Question

public String createUser() {

    Session session = HibernateUtility.getSession();
    Transaction tx = session.beginTransaction();

    session.save(this);
    tx.commit();
    session.close();

    return "accountCreated";

}

How to write Unit test case for this method?

Answer 1

It is difficult to unit test code which contains calls to static methods, like HibernateUtility.getSession().

You might consider injecting the Session instance (perhaps by adding a parameter to the createUser() method, or by giving the object that contains this method a Session Factory object which it can use to obtain Session instances). You could then use Mockito or a similar framework to provide a mock Session object to the method, and verify that the expected calls where being made to it.

public String createUser(Session session) {
    Transaction tx = session.beginTransaction();

    session.save(this);
    tx.commit();
    session.close();

    return "accountCreated";
}

Using Mockito, a unit test might look like this:

public testCreateUser(){
    Session session = mock(Session.class);
    Transaction trans = mock(Transaction.class);

    when(session.beginTransaction()).thenReturn(trans);

    obj.createUser(session);

    verify(session).save(obj);
    verify(session).close();
    verify(trans).commit();
}