| /* |
| * 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 junit.framework.TestCase; |
| |
| import sun.misc.FpUtils; |
| |
| import java.math.BigInteger; |
| |
| /** |
| * Tests for {@link DoubleUtils}. |
| * |
| * @author Louis Wasserman |
| */ |
| public class DoubleUtilsTest extends TestCase { |
| public void testNextDown() { |
| for (double d : FINITE_DOUBLE_CANDIDATES) { |
| assertEquals(FpUtils.nextDown(d), DoubleUtils.nextDown(d)); |
| } |
| } |
| |
| public void testBigToDouble() { |
| for (BigInteger b : ALL_BIGINTEGER_CANDIDATES) { |
| assertEquals(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)); |
| try { |
| DoubleUtils.ensureNonNegative(Double.NaN); |
| fail("Expected IllegalArgumentException from ensureNonNegative(Double.NaN)"); |
| } catch (IllegalArgumentException expected) { |
| } |
| } |
| } |