public class IPhListTest { 
  public IPhListTest () {}

  // Setup:
  // Phone entries:
  PhEntry wendy = new PhEntry("wendy", 1234); 
  PhEntry dan = new PhEntry("dan", 8768); 
  PhEntry pat = new PhEntry("pat", 6389); 
  PhEntry matt = new PhEntry("matt", 7999); 
  PhEntry judy = new PhEntry("judy", 1833); 
  PhEntry erna = new PhEntry("erna", 3325); 

  // Phone lists:
  IPhList imt = new MtPhList();
  PhList mt = new PhList(imt); 


//run the tests and report the results
  public void runTests(){ 

    // test the method remove
    // Setup: construct a list with "dan" in it
    System.out.println("\nObserving the effects of remove and add methods: \n");
    IPhList imattlist = new ConsPhList(wendy, 
        new ConsPhList(dan, 
            new ConsPhList(pat,imt)));
    PhList mattlist = new PhList(imattlist);
    System.out.println("\nOriginal list with Dan in it: \n" + mattlist);

    // remove "dan" from the list
    mattlist.remove("dan");

    // observe the effect:
    System.out.println("\nList with Dan removed: \n" + mattlist);

    // remove "pat" from the list
    mattlist.remove("pat");
    System.out.println("\nList with Pat (and Dan) removed: \n" + mattlist);

//  add "pat" back to the list
    mattlist.add(pat);
    System.out.println("\nList with Pat (and Dan) removed " + 
        "and Pat added back in: \n" + mattlist);

    // test the method remove - again
    // Setup: construct a list with "dan" in it
    System.out.println("\nObserving the effects of remove and add methods: \n");
    IPhList idanlist = new ConsPhList(matt, 
        new ConsPhList(judy, 
            new ConsPhList(erna,imt))); 
    PhList danlist = new PhList(idanlist);
    System.out.println("\nOriginal list with Judy in it: \n" + danlist);

    // remove "judy" from the list
    danlist.remove("judy");

    // observe the effect:
    System.out.println("\nList with Judy removed: \n" + danlist);

    // remove "erna" from the list
    danlist.remove("erna");
    System.out.println("\nList with Erna (and Judy) removed: \n" + danlist);

    // remove "matt" from the list
    danlist.remove("matt");
    System.out.println("\nList with Matt (and Erna and Judy) removed: \n" 
        + danlist);

  } 

  public static void main(String[] argv){ 
    IPhListTest phlt = new IPhListTest(); 
    phlt.runTests(); 
  } 
}