OptionalEntity<CharMappingItem> result3 = charMappingFile.get(3L);
        assertFalse(result3.isPresent());
    }

    // Test selectList method with empty file
    public void test_selectList_emptyFile() throws Exception {
        // Write completely empty file
        try (java.io.FileWriter fw = new java.io.FileWriter(testFile)) {
            // Write nothing
        }