assertEquals(expected, auth.isPreferredMech(oid));
    }

    static Object[][] preferredMechData_anonymous() {
        return new Object[][] { { NtlmContext.NTLMSSP_OID, true }, { Kerb5Context.SUPPORTED_MECHS[0], false } };
    }

    @ParameterizedTest(name = "anonymous preferred mech {0} -> {1}")
    @MethodSource("preferredMechData_anonymous")
    void isPreferredMech_anonymous(ASN1ObjectIdentifier oid, boolean expected) {