writeTestFile("# This is a comment\n\na,b => c\n\n# Another comment\nd,e => f\n");

        PagingList<CharMappingItem> result = charMappingFile.selectList(0, 10);
        assertEquals(2, result.size());
    }

    // Test reload with invalid format
    public void test_reload_invalidFormat() throws Exception {
        writeTestFile("a,b => c\ninvalid_line\nd,e => f\n");

        // Should skip invalid line