1 /* 2 * Copyright (C) 2011 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.math; 18 19 import static com.google.common.math.MathTesting.ALL_BIGINTEGER_CANDIDATES; 20 import static com.google.common.math.MathTesting.FINITE_DOUBLE_CANDIDATES; 21 import static com.google.common.math.MathTesting.POSITIVE_FINITE_DOUBLE_CANDIDATES; 22 23 import junit.framework.TestCase; 24 25 import sun.misc.FpUtils; 26 27 import java.math.BigInteger; 28 29 /** 30 * Tests for {@link DoubleUtils}. 31 * 32 * @author Louis Wasserman 33 */ 34 public class DoubleUtilsTest extends TestCase { 35 public void testNextDown() { 36 for (double d : FINITE_DOUBLE_CANDIDATES) { 37 assertEquals(FpUtils.nextDown(d), DoubleUtils.nextDown(d)); 38 } 39 } 40 41 public void testBigToDouble() { 42 for (BigInteger b : ALL_BIGINTEGER_CANDIDATES) { 43 assertEquals(b.doubleValue(), DoubleUtils.bigToDouble(b)); 44 } 45 } 46 47 public void testEnsureNonNegative() { 48 assertEquals(0.0, DoubleUtils.ensureNonNegative(0.0)); 49 for (double positiveValue : POSITIVE_FINITE_DOUBLE_CANDIDATES) { 50 assertEquals(positiveValue, DoubleUtils.ensureNonNegative(positiveValue)); 51 assertEquals(0.0, DoubleUtils.ensureNonNegative(-positiveValue)); 52 } 53 assertEquals(Double.POSITIVE_INFINITY, DoubleUtils.ensureNonNegative(Double.POSITIVE_INFINITY)); 54 assertEquals(0.0, DoubleUtils.ensureNonNegative(Double.NEGATIVE_INFINITY)); 55 try { 56 DoubleUtils.ensureNonNegative(Double.NaN); 57 fail("Expected IllegalArgumentException from ensureNonNegative(Double.NaN)"); 58 } catch (IllegalArgumentException expected) { 59 } 60 } 61 } 62
