assertEquals("Test if count of item are equal", set.getItemCount(), 5);
assertTrue("Test if item was added", set.addItem(2, 1, d));
assertEquals("Test if count of item are equal", set.getItemCount(), 6);
assertTrue("Test if item was added", set.addItem(1, 1, eof));
assertEquals("Test if count of item are equal", set.getItemCount(), 6);
assertTrue("Test if item was added", !set.addItem(1, 1, d));
assertEquals("Test if count of item are equal", set.getItemCount(), 6);