}

        // Message interface methods
        @Override
        public boolean isRetainPayload() {
            return this.retainPayload;
        }

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

        @Override
        public boolean verifySignature(byte[] buffer, int i, int size) {
            // Mock implementation

        this.length = len;

        if (isRetainPayload()) {
            final byte[] payload = new byte[len];
            System.arraycopy(buffer, 4, payload, 0, len);
            setRawPayload(payload);
        }

        if (!verifySignature(buffer, 4, len)) {
            throw new SMBProtocolDecodingException("Signature verification failed for " + this.getClass().getName());
        }

        return this.retainPayload;
    }

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

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

    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.CommonServerMessageBlock#getDigest()
     */
    @Override

            assertFalse(testBlock.isRetainPayload());

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

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

    @Nested
    @DisplayName("Response Management Tests")
    class ResponseManagementTests {

        @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 {

        @Test