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Merge "SystemClock: add test"

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Treehugger Robot 2016-05-16 18:18:30 +00:00 committed by Gerrit Code Review
parent 4cefb91611 340079df26
commit 282e8fb037
2 changed files with 75 additions and 0 deletions
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1
libutils/tests/Android.mk
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@ -28,6 +28,7 @@ LOCAL_SRC_FILES := \
LruCache_test.cpp \
String8_test.cpp \
StrongPointer_test.cpp \
SystemClock_test.cpp \
Unicode_test.cpp \
Vector_test.cpp \

74
libutils/tests/SystemClock_test.cpp Normal file
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@ -0,0 +1,74 @@
/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <unistd.h>
#include <utils/SystemClock.h>
#include <gtest/gtest.h>
static const auto MS_IN_NS = 1000000;
static const int64_t SLEEP_MS = 500;
static const int64_t SLEEP_NS = SLEEP_MS * MS_IN_NS;
// Conservatively assume that we might be descheduled for up to 50 ms
static const int64_t SLACK_MS = 50;
static const int64_t SLACK_NS = SLACK_MS * MS_IN_NS;
TEST(SystemClock, SystemClock) {
auto startUptimeMs = android::uptimeMillis();
auto startRealtimeMs = android::elapsedRealtime();
auto startRealtimeNs = android::elapsedRealtimeNano();
ASSERT_GT(startUptimeMs, 0)
<< "uptimeMillis() reported an impossible uptime";
ASSERT_GE(startRealtimeMs, startUptimeMs)
<< "elapsedRealtime() thinks we've suspended for negative time";
ASSERT_GE(startRealtimeNs, startUptimeMs * MS_IN_NS)
<< "elapsedRealtimeNano() thinks we've suspended for negative time";
ASSERT_GE(startRealtimeNs, startRealtimeMs * MS_IN_NS)
<< "elapsedRealtime() and elapsedRealtimeNano() are inconsistent";
ASSERT_LT(startRealtimeNs, (startRealtimeMs + SLACK_MS) * MS_IN_NS)
<< "elapsedRealtime() and elapsedRealtimeNano() are inconsistent";
timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = SLEEP_MS * MS_IN_NS;
auto nanosleepErr = TEMP_FAILURE_RETRY(nanosleep(&ts, nullptr));
ASSERT_EQ(nanosleepErr, 0) << "nanosleep() failed: " << strerror(errno);
auto endUptimeMs = android::uptimeMillis();
auto endRealtimeMs = android::elapsedRealtime();
auto endRealtimeNs = android::elapsedRealtimeNano();
EXPECT_GE(endUptimeMs - startUptimeMs, SLEEP_MS)
<< "uptimeMillis() advanced too little after nanosleep()";
EXPECT_LT(endUptimeMs - startUptimeMs, SLEEP_MS + SLACK_MS)
<< "uptimeMillis() advanced too much after nanosleep()";
EXPECT_GE(endRealtimeMs - startRealtimeMs, SLEEP_MS)
<< "elapsedRealtime() advanced too little after nanosleep()";
EXPECT_LT(endRealtimeMs - startRealtimeMs, SLEEP_MS + SLACK_MS)
<< "elapsedRealtime() advanced too much after nanosleep()";
EXPECT_GE(endRealtimeNs - startRealtimeNs, SLEEP_NS)
<< "elapsedRealtimeNano() advanced too little after nanosleep()";
EXPECT_LT(endRealtimeNs - startRealtimeNs, SLEEP_NS + SLACK_NS)
<< "elapsedRealtimeNano() advanced too much after nanosleep()";
EXPECT_GE(endRealtimeNs, endRealtimeMs * MS_IN_NS)
<< "elapsedRealtime() and elapsedRealtimeNano() are inconsistent after nanosleep()";
EXPECT_LT(endRealtimeNs, (endRealtimeMs + SLACK_MS) * MS_IN_NS)
<< "elapsedRealtime() and elapsedRealtimeNano() are inconsistent after nanosleep()";
}