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/*
* Copyright (C) 2011 The Guava Authors
*
* 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.google.common.math;
import static com.google.common.math.MathTesting.ALL_BIGINTEGER_CANDIDATES;
import static com.google.common.math.MathTesting.FINITE_DOUBLE_CANDIDATES;
import static com.google.common.math.MathTesting.POSITIVE_FINITE_DOUBLE_CANDIDATES;
import static org.junit.Assert.assertThrows;
import java.lang.reflect.Method;
import java.math.BigInteger;
import junit.framework.TestCase;
/**
* Tests for {@link DoubleUtils}.
*
* @author Louis Wasserman
*/
public class DoubleUtilsTest extends TestCase {
@AndroidIncompatible // no FpUtils and no Math.nextDown in old versions
public void testNextDown() throws Exception {
Method jdkNextDown = getJdkNextDown();
for (double d : FINITE_DOUBLE_CANDIDATES) {
assertEquals(jdkNextDown.invoke(null, d), DoubleUtils.nextDown(d));
}
}
private static Method getJdkNextDown() throws Exception {
try {
return Math.class.getMethod("nextDown", double.class);
} catch (NoSuchMethodException expectedBeforeJava8) {
return Class.forName("sun.misc.FpUtils").getMethod("nextDown", double.class);
}
}
@AndroidIncompatible // TODO(cpovirk): File bug for BigDecimal.doubleValue().
public void testBigToDouble() {
for (BigInteger b : ALL_BIGINTEGER_CANDIDATES) {
if (b.doubleValue() != DoubleUtils.bigToDouble(b)) {
failFormat(
"Converting %s to double: expected doubleValue %s but got bigToDouble %s",
b, b.doubleValue(), DoubleUtils.bigToDouble(b));
}
}
}
public void testEnsureNonNegative() {
assertEquals(0.0, DoubleUtils.ensureNonNegative(0.0));
for (double positiveValue : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
assertEquals(positiveValue, DoubleUtils.ensureNonNegative(positiveValue));
assertEquals(0.0, DoubleUtils.ensureNonNegative(-positiveValue));
}
assertEquals(Double.POSITIVE_INFINITY, DoubleUtils.ensureNonNegative(Double.POSITIVE_INFINITY));
assertEquals(0.0, DoubleUtils.ensureNonNegative(Double.NEGATIVE_INFINITY));
assertThrows(IllegalArgumentException.class, () -> DoubleUtils.ensureNonNegative(Double.NaN));
}
public void testOneBits() {
assertEquals(DoubleUtils.ONE_BITS, Double.doubleToRawLongBits(1.0));
}
private static void failFormat(String template, Object... args) {
fail(String.format(template, args));
}
}
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