assertEquals("Empty file should have no pages", 0, result.getAllPageCount());
    }

    // Test selectList method with valid data
    @Test
    public void test_selectList_validData() throws Exception {
        writeTestFile("a,b => c\nd,e => f\ng,h => i\n");

        // Get all items
        PagingList<CharMappingItem> result1 = charMappingFile.selectList(0, 10);