1 package com.google.common.math; 2 3 import static com.google.common.math.MathTesting.ALL_BIGINTEGER_CANDIDATES; 4 import static com.google.common.math.MathTesting.ALL_DOUBLE_CANDIDATES; 5 import static com.google.common.math.MathTesting.EXPONENTS; 6 import static com.google.common.math.MathTesting.FINITE_DOUBLE_CANDIDATES; 7 8 import java.math.BigInteger; 9 10 import junit.framework.TestCase; 11 import sun.misc.FpUtils; 12 13 public class DoubleUtilsTest extends TestCase { testScalbPositiveExponent()14 public strictfp void testScalbPositiveExponent() { 15 for (int k : EXPONENTS) { 16 for (double d : ALL_DOUBLE_CANDIDATES) { 17 assertEquals(d * StrictMath.pow(2.0, k), DoubleUtils.scalb(d, k)); 18 } 19 } 20 } 21 testGetExponent()22 public void testGetExponent() { 23 for (double d : ALL_DOUBLE_CANDIDATES) { 24 assertEquals(FpUtils.getExponent(d), DoubleUtils.getExponent(d)); 25 } 26 } 27 testNextUp()28 public void testNextUp() { 29 for (double d : FINITE_DOUBLE_CANDIDATES) { 30 assertEquals(FpUtils.nextUp(d), DoubleUtils.next(d, true)); 31 } 32 } 33 testNextDown()34 public void testNextDown() { 35 for (double d : FINITE_DOUBLE_CANDIDATES) { 36 assertEquals(FpUtils.nextDown(d), DoubleUtils.next(d, false)); 37 } 38 } 39 testBigToDouble()40 public void testBigToDouble() { 41 for (BigInteger b : ALL_BIGINTEGER_CANDIDATES) { 42 assertEquals(b.doubleValue(), DoubleUtils.bigToDouble(b)); 43 } 44 } 45 } 46