@Test
    @DisplayName("Test Response interface methods - isVerifyFailed")
    void testIsVerifyFailed() {
        // Given
        when(response.isVerifyFailed()).thenReturn(false);

        // When
        boolean verifyFailed = response.isVerifyFailed();

        // Then
        assertFalse(verifyFailed);
        verify(response).isVerifyFailed();
    }

    @Test

    }

    @Test
    void testIsVerifyFailed() {
        // Simulate verification failed status
        when(mockResponse.isVerifyFailed()).thenReturn(true);
        assertTrue(mockResponse.isVerifyFailed());

        // Verify the method was called
        verify(mockResponse, times(1)).isVerifyFailed();
    }

    @Test
    void testIsError() {
        // Test initial state (should be false by default for a fresh mock)

            boolean result = echoResponse.verifySignature(buffer, 0, 100);

            assertTrue(result);
            assertFalse(echoResponse.isVerifyFailed());
            verify(mockDigest).verify(buffer, 0, 100, 0, echoResponse);
        }

        @Test
        @DisplayName("Should fail signature verification when digest verification fails")

     */
    boolean verifySignature(byte[] buffer, int i, int size);

    /**
     * Checks if signature verification failed.
     *
     * @return whether signature verification failed
     */
    boolean isVerifyFailed();

    /**
     * Checks if the response indicates an error.
     *
     * @return whether the response is an error
     */
    boolean isError();

    /**
     * Set error status
     */

            assertTrue(testBlock.isError());
        }

        @Test
        @DisplayName("Test verify failed state")
        void testVerifyFailedState() {
            assertFalse(testBlock.isVerifyFailed());
        }

        @Test
        @DisplayName("Test raw payload handling")
        void testRawPayloadHandling() {
            byte[] payload = new byte[] { 1, 2, 3, 4, 5 };

            boolean result = response.verifySignature(buffer, 0, 100);

            assertTrue(result);
            assertFalse(response.isVerifyFailed());
        }

        @Test
        @DisplayName("Should handle signature verification failure")
        void testVerifySignatureFailure() {
            byte[] buffer = new byte[100];

        }

        @Override
        public boolean verifySignature(byte[] buffer, int i, int size) {
            return true;
        }

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

        @Override
        public boolean isError() {
            return errorCode != 0;
        }

        @Override
        public void error() {

    public final int getErrorCode() {
        return getStatus();
    }

    /**
     *
     * @return whether signature verification failed
     */
    @Override
    public final boolean isVerifyFailed() {
        return this.verifyFailed;
    }

    /**
     * {@inheritDoc}
     *
     * @see jcifs.util.transport.Response#getGrantedCredits()
     */
    @Override

            }
            log.trace("VALIDATE_NEGOTIATE_INFO returned error", e);
            if (req.getResponse().isReceived() && req.getResponse().isVerifyFailed()
                    || e.getNtStatus() == NtStatus.NT_STATUS_ACCESS_DENIED) {
                // this is the signature error

            return this.grantedCredits;
        }

        @Override
        public int getErrorCode() {
            return this.errorCode;
        }

        @Override
        public boolean isVerifyFailed() {
            return this.verifyFailed;
        }

        @Override
        public boolean isError() {
            return this.error;
        }

        @Override