/*
* Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
*
* 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.
*/
package com.querydsl.core.util;
import static org.junit.Assert.*;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
public class MathUtilsTest {
@Rule
public final ExpectedException expectedException = ExpectedException.none();
@Test
public void sum() {
assertEquals(Integer.valueOf(5), MathUtils.sum(2, 3.0));
}
@Test
public void difference() {
assertEquals(Integer.valueOf(2), MathUtils.difference(5, 3.0));
}
@Test
public void cast_returns_correct_type() {
checkCast(1, BigDecimal.class);
checkCast(1, BigInteger.class);
checkCast(1, Double.class);
checkCast(1, Float.class);
checkCast(1, Integer.class);
checkCast(1, Long.class);
checkCast(1, Short.class);
checkCast(1, Byte.class);
}
@Test
public void cast_returns_argument_as_is_when_compatible() {
checkSame(BigDecimal.ONE, BigDecimal.class);
checkSame(BigInteger.ONE, BigInteger.class);
checkSame((double) 1, Double.class);
checkSame((float) 1, Float.class);
checkSame(1, Integer.class);
checkSame((long) 1, Long.class);
checkSame((short) 1, Short.class);
checkSame((byte) 1, Byte.class);
}
@Test
public void cast_returns_null_when_input_is_null() {
Integer result = MathUtils.cast(null, Integer.class);
assertNull(result);
}
@Test
public void cast_throws_on_unsupported_numbers() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Unsupported target type");
checkCast(1, AtomicInteger.class);
}
private static void checkCast(Number value, Class<? extends Number> targetClass) {
Number target = MathUtils.cast(value, targetClass);
assertSame(targetClass, target.getClass());
}
private static <N extends Number> void checkSame(N value, Class<N> targetClass) {
N target = MathUtils.cast(value, targetClass);
assertSame(value, target);
}
}