/*
* Copyright 2013 Chris Pheby
*
* 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 org.jadira.quant.coremath;
import static org.junit.Assert.assertEquals;
import org.jadira.quant.api.QuantitativeFunction;
import org.jadira.quant.exception.IntervalBisectionOutOfRangeException;
import org.junit.Test;
public class TestIntervalBisection {
@Test
public void testIntervalBisection() {
IntervalBisection bisection = new IntervalBisection(0D, 2D);
Double result = bisection.apply(new QuantitativeFunction<Double, Double>() {
@Override
public Double apply(Double value) {
return 2 - Math.pow(Math.E, value);
}
});
assertEquals(0.693359375D, result, 0.0000000001D); // The approximate value for which 2 - e^value gives zero
}
@Test(expected=IntervalBisectionOutOfRangeException.class)
public void testOutOfRange() {
IntervalBisection bisection = new IntervalBisection(-3D, -1D);
Double result = bisection.apply(new QuantitativeFunction<Double, Double>() {
@Override
public Double apply(Double value) {
return 2 - Math.pow(Math.E, value);
}
});
assertEquals(0.693359375D, result, 0.0000000001D);
}
}