// Initially, rawPayload should be null
        assertNull(message.getRawPayload(), "rawPayload should be null initially");

        // Set a new payload and verify
        byte[] payload1 = "test_payload_1".getBytes();
        message.setRawPayload(payload1);
        assertArrayEquals(payload1, message.getRawPayload(), "getRawPayload should return the set payload");

        // Set another payload and verify

            assertNull(testBlock.getRawPayload());
            assertFalse(testBlock.isRetainPayload());

            testBlock.retainPayload();
            assertTrue(testBlock.isRetainPayload());

            testBlock.setRawPayload(payload);
            assertArrayEquals(payload, testBlock.getRawPayload());
        }
    }

    @Nested

            this.retainPayload = retainPayload;
        }

        @Override
        public void setRawPayload(byte[] payload) {
            this.rawPayload = payload;
        }

        public byte[] getRawPayload() {
            return rawPayload;
        }

        // Helper method to set credit since parent's setter is final
        public void setCreditForTest(int credit) {
            setCredit(credit);
        }

            this.retainPayload = true;
        }

        @Override
        public boolean isRetainPayload() {
            return retainPayload;
        }

        @Override
        public byte[] getRawPayload() {
            return rawPayload;
        }

        @Override
        public void setRawPayload(byte[] rawPayload) {
            this.rawPayload = rawPayload;
        }
    }

    /**

     */
    boolean isRetainPayload();

    /**
     * Gets the raw payload of the message.
     *
     * @return the raw response message
     */
    byte[] getRawPayload();

    /**
     * Sets the raw payload of the message.
     *
     * @param rawPayload the raw message payload to set
     */
    void setRawPayload(byte[] rawPayload);

            return true; // Default to successful verification
        }

        public void setRetainPayload(boolean retain) {
            this.retainPayload = retain;
        }

        public byte[] getRawPayload() {
            return rawPayload;
        }

        // Expose headerStart for testing
        public int getHeaderStart() {
            return headerStart;
        }
    }

    /**

        @DisplayName("Should get and set raw payload")
        void testRawPayload() {
            assertNull(testMessage.getRawPayload());
            byte[] payload = new byte[] { 1, 2, 3, 4, 5 };
            testMessage.setRawPayload(payload);
            assertArrayEquals(payload, testMessage.getRawPayload());
        }
    }

    @Nested
    @DisplayName("Error Data Tests")
    class ErrorDataTests {

        public void retainPayload() {
        }

        @Override
        public boolean isRetainPayload() {
            return false;
        }

        @Override
        public byte[] getRawPayload() {
            return null;
        }

        @Override
        public void setRawPayload(byte[] rawPayload) {
        }
    }

                    byte[] reqBytes = request.getRawPayload();
                    this.preauthIntegrityHash = trans.calculatePreauthHash(reqBytes, 0, reqBytes.length, this.preauthIntegrityHash);

                    if (response.getStatus() == NtStatus.NT_STATUS_MORE_PROCESSING_REQUIRED) {
                        byte[] respBytes = response.getRawPayload();

            @Override
            public void setRawPayload(byte[] rawPayload) {
                // Implementation for raw payload
            }

            @Override
            public byte[] getRawPayload() {
                // Implementation for getting raw payload
                return null;
            }

            @Override
            public boolean isRetainPayload() {