| /* ==================================================================== |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You 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 org.apache.poi.ss.util; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| |
| import org.apache.poi.ss.util.NumberComparisonExamples.ComparisonExample; |
| import org.apache.poi.util.HexDump; |
| import org.junit.Test; |
| /** |
| * Tests for {@link NumberComparer} |
| * |
| * @author Josh Micich |
| */ |
| public final class TestNumberComparer { |
| |
| @Test |
| public void testAllComparisonExamples() { |
| ComparisonExample[] examples = NumberComparisonExamples.getComparisonExamples(); |
| boolean success = true; |
| |
| for(int i=0;i<examples.length; i++) { |
| ComparisonExample ce = examples[i]; |
| success &= confirm(i, ce.getA(), ce.getB(), +ce.getExpectedResult()); |
| success &= confirm(i, ce.getB(), ce.getA(), -ce.getExpectedResult()); |
| success &= confirm(i, ce.getNegA(), ce.getNegB(), -ce.getExpectedResult()); |
| success &= confirm(i, ce.getNegB(), ce.getNegA(), +ce.getExpectedResult()); |
| } |
| |
| assertTrue("One or more cases failed. See stderr", success); |
| } |
| |
| @Test |
| public void testRoundTripOnComparisonExamples() { |
| ComparisonExample[] examples = NumberComparisonExamples.getComparisonExamples(); |
| boolean success = true; |
| for(int i=0;i<examples.length; i++) { |
| ComparisonExample ce = examples[i]; |
| success &= confirmRoundTrip(i, ce.getA()); |
| success &= confirmRoundTrip(i, ce.getNegA()); |
| success &= confirmRoundTrip(i, ce.getB()); |
| success &= confirmRoundTrip(i, ce.getNegB()); |
| } |
| |
| assertTrue("One or more cases failed. See stderr", success); |
| } |
| |
| private boolean confirmRoundTrip(int i, double a) { |
| return TestExpandedDouble.confirmRoundTrip(i, Double.doubleToLongBits(a)); |
| } |
| |
| /** |
| * The actual example from bug 47598 |
| */ |
| @Test |
| public void testSpecificExampleA() { |
| double a = 0.06-0.01; |
| double b = 0.05; |
| assertFalse(a == b); |
| assertEquals(0, NumberComparer.compare(a, b)); |
| } |
| |
| /** |
| * The example from the nabble posting |
| */ |
| @Test |
| public void testSpecificExampleB() { |
| double a = 1+1.0028-0.9973; |
| double b = 1.0055; |
| assertFalse(a == b); |
| assertEquals(0, NumberComparer.compare(a, b)); |
| } |
| |
| private static boolean confirm(int i, double a, double b, int expRes) { |
| int actRes = NumberComparer.compare(a, b); |
| |
| int sgnActRes = actRes < 0 ? -1 : actRes > 0 ? +1 : 0; |
| if (sgnActRes != expRes) { |
| System.err.println("Mismatch example[" + i + "] (" |
| + formatDoubleAsHex(a) + ", " + formatDoubleAsHex(b) + ") expected " |
| + expRes + " but got " + sgnActRes); |
| return false; |
| } |
| return true; |
| } |
| private static String formatDoubleAsHex(double d) { |
| long l = Double.doubleToLongBits(d); |
| return HexDump.longToHex(l)+'L'; |
| } |
| } |