Example usage of the expected attribute of the org.junit.Test annotation

JunitTestAnnotationWithExpectedExample.java

@Test(expected=ServiceException.class)
public void cannotCreateUserWithSameUsername() throws ServiceException {
   User user1 = new User("Jane", "Smith", "jsmith", "venus");
   User user2 = new User("John", "Smith", "jsmith", "mars");
   AuctionService service = null;
   try {
      service = new BaseAuctionService();
      service.saveUser(user1);
   } catch (ServiceException e) {
      fail( e.getMessage() );
   }
   service.saveUser(user2);   // this should throw ServiceException
}