@Test
    public void test_get_emptyFile() throws Exception {
        writeTestFile("");

        OptionalEntity<CharMappingItem> result = charMappingFile.get(1L);
        assertFalse(result.isPresent());
    }

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

                "word1\n" + "  \n" + // whitespace line (may be treated as content)
                "# Another comment\n" + "word2\n";

        // Write content to test file
        writeTestFile(content);

        // Reload and verify
        protwordsFile.reload(null);

        PagingList<ProtwordsItem> result = protwordsFile.selectList(0, 10);
        // Whitespace-only lines may be treated as entries