64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
/*
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* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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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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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0/
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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#include <gtest/gtest.h>
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#include "acsdkAssetsCommon/JitterUtil.h"
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using namespace std;
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using namespace std::chrono;
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using namespace ::testing;
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using namespace alexaClientSDK::acsdkAssets::common::jitterUtil;
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static const int NUMBER_OF_TRIES = 1000000;
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static constexpr milliseconds DELAY_MS(1000);
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static const float FACTOR = 0.2;
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class JitterUtilTest : public Test {};
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TEST_F(JitterUtilTest, jitterNeverFallsTest) {
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const milliseconds MIN_RANGE(800);
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const milliseconds MAX_RANGE(1200);
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milliseconds minValue = MAX_RANGE;
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milliseconds maxValue = MIN_RANGE;
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auto value = DELAY_MS;
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for (int i = 0; i < NUMBER_OF_TRIES; i++) {
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auto newValue = jitter(value, FACTOR);
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ASSERT_GE(newValue, MIN_RANGE);
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ASSERT_LE(newValue, MAX_RANGE);
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minValue = (minValue < newValue) ? minValue : newValue;
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maxValue = (maxValue > newValue) ? maxValue : newValue;
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}
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// Test if it's truly random
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ASSERT_GT(maxValue.count(), 1190);
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ASSERT_LT(minValue.count(), 810);
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}
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TEST_F(JitterUtilTest, jitterNeverZeroTest) {
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auto value = milliseconds(DELAY_MS);
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for (int i = 0; i < NUMBER_OF_TRIES; i++) {
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value = jitter(value, FACTOR);
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ASSERT_NE(value.count(), 0);
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}
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}
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TEST_F(JitterUtilTest, expJitterAlwaysGreaterTest) {
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auto value = milliseconds(DELAY_MS);
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for (int i = 0; i < NUMBER_OF_TRIES; i++) {
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ASSERT_GT(expJitter(value, FACTOR).count(), value.count());
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}
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}
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