assertNull(parsed.getMechanismListMIC(), "Non-Octet MIC in tag [3] should be ignored");
    }

    @Test
    @DisplayName("Context flags encode as DER BIT STRING and parse back")
    void testContextFlagsRoundTripViaAsn1() throws Exception {
        int flags = NegTokenInit.ANONYMITY | NegTokenInit.CONFIDENTIALITY | NegTokenInit.SEQUENCE_CHECKING;