// Tests whether an iterator's next method throws
    // a NoSuchElementException

    private void catchNoSuchElementException (String name, Iterator it) {
        boolean result = true;
        try {
            it.next();
            result = false;       // this should not happen
        }
        catch (NoSuchElementException e) {
            result = true;        // this should happen
        }
        catch (Exception e) {
            result = false;       // this should not happen
        }
        finally {
            assertTrue (name, result);
        }
    }