assertArrayEquals(new byte[] { 0x42 }, parsed.getMechanismToken(), "Should parse token");
        });
    }

    @Test
    @DisplayName("Parse rejects unknown nested token field")
    void testParseRejectsUnknownField() throws Exception {
        ASN1TaggedObject unknown = new DERTaggedObject(true, 7, new DEROctetString(new byte[] { 0x01 }));