// Test with null input - should return empty string
        StopwordsItem item3 = new StopwordsItem(3, null);
        assertEquals("", item3.getInputValue());
    }

    public void test_isUpdated() {
        // Test isUpdated method
        StopwordsItem item = new StopwordsItem(1, "original");
        assertFalse(item.isUpdated());

        item.setNewInput("updated");
        assertTrue(item.isUpdated());

        // Test with null input - should return empty string
        ProtwordsItem item3 = new ProtwordsItem(3, null);
        assertEquals("", item3.getInputValue());
    }

    public void test_isUpdated() {
        // Test isUpdated method
        ProtwordsItem item = new ProtwordsItem(1, "word");
        assertFalse(item.isUpdated());

        item.setNewInput("newword");
        assertTrue(item.isUpdated());

        String[] emptyInputs = {};
        CharMappingItem emptyItem = new CharMappingItem(1L, emptyInputs, "output");
        assertEquals("", emptyItem.getInputsValue());
    }

    public void test_isUpdated() {
        String[] inputs = { "input" };
        CharMappingItem item = new CharMappingItem(1L, inputs, "output");

        // Initially not updated
        assertFalse(item.isUpdated());