimitExpired());
- EXPECT_FALSE(timer.IsWarmedUp());
- do {
- task_environment.FastForwardBy(kTimeAdvance);
- timer.NextLap();
- } while (!timer.HasTimeLimitExpired());
- EXPECT_NEAR(timer.LapsPerSecond(), 1000, 0.1);
- EXPECT_NEAR(timer.TimePerLap().InMillisecondsF(), 1.0f, 0.1);
- // Output number of laps is 20, because the warm up runs are ignored and the
- // timer is only checked every kTimeInterval laps.
- EXPECT_EQ(timer.NumLaps(), 20);
- EXPECT_TRUE(timer.HasTimeLimitExpired());
- EXPECT_TRUE(timer.IsWarmedUp());
- }
- #if !BUILDFLAG(IS_IOS)
- // iOS simulator does not support using ThreadTicks.
- TEST(LapTimer, ThreadTicksUsageExample) {
- TaskEnvironment task_environment(TaskEnvironment::TimeSource::MOCK_TIME);
- LapTimer timer(kWarmupRuns, kTimeLimit, kTimeCheckInterval,
- LapTimer::TimerMethod::kUseThreadTicks);
- EXPECT_FALSE(timer.HasTimeLimitExpired());
- EXPECT_FALSE(timer.IsWarmedUp());
- do {
- task_environment.FastForwardBy(kTimeAdvance);
- timer.NextLap();
- } while (!timer.HasTimeLimitExpired());
- // Because advancing the TaskEnvironment time won't affect the
- // ThreadTicks, laps will be much faster than the regular UsageExample.
- EXPECT_GT(timer.LapsPerSecond(), 1000);
- EXPECT_LT(timer.TimePerLap().InMillisecondsF(), 1.0f);
- EXPECT_GT(timer.NumLaps(), 20);
- EXPECT_TRUE(timer.HasTimeLimitExpired());
- EXPECT_TRUE(timer.IsWarmedUp());
- }
- #endif
- } // namespace test
- } // namespace base
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