Add test cases for MathUtil. (#10071)
Motivation: MathUtil needs more test cases. Modification: Add several test cases for MathUtil. Result: Improve test coverage slightly.
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/*
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* Copyright 2020 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util.internal;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertTrue;
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import static io.netty.util.internal.MathUtil.*;
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import org.junit.Test;
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public class MathUtilTest {
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@Test
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public void testFindNextPositivePowerOfTwo() {
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assertEquals(1, findNextPositivePowerOfTwo(0));
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assertEquals(1, findNextPositivePowerOfTwo(1));
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assertEquals(1024, findNextPositivePowerOfTwo(1000));
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assertEquals(1024, findNextPositivePowerOfTwo(1023));
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assertEquals(2048, findNextPositivePowerOfTwo(2048));
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assertEquals(1 << 30, findNextPositivePowerOfTwo((1 << 30) - 1));
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assertEquals(1, findNextPositivePowerOfTwo(-1));
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assertEquals(1, findNextPositivePowerOfTwo(-10000));
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}
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@Test
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public void testSafeFindNextPositivePowerOfTwo() {
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assertEquals(1, safeFindNextPositivePowerOfTwo(0));
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assertEquals(1, safeFindNextPositivePowerOfTwo(1));
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assertEquals(1024, safeFindNextPositivePowerOfTwo(1000));
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assertEquals(1024, safeFindNextPositivePowerOfTwo(1023));
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assertEquals(2048, safeFindNextPositivePowerOfTwo(2048));
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assertEquals(1 << 30, safeFindNextPositivePowerOfTwo((1 << 30) - 1));
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assertEquals(1, safeFindNextPositivePowerOfTwo(-1));
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assertEquals(1, safeFindNextPositivePowerOfTwo(-10000));
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assertEquals(1 << 30, safeFindNextPositivePowerOfTwo(Integer.MAX_VALUE));
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assertEquals(1 << 30, safeFindNextPositivePowerOfTwo((1 << 30) + 1));
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assertEquals(1, safeFindNextPositivePowerOfTwo(Integer.MIN_VALUE));
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assertEquals(1, safeFindNextPositivePowerOfTwo(Integer.MIN_VALUE + 1));
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}
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@Test
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public void testIsOutOfBounds() {
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assertFalse(isOutOfBounds(0, 0, 0));
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assertFalse(isOutOfBounds(0, 0, 1));
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assertFalse(isOutOfBounds(0, 1, 1));
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assertTrue(isOutOfBounds(1, 1, 1));
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assertTrue(isOutOfBounds(Integer.MAX_VALUE, 1, 1));
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assertTrue(isOutOfBounds(Integer.MAX_VALUE, Integer.MAX_VALUE, 1));
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assertTrue(isOutOfBounds(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE));
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assertFalse(isOutOfBounds(0, Integer.MAX_VALUE, Integer.MAX_VALUE));
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assertFalse(isOutOfBounds(0, Integer.MAX_VALUE - 1, Integer.MAX_VALUE));
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assertTrue(isOutOfBounds(0, Integer.MAX_VALUE, Integer.MAX_VALUE - 1));
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assertFalse(isOutOfBounds(Integer.MAX_VALUE - 1, 1, Integer.MAX_VALUE));
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assertTrue(isOutOfBounds(Integer.MAX_VALUE - 1, 1, Integer.MAX_VALUE - 1));
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assertTrue(isOutOfBounds(Integer.MAX_VALUE - 1, 2, Integer.MAX_VALUE));
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assertTrue(isOutOfBounds(1, Integer.MAX_VALUE, Integer.MAX_VALUE));
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}
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@Test
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public void testCompare() {
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assertEquals(-1, compare(0, 1));
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assertEquals(-1, compare(0L, 1L));
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assertEquals(-1, compare(0, Integer.MAX_VALUE));
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assertEquals(-1, compare(0L, Long.MAX_VALUE));
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assertEquals(0, compare(0, 0));
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assertEquals(0, compare(0L, 0L));
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assertEquals(0, compare(Integer.MIN_VALUE, Integer.MIN_VALUE));
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assertEquals(0, compare(Long.MIN_VALUE, Long.MIN_VALUE));
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assertEquals(1, compare(Integer.MAX_VALUE, 0));
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assertEquals(1, compare(Integer.MAX_VALUE, Integer.MAX_VALUE - 1));
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assertEquals(1, compare(Long.MAX_VALUE, 0L));
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assertEquals(1, compare(Long.MAX_VALUE, Long.MAX_VALUE - 1));
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}
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}
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