| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * 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.hp.creals; |
| |
| import junit.framework.AssertionFailedError; |
| import junit.framework.TestCase; |
| |
| import java.util.Random; |
| |
| public class ConversionTest extends TestCase { |
| private static void check(boolean x, String s) { |
| if (!x) throw new AssertionFailedError(s); |
| } |
| final static int NRANDOM = 100; // Number of random values to |
| // test. Bigger ==> slower |
| final CR BIG = CR.valueOf(Double.MAX_VALUE); |
| final CR HUGE = BIG.multiply(BIG); |
| final CR TINY = CR.ONE.shiftRight(1078); |
| |
| public void checkDoubleConversion(double x) { |
| if (!Double.isNaN(x) && !Double.isInfinite(x)) { |
| CR crValue = CR.valueOf(x); |
| check(x == crValue.doubleValue(), "double conversion: " + x); |
| } |
| } |
| |
| public void checkFloatConversion(float f) { |
| if (!Float.isNaN(f) && !Float.isInfinite(f)) { |
| CR crValue = CR.valueOf(f); |
| check(f == crValue.floatValue(), "float conversion: " + f); |
| } |
| } |
| |
| public void checkNearbyConversions(double x) { |
| checkDoubleConversion(x); |
| checkDoubleConversion(Math.nextAfter(x, Double.NEGATIVE_INFINITY)); |
| checkDoubleConversion(Math.nextAfter(x, Double.POSITIVE_INFINITY)); |
| float f = (float)x; |
| checkFloatConversion(f); |
| checkFloatConversion(Math.nextAfter(f, Double.NEGATIVE_INFINITY)); |
| checkFloatConversion(Math.nextAfter(f, Double.POSITIVE_INFINITY)); |
| } |
| |
| public void testConversions() { |
| check(TINY.doubleValue() == 0.0d, "Tiny.doubleValue()"); |
| checkNearbyConversions(0.0d); |
| checkNearbyConversions(Double.MAX_VALUE); |
| checkNearbyConversions(Double.MIN_VALUE); |
| check(HUGE.doubleValue() == Double.POSITIVE_INFINITY, |
| "double +infinity"); |
| check(HUGE.negate().doubleValue() == Double.NEGATIVE_INFINITY, |
| "double -infinity"); |
| check(HUGE.floatValue() == Float.POSITIVE_INFINITY, |
| "float +infinity"); |
| check(HUGE.negate().floatValue() == Float.NEGATIVE_INFINITY, |
| "float -infinity"); |
| for (double x = 1.0d; x != 0.0d; x /= 2.0d) { |
| checkNearbyConversions(x); |
| } |
| for (double x = -1.0d; x != Double.NEGATIVE_INFINITY; x *= 2.0d) { |
| checkNearbyConversions(x); |
| } |
| Random r = new Random(); // Random seed! |
| for (int i = 0; i < NRANDOM; ++i) { |
| double d = Math.exp(1000.0 * r.nextDouble()); |
| if (r.nextBoolean()) d = -d; |
| checkNearbyConversions(d); |
| } |
| } |
| } |