A simple class used to demostrate unit testing

Person.java

/** A simple class used to demonstrate unit testing. */
public class Person {
 protected String fullName;
 protected String firstName, lastName;
  /** Construct a Person using his/her first+last names. */
 public Person(String firstName, String lastName) {
 this.firstName = firstName;
 this.lastName = lastName;
 }
 /** Get the person's full name */
 public String getFullName( ) {
 if (fullName != null)
 return fullName;
 return firstName + " " + lastName;
 }
 /** Simple test program. */
 public static void main(String[] argv) {
 Person p = new Person("Ian", "Darwin");
 String f = p.getFullName( );
 if (!f.equals("Ian Darwin"))
 throw new IllegalStateException("Name concatenation broken");
 System.out.println("Fullname " + f + " looks good");
 }
}