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