message: added additional check to test
diff: @@ -722,8 +722,9 @@ mod tests {
  let my_key_for_decrypt = their_key.clone();
  let their_did_for_encrypt = Did::new(their_did.did, their_did.verkey);
  let encrypted_message = service.authenticated_encrypt(&my_key_for_encrypt, &their_did_for_encrypt.verkey, msg.as_bytes()).unwrap();
  - let (their_vk, decrypted_message) = service.authenticated_decrypt(&my_key_for_decrypt, &their_did_for_decrypt.verkey, &encrypted_message).unwrap();
  + let (their_vk, decrypted_message) = service.authenticated_decrypt(&my_key_for_decrypt,&encrypted_message).unwrap();
  assert_eq!(msg.as_bytes().to_vec(), decrypted_message);
  + assert_eq!(&their_vk, &their_did_for_encrypt.verkey);
  }
  }
  \ No newline at end of file
  