// GIVEN an invalid token for AUTH_DATA_PAC
        byte[] invalidToken = "invalid-pac-token".getBytes();

        // WHEN parsing the auth data
        // THEN a PACDecodingException should be thrown
        assertThrows(PACDecodingException.class, () -> {
            KerberosAuthData.parse(KerberosConstants.AUTH_DATA_PAC, invalidToken, mockKeys);
        }, "Parsing an invalid PAC token should throw a PACDecodingException.");