setenv JUnitDIR /usr/local/junit
### CLASSPATH - environment variable for JAVA
setenv CLASSPATH .:$JUnitDIR/junit.jar

//----------- code for Latitude.java ----------
// Latitude class developed using Unit Testing and JUnit
// By Dan Hyde September 25, 2002

import javax.swing.*;

public class Latitude{
    private double deg;
    private double min;
    private double sec;
    private String hemi;  // hemisphere "N" or "S"

    public Latitude(){
	deg = 0.0;
	min = 0.0;
	sec = 0.0;
	hemi = "N";
    }

    public Latitude(double d, double m, double s, String h){
	deg = d;
	min = m;
	sec = s;
	hemi = h;
    }

    // more sophisticated than you need do!
    public boolean equals(Object anObject){
	if( !(anObject instanceof Latitude) ) // needs ()s after !
	    return false;
	Latitude aLatitude = (Latitude) anObject;
	if(deg == aLatitude.deg && min == aLatitude.min && 
	   sec == aLatitude.sec){
	    if(hemi.equals(aLatitude.hemi))
		return true;
	    if(deg == 0.0 && min == 0.0 && sec == 0.0)
		return true;
	}
	return false;
    }
}

//--------------- code for file LatitudeTest.java ------------
// LatitudeTest class for JUnit
// By Dan Hyde September 25, 2002, Update September 22, 2004
// Assumes Latitude class has a default constructor, a four argument
// constructor and an equals method.  Much missing of the final class!
// Enter "LatitudeTest" in field when you run "java test.ui.TestRunner"

import junit.framework.*;  // need to import test framework

public class LatitudeTest extends TestCase{

    private Latitude N0;
    private Latitude N90;

    public LatitudeTest(String name) { // need a constructor with String arg 
        super(name);
    }

    protected void setUp(){

	N0 = new Latitude();
	N90 = new Latitude(90.0, 0.0, 0.0, "N");
    }

    public void testLatitudeConst(){

        // O degrees N from default constructor should equal 
        // 0 degrees N from 4 arg constructor
	Latitude N0expected = new Latitude(0.0, 0.0, 0.0, "N");

	// To check if true use	assertTrue()
	// DONT'T use assert() which is in old articles!
	assertTrue( N0.equals( N0expected ) );

        // 0 degrees N should be equal to 0 degrees S.
	Latitude S0expected = new Latitude(0.0, 0.0, 0.0, "S");

	// To check if equal use assertEquals()
	assertEquals( N0, S0expected );
    }

    public static Test suite(){
	TestSuite suite = new TestSuite();
	suite.addTest( new LatitudeTest("testLatitudeConst") );
	return suite;
    }
}

    altair{224}% javac Latitude.java

    altair{225}% javac LatitudeTest.java

    altair{226}% java junit.textui.TestRunner LatitudeTest

    altair{227}%java junit.swingui.TestRunner LatitudeTest

Note that you need two files - one with the class you are developing and the second class for the unit tests.