How do you test that an Iterator/ListIterator works?

I have an implemenation of a single linked, linked list. I have written a ListIterator for this class. How can I test that my implementation for the ListIterator works? So far I have used a for-each loop on an instance of my linked list, which works. In what other ways do I need to test it?

Usually, you want to test all the edge cases in addition to the "normal" case. Maybe:

• test with an empty list
• test with some nulls in
• test an exception is thrown if hasNext() returns false and you try to fetch another element
• test remove()
• test remove() when removing the last element
• test calling remove() twice throws an exception

etc..