1 /*
2 * RandomGenerator_Test.java
3 *
4 * Created on July 24, 2007, 11:21 AM
5 *
6 * $Id: RandomGenerator_Test.java,v 1.1.1.1 2010/04/08 20:38:00 jeremy Exp $
7 */
8
9 package org.lcsim.recon.tracking.trfutil;
10
11 import java.util.ArrayList;
12 import java.util.Iterator;
13 import java.util.List;
14 import junit.framework.TestCase;
15
16 /**
17 *
18 * @author Norman Graf
19 */
20 public class RandomGenerator_Test extends TestCase
21 {
22 private boolean debug;
23 /** Creates a new instance of RandomGenerator_Test */
24 public void testRandomGenerator()
25 {
26 String component = "RandomGenerator";
27 String ok_prefix = component + " (I): ";
28 String error_prefix = component + " test (E): ";
29
30 if(debug) System.out.println( ok_prefix
31 + "---------- Testing component " + component
32 + ". ----------" );
33
34 //********************************************************************
35
36 // Verify that each generated value is different and is in range.
37 if(debug) System.out.println( ok_prefix + "Test default sequence." );
38 double min = 2.0;
39 double max = 5.0;
40 long seed = 246813579L;
41 RandomGeneratorTest rgen = new RandomGeneratorTest(min,max);
42 if(debug) System.out.println( rgen );
43 int ntest = 20;
44 int itest;
45 List values = new ArrayList();
46 Iterator ival;
47 for ( itest=0; itest<ntest; ++itest )
48 {
49 double newval;
50 if ( itest == 4 || itest == 6 || itest == 7 ) newval = rgen.gauss();
51 else newval = rgen.flat();
52 if(debug) System.out.println( newval );
53 for ( ival=values.iterator(); ival.hasNext();)
54 {
55 Assert.assertTrue( newval != ((Double) ival.next()).doubleValue() );
56 }
57 if ( itest != 4 && itest != 6 && itest != 7 )
58 {
59 Assert.assertTrue( newval >= min );
60 Assert.assertTrue( newval <= max );
61 }
62 values.add(new Double(newval));
63 }
64
65 //********************************************************************
66
67 // Verify that two generators starting with the same seed give the
68 // same values.
69 if(debug) System.out.println( ok_prefix + "Test sequence with seed." );
70 rgen.setSeed(seed);
71 RandomGeneratorTest rgen2 = new RandomGeneratorTest(min,max,seed);
72 for ( itest=0; itest<ntest; ++itest )
73 {
74 RandomGeneratorTest rgen3 = new RandomGeneratorTest(rgen);
75
76 double newval;
77 double newval2;
78 double newval3;
79 if ( itest == 4 || itest == 6 || itest == 7 )
80 {
81 newval = rgen.gauss();
82 newval2 = rgen2.gauss();
83 newval3 = rgen3.gauss();
84 }
85 else
86 {
87 newval = rgen.flat();
88 newval2 = rgen2.flat();
89 newval3 = rgen3.flat();
90 }
91 if(debug) System.out.println( newval + " " + newval2 + " " + newval3 );
92 Assert.assertTrue( newval == newval2 );
93 }
94
95 //********************************************************************
96
97 if(debug) System.out.println( ok_prefix + "Test copy constructor." );
98 // Note that rgen is not at the beginning of its sequence.
99 // Copying the state should copy the seed and invoke the
100 // appropriate number of calls so the next value will be
101 // the same for both objects.
102 RandomGeneratorTest rgen3 = new RandomGeneratorTest(rgen);
103 for ( itest=0; itest<ntest; ++itest )
104 {
105 double newval;
106 double newval2;
107 if ( itest == 4 || itest == 6 || itest == 7 )
108 {
109 newval = rgen.gauss();
110 newval2 = rgen3.gauss();
111 }
112 else
113 {
114 newval = rgen.flat();
115 newval2 = rgen3.flat();
116 }
117 if(debug) System.out.println( newval + " " + newval2 );
118 Assert.assertTrue( newval == newval2 );
119 }
120
121 //********************************************************************
122
123 if(debug) System.out.println( ok_prefix + "Test copying state." );
124 rgen.setSeed(seed);
125 RandomGeneratorTest rgen4 = new RandomGeneratorTest(min,max);
126 rgen4.setState(rgen);
127 for ( itest=0; itest<ntest; ++itest )
128 {
129 double newval;
130 double newval2;
131 if ( itest == 4 || itest == 6 || itest == 7 )
132 {
133 newval = rgen.gauss();
134 newval2 = rgen4.gauss();
135 }
136 else
137 {
138 newval = rgen.flat();
139 newval2 = rgen4.flat();
140 }
141 if(debug) System.out.println( newval + ' ' + newval2 );
142 Assert.assertTrue( newval == newval2 );
143 }
144
145 //********************************************************************
146
147 if(debug) System.out.println( ok_prefix
148 + "------------- All tests passed. -------------" );
149 //********************************************************************
150 }
151
152 }