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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/timer/elapsed_timer.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
constexpr TimeDelta kSleepDuration = Milliseconds(20);
}
TEST(ElapsedTimerTest, Simple) {
ElapsedTimer timer;
PlatformThread::Sleep(kSleepDuration);
EXPECT_GE(timer.Elapsed(), kSleepDuration);
// Can call |Elapsed()| multiple times.
PlatformThread::Sleep(kSleepDuration);
EXPECT_GE(timer.Elapsed(), 2 * kSleepDuration);
}
TEST(ElapsedTimerTest, Mocked) {
ScopedMockElapsedTimersForTest mock_elapsed_timer;
ElapsedTimer timer;
EXPECT_EQ(timer.Elapsed(), ScopedMockElapsedTimersForTest::kMockElapsedTime);
// Real-time doesn't matter.
PlatformThread::Sleep(kSleepDuration);
EXPECT_EQ(timer.Elapsed(), ScopedMockElapsedTimersForTest::kMockElapsedTime);
}
class ElapsedThreadTimerTest : public ::testing::Test {
protected:
void SetUp() override {
if (ThreadTicks::IsSupported())
ThreadTicks::WaitUntilInitialized();
}
};
TEST_F(ElapsedThreadTimerTest, IsSupported) {
ElapsedThreadTimer timer;
if (!ThreadTicks::IsSupported()) {
EXPECT_FALSE(timer.is_supported());
EXPECT_EQ(TimeDelta(), timer.Elapsed());
} else {
EXPECT_TRUE(timer.is_supported());
}
}
TEST_F(ElapsedThreadTimerTest, Simple) {
if (!ThreadTicks::IsSupported())
return;
ElapsedThreadTimer timer;
EXPECT_TRUE(timer.is_supported());
// 1ms of work.
constexpr TimeDelta kLoopingTime = Milliseconds(1);
const ThreadTicks start_ticks = ThreadTicks::Now();
while (ThreadTicks::Now() - start_ticks < kLoopingTime) {
}
EXPECT_GE(timer.Elapsed(), kLoopingTime);
}
TEST_F(ElapsedThreadTimerTest, DoesNotCountSleep) {
if (!ThreadTicks::IsSupported())
return;
ElapsedThreadTimer timer;
EXPECT_TRUE(timer.is_supported());
PlatformThread::Sleep(kSleepDuration);
// Sleep time is not accounted for.
EXPECT_LT(timer.Elapsed(), kSleepDuration);
}
TEST_F(ElapsedThreadTimerTest, Mocked) {
if (!ThreadTicks::IsSupported())
return;
ScopedMockElapsedTimersForTest mock_elapsed_timer;
ElapsedThreadTimer timer;
EXPECT_EQ(timer.Elapsed(), ScopedMockElapsedTimersForTest::kMockElapsedTime);
// Real-time doesn't matter.
PlatformThread::Sleep(kSleepDuration);
EXPECT_EQ(timer.Elapsed(), ScopedMockElapsedTimersForTest::kMockElapsedTime);
}
} // namespace base
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