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/* ====================================================================
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.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import org.apache.poi.ss.util.NumberComparisonExamples.ComparisonExample;
import org.apache.poi.util.HexDump;
import org.junit.jupiter.api.Test;
/**
* Tests for {@link NumberComparer}
*/
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(success, "One or more cases failed. See stderr");
}
@Test
public void testRoundTripOnComparisonExamples() {
ComparisonExample[] examples = NumberComparisonExamples.getComparisonExamples();
for(int i=0;i<examples.length; i++) {
ComparisonExample ce = examples[i];
confirmRoundTrip(i, ce.getA());
confirmRoundTrip(i, ce.getNegA());
confirmRoundTrip(i, ce.getB());
confirmRoundTrip(i, ce.getNegB());
}
}
private void confirmRoundTrip(int i, double a) {
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;
assertNotEquals(a, b, 0.0);
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;
assertNotEquals(a, b, 0.0);
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 = Integer.compare(actRes, 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';
}
}
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