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PowerOf2UtilTest.java
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PowerOf2UtilTest.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.activemq.artemis.utils;
import org.junit.Assert;
import org.junit.Test;
import static org.apache.activemq.artemis.utils.PowerOf2Util.align;
public class PowerOf2UtilTest {
@Test
public void shouldAlignToNextMultipleOfAlignment() {
final int alignment = 512;
Assert.assertEquals(0, align(0, alignment));
Assert.assertEquals(alignment, align(1, alignment));
Assert.assertEquals(alignment, align(alignment, alignment));
Assert.assertEquals(alignment * 2, align(alignment + 1, alignment));
final int remainder = Integer.MAX_VALUE % alignment;
final int alignedMax = Integer.MAX_VALUE - remainder;
Assert.assertEquals(alignedMax, align(alignedMax, alignment));
//given that Integer.MAX_VALUE is the max value that can be represented with int
//the aligned value would be > 2^32, but (int)(2^32) = Integer.MIN_VALUE due to the sign bit
Assert.assertEquals(Integer.MIN_VALUE, align(Integer.MAX_VALUE, alignment));
}
}