1 /*
2 * DeDxFixed_Test.java
3 *
4 * Created on July 24, 2007, 10:08 PM
5 *
6 * $Id: DeDxFixed_Test.java,v 1.1.1.1 2010/04/08 20:38:00 jeremy Exp $
7 */
8
9 package org.lcsim.recon.tracking.trfeloss;
10
11 import junit.framework.TestCase;
12 import org.lcsim.recon.tracking.trfutil.Assert;
13
14 /**
15 *
16 * @author Norman Graf
17 */
18 public class DeDxFixed_Test extends TestCase
19 {
20 private boolean debug;
21 /** Creates a new instance of DeDxFixed_Test */
22 public void testDeDxFixed()
23 {
24 String component = "DeDxFixed";
25 String ok_prefix = component + " (I): ";
26 String error_prefix = component + " test (E): ";
27
28 if(debug) System.out.println( ok_prefix
29 + "---------- Testing component " + component
30 + ". ----------");
31
32 //********************************************************************
33
34 double pionMass = 0.13957;
35 double density = 3.0;
36 DeDx dedx = new DeDxFixed(density);
37 double thickness = 10.0;
38 double energy = 10.0;
39 double testenergy = energy;
40
41 double de_dx = dedx.dEdX(energy);
42 testenergy -= de_dx*thickness;
43 double finalenergy = dedx.loseEnergy(energy, thickness);
44 if(debug) System.out.println("energy= "+energy+", testenergy= "+testenergy+", finalenergy= "+finalenergy);
45 Assert.assertTrue(Math.abs(finalenergy-testenergy)<0.0001);
46
47 double gainenergy = dedx.loseEnergy(energy, -thickness);
48 if(debug) System.out.println("energy= "+energy+", gainenergy= "+gainenergy);
49 Assert.assertTrue( gainenergy > energy);
50
51
52 if(debug) System.out.println( ok_prefix
53 + "------------- All tests passed. -------------");
54 }
55
56 }