assertEquals("Not an NTLMSSP message.", thrown.getMessage());
        }

        @Test
        @DisplayName("Constructor with invalid message type should throw IOException")
        void testConstructor_ByteArray_InvalidMessageType() {
            // Given
            byte[] invalidType = new byte[100];
            System.arraycopy(Type2Message.NTLMSSP_SIGNATURE, 0, invalidType, 0, Type2Message.NTLMSSP_SIGNATURE.length);