/*
* 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.sshd.common.util;
import java.util.Random;
import java.util.function.IntUnaryOperator;
import org.apache.sshd.util.test.BaseTestSupport;
import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.runners.MethodSorters;
/**
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class Int2IntFunctionTest extends BaseTestSupport {
public Int2IntFunctionTest() {
super();
}
@Test
public void testAdd() {
int factor = Byte.SIZE;
IntUnaryOperator func = Int2IntFunction.add(factor);
for (int index = 1, sum = 0; index <= Byte.SIZE; index++) {
sum = func.applyAsInt(sum);
assertEquals(factor * index, sum);
}
}
@Test
public void testAddIdentity() {
IntUnaryOperator func = Int2IntFunction.add(0);
Random rnd = new Random(System.nanoTime());
for (int index = 1; index <= Byte.SIZE; index++) {
int expected = rnd.nextInt();
int actual = func.applyAsInt(expected);
assertEquals(expected, actual);
}
}
@Test
public void testSub() {
int factor = Byte.SIZE;
IntUnaryOperator func = Int2IntFunction.sub(factor);
for (int index = 1, sum = 0; index <= Byte.SIZE; index++) {
sum = func.applyAsInt(sum);
assertEquals(factor * index * -1, sum);
}
}
@Test
public void testSubIdentity() {
IntUnaryOperator func = Int2IntFunction.sub(0);
Random rnd = new Random(System.nanoTime());
for (int index = 1; index <= Byte.SIZE; index++) {
int expected = rnd.nextInt();
int actual = func.applyAsInt(expected);
assertEquals(expected, actual);
}
}
@Test
public void testMul() {
int factor = 2;
IntUnaryOperator func = Int2IntFunction.mul(factor);
for (int index = 1, mul = 1, expected = factor; index <= Byte.SIZE; index++, expected *= factor) {
mul = func.applyAsInt(mul);
assertEquals(expected, mul);
}
}
@Test
public void testMulIdentity() {
IntUnaryOperator func = Int2IntFunction.mul(1);
Random rnd = new Random(System.nanoTime());
for (int index = 1; index <= Byte.SIZE; index++) {
int expected = rnd.nextInt();
int actual = func.applyAsInt(expected);
assertEquals(expected, actual);
}
}
@Test
public void testMulZero() {
IntUnaryOperator func = Int2IntFunction.mul(0);
Random rnd = new Random(System.nanoTime());
for (int index = 1; index <= Byte.SIZE; index++) {
int value = rnd.nextInt();
int actual = func.applyAsInt(value);
assertEquals(Integer.toString(value), 0, actual);
}
}
@Test
public void testConstant() {
int expected = 377347;
IntUnaryOperator func = Int2IntFunction.constant(expected);
Random rnd = new Random(System.nanoTime());
for (int index = 1; index <= Byte.SIZE; index++) {
int value = rnd.nextInt();
int actual = func.applyAsInt(value);
assertEquals(Integer.toString(value), expected, actual);
}
}
@Test
public void testDiv() {
int factor = 2;
IntUnaryOperator func = Int2IntFunction.div(factor);
for (int index = 1, quot = 65536, expected = quot / factor; index <= Byte.SIZE; index++, expected /= factor) {
quot = func.applyAsInt(quot);
assertEquals(expected, quot);
}
}
@Test
public void testDivIdentity() {
IntUnaryOperator func = Int2IntFunction.div(1);
Random rnd = new Random(System.nanoTime());
for (int index = 1; index <= Byte.SIZE; index++) {
int expected = rnd.nextInt();
int actual = func.applyAsInt(expected);
assertEquals(expected, actual);
}
}
@Test(expected = IllegalArgumentException.class)
public void testDivZeroFactor() {
IntUnaryOperator func = Int2IntFunction.div(0);
fail("Unexpected success: " + func);
}
}