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80 lines
2.4 KiB
80 lines
2.4 KiB
/* |
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* Copyright (C) 2017 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#include "android-base/chrono_utils.h" |
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#include <time.h> |
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#include <chrono> |
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#include <sstream> |
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#include <string> |
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#include <thread> |
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#include <gtest/gtest.h> |
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namespace android { |
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namespace base { |
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std::chrono::seconds GetBootTimeSeconds() { |
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struct timespec now; |
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clock_gettime(CLOCK_BOOTTIME, &now); |
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auto now_tp = boot_clock::time_point(std::chrono::seconds(now.tv_sec) + |
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std::chrono::nanoseconds(now.tv_nsec)); |
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return std::chrono::duration_cast<std::chrono::seconds>(now_tp.time_since_epoch()); |
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} |
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// Tests (at least) the seconds accuracy of the boot_clock::now() method. |
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TEST(ChronoUtilsTest, BootClockNowSeconds) { |
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auto now = GetBootTimeSeconds(); |
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auto boot_seconds = |
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std::chrono::duration_cast<std::chrono::seconds>(boot_clock::now().time_since_epoch()); |
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EXPECT_EQ(now, boot_seconds); |
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} |
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template <typename T> |
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void ExpectAboutEqual(T expected, T actual) { |
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auto expected_upper_bound = expected * 1.05f; |
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auto expected_lower_bound = expected * .95; |
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EXPECT_GT(expected_upper_bound, actual); |
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EXPECT_LT(expected_lower_bound, actual); |
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} |
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TEST(ChronoUtilsTest, TimerDurationIsSane) { |
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auto start = boot_clock::now(); |
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Timer t; |
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std::this_thread::sleep_for(50ms); |
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auto stop = boot_clock::now(); |
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auto stop_timer = t.duration(); |
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auto expected = std::chrono::duration_cast<std::chrono::milliseconds>(stop - start); |
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ExpectAboutEqual(expected, stop_timer); |
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} |
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TEST(ChronoUtilsTest, TimerOstream) { |
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Timer t; |
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std::this_thread::sleep_for(50ms); |
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auto stop_timer = t.duration().count(); |
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std::stringstream os; |
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os << t; |
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decltype(stop_timer) stop_timer_from_stream; |
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os >> stop_timer_from_stream; |
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EXPECT_NE(0, stop_timer); |
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ExpectAboutEqual(stop_timer, stop_timer_from_stream); |
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} |
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} // namespace base |
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} // namespace android
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