Java - how do i write a test case for java application, Junit ???

OK. As Yan's help, I almost finish 50% of my work, now I need to the best way how to write a test case in java. My lecture mentioned about Junit, but this is only for J2EE web-based application only. I think.
for me, just a simple schooladdressbook application, please give me some idea how to do it. gave me a good example, would be very very appreicated. Yan, I hope you can help me for this as well as you help me from the very beginnning.
unistudentAsked:
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mccarlIT Business Systems Analyst / Software DeveloperCommented:
JUnit, is NOT just for J2EE

I would suggest you look at using it, it is quite commonly used. If you are using an IDE, it can probably create the template test class for you. You would need to provide a bit more detail about your code, the sort of tests that you want to do, your environment/IDE for me to help much further.

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unistudentAuthor Commented:
Thanks for the tips.
For example, I have a Java application in which have a method to remove the duplicate record from the ArrayList, how do i write a Junit for this. There are two main methods defined in the Java Main program like below. My problem is I dont know how to create a Junit to test for sort and remove duplicate functions. Please advise. example codes are very much appreicated.

public class SchoolAddressBook {

  public SchoolAddressBook(ArrayList<Contact> ar){
        this.ar = ar;
    }


  void sortSchoolAddressBook() {
        Collections.sort(ar);
    }

  void removeDuplicates() {
             ArrayList<Contact> ar1 = new ArrayList<Contact>();
              for(Contact c : ar){
                  if(!ar1.contains(c))ar1.add(c);
              }
              ar = ar1;
          }


   public static void main (String args[]) {
mccarlIT Business Systems Analyst / Software DeveloperCommented:
You would create a separate class to the above that looks something like this...


public class SchoolAddressBookTest {
  @Test
  public void testSorting {
    List<Contact> testList = new ArrayList<Contact>();
    testList.add(new Contact(.....));   // Fill in some test data here
    testList.add(new Contact(.....));   // Fill in some test data here
    testList.add(new Contact(.....));   // Fill in some test data here

    SchoolAddressBook testAddrBook = new SchoolAddressBook(testList);

    testAddrBook.sortSchoolAddressBook();

    assertEquals("Addison", testAddrBook.get(0).getName);  // Change this to whatever method you have of retrieving the first contact's name
    assertEquals("Brown", testAddrBook.get(1).getName);  // Change this to whatever method you have of retrieving the second contact's name
    assertEquals("Cochrane", testAddrBook.get(2).getName);  // Change this to whatever method you have of retrieving the third contact's name
  }

  @Test
  public void testDuplicateRemoval {
    // Do similar to the above but load the testList with duplicates and 'assert' that they have been removed after calling the removeDuplicates() method
  }
}

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And include junit jar's and add appropriate import statements. Then depending on your environment/IDE, you should be able to execute this class as a junit test.
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