response.setFlagsForTest(0);

            assertFalse(response.isSigned());
        }

        @Test
        @DisplayName("Should verify signature successfully")
        void testVerifySignatureSuccess() {
            byte[] buffer = new byte[100];
            response.setDigest(mockDigest);
            when(mockDigest.verify(buffer, 0, 100, 0, response)).thenReturn(false);

    @DisplayName("Signature Verification Tests")
    class SignatureVerificationTests {

        @Test
        @DisplayName("Should verify signature when digest is present and successful")
        void testVerifySignatureSuccess() throws Exception {
            byte[] buffer = new byte[1024];
            echoResponse.setDigest(mockDigest);
            setStatus(echoResponse, NtStatus.NT_STATUS_SUCCESS);

            verify(mockDigest, never()).verify(any(), anyInt(), anyInt(), anyInt(), any());
        }

        @Test
        @DisplayName("Test verify signature success")
        void testVerifySignatureSuccess() {
            testBlock.setDigest(mockDigest);
            testBlock.setErrorCode(0);
            byte[] buffer = new byte[100];