1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.math.util;
18  
19  import org.apache.commons.math.MathException;
20  
21  import junit.framework.TestCase;
22  
23  /**
24   * @version $Revision: 566841 $ $Date: 2007-08-16 13:43:44 -0700 (Thu, 16 Aug 2007) $
25   */
26  public class ContinuedFractionTest extends TestCase {
27      /**
28       * Constructor for ContinuedFractionTest.
29       * @param name
30       */
31      public ContinuedFractionTest(String name) {
32          super(name);
33      }
34  
35      public void testGoldenRatio(){
36          ContinuedFraction cf = new ContinuedFraction() {
37              private static final long serialVersionUID = 4696264881688589546L;
38  
39              public double getA(int n, double x) {
40                  return 1.0;
41              }
42  
43              public double getB(int n, double x) {
44                  return 1.0;
45              }
46          };
47          
48          try {
49              double gr = cf.evaluate(0.0, 10e-9);
50              assertEquals(1.61803399, gr, 10e-9);
51          } catch (MathException e) {
52              fail(e.getMessage());
53          }
54      }
55  }