assertThrows(PACDecodingException.class, () -> {
            unicodeString.check("WRONGLENGTH");
        });
    }

    @Test
    @DisplayName("Test empty arrays using mock")
    void testEmptyOptionalFields() throws Exception {
        PacLogonInfo logonInfo = mock(PacLogonInfo.class);

        // Setup to return empty arrays
        when(logonInfo.getGroupSids()).thenReturn(new SID[0]);