@Test
    public void test_hashCode() {
        // Test hashCode method
        StopwordsItem item1 = new StopwordsItem(1, "test");
        StopwordsItem item2 = new StopwordsItem(1, "test");
        StopwordsItem item3 = new StopwordsItem(2, "test");
        StopwordsItem item4 = new StopwordsItem(1, "different");

        // Same input should have same hashCode regardless of id
        assertEquals(item1.hashCode(), item2.hashCode());

    public void test_updater_updateItem() {
        loadTestData();

        StopwordsItem originalItem = stopwordsFile.get(1).get();
        StopwordsItem updateItem = new StopwordsItem(1, "the");
        updateItem.setNewInput("modified");

        StopwordsFile.StopwordsUpdater updater = stopwordsFile.new StopwordsUpdater(updateItem);

        StopwordsItem result = updater.write(originalItem);
        assertNotNull(result);