001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     * 
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     * 
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.math.util;
018    
019    import org.apache.commons.math.MathException;
020    
021    import junit.framework.TestCase;
022    
023    /**
024     * @version $Revision: 778522 $ $Date: 2009-05-25 18:24:50 -0400 (Mon, 25 May 2009) $
025     */
026    public class ContinuedFractionTest extends TestCase {
027        /**
028         * Constructor for ContinuedFractionTest.
029         * @param name
030         */
031        public ContinuedFractionTest(String name) {
032            super(name);
033        }
034    
035        public void testGoldenRatio(){
036            ContinuedFraction cf = new ContinuedFraction() {
037                
038                @Override
039                public double getA(int n, double x) {
040                    return 1.0;
041                }
042    
043                @Override
044                public double getB(int n, double x) {
045                    return 1.0;
046                }
047            };
048            
049            try {
050                double gr = cf.evaluate(0.0, 10e-9);
051                assertEquals(1.61803399, gr, 10e-9);
052            } catch (MathException e) {
053                fail(e.getMessage());
054            }
055        }
056    }