}

    // Test insert method
    @Test
    public void test_insert() throws Exception {
        writeTestFile("a,b => c\n");

        CharMappingItem newItem = new CharMappingItem(0, new String[] { "x", "y" }, "z");
        charMappingFile.insert(newItem);

        // Verify the item was added
        PagingList<CharMappingItem> result = charMappingFile.selectList(0, 10);
        assertEquals(2, result.size());

    }

    // Test insert method
    @Test
    public void test_insert() {
        loadTestData();

        StopwordsItem newItem = new StopwordsItem(0, "test");
        stopwordsFile.insert(newItem);

        // Verify the item was added
        boolean found = false;
        for (StopwordsItem item : stopwordsFile.stopwordsItemList) {

        item.setNewInput("");
        assertEquals("", item.toLineString());

        // Test with item created with id=0
        ProtwordsItem newItem = new ProtwordsItem(0, "newword");
        assertEquals("newword", newItem.toLineString());
    }

    @Test
    public void test_toLineString_withEmptyInput() {
        // Test toLineString with empty input