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Java > Open Source Codes > org > apache > commons > math > random > RandomAdaptorTest


1 /*
2  * Copyright 2005 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.commons.math.random;
17 import junit.framework.Test;
18 import junit.framework.TestSuite;
19 import java.util.Random JavaDoc;
20
21 /**
22  * Test cases for the RandomAdaptor class
23  *
24  * @version $Revision:$ $Date$
25  */
26
27 public class RandomAdaptorTest extends RandomDataTest {
28     
29     public RandomAdaptorTest(String JavaDoc name) {
30         super(name);
31     }
32     
33     public static Test suite() {
34         TestSuite suite = new TestSuite(RandomAdaptorTest.class);
35         suite.setName("RandomAdaptor Tests");
36         return suite;
37     }
38     
39     public void testAdaptor() {
40         ConstantGenerator generator = new ConstantGenerator();
41         Random JavaDoc random = RandomAdaptor.createAdaptor(generator);
42         checkConstant(random);
43         RandomAdaptor randomAdaptor = new RandomAdaptor(generator);
44         checkConstant(randomAdaptor);
45     }
46     
47     private void checkConstant(Random JavaDoc random) {
48         byte[] bytes = new byte[] {0};
49         random.nextBytes(bytes);
50         assertEquals(0, bytes[0]);
51         assertEquals(false, random.nextBoolean());
52         assertEquals(0, random.nextDouble(), 0);
53         assertEquals(0, random.nextFloat(), 0);
54         assertEquals(0, random.nextGaussian(), 0);
55         assertEquals(0, random.nextInt());
56         assertEquals(0, random.nextInt(1));
57         assertEquals(0, random.nextLong());
58         random.setSeed(100);
59         assertEquals(0, random.nextDouble(), 0);
60     }
61     
62     /*
63      * "Constant" generator to test Adaptor delegation.
64      * "Powered by Eclipse ;-)"
65      *
66      */
67     private class ConstantGenerator implements RandomGenerator {
68         
69         public boolean nextBoolean() {
70             return false;
71         }
72         
73         public void nextBytes(byte[] bytes) {
74         }
75
76         public double nextDouble() {
77             return 0;
78         }
79
80         public float nextFloat() {
81             return 0;
82         }
83
84         public double nextGaussian() {
85             return 0;
86         }
87
88         public int nextInt() {
89             return 0;
90         }
91
92         public int nextInt(int n) {
93             return 0;
94         }
95
96         public long nextLong() {
97             return 0;
98         }
99
100         public void setSeed(long seed) {
101         }
102     }
103 }
104
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