still one error left

Change-Id: Id89dd6c85e02032b788d6cf97fc8b3ae9964b757
diff --git a/tests/unit-tests/challenge-credential.t.cpp b/tests/unit-tests/challenge-credential.t.cpp
index 8a301df..93a52d0 100644
--- a/tests/unit-tests/challenge-credential.t.cpp
+++ b/tests/unit-tests/challenge-credential.t.cpp
@@ -54,7 +54,9 @@
   auto keyA = identityA.getDefaultKey();
   auto certA = key.getDefaultCertificate();
   RequestId requestId = {1,2,3,4,5,6,7,8};
-  ca::RequestState state(Name("/example"), requestId, RequestType::NEW, Status::BEFORE_CHALLENGE, certA, makeEmptyBlock(ndn::tlv::ContentType_Key));
+  std::array<uint8_t, 16> aesKey;
+  ca::RequestState state(Name("/example"), requestId, RequestType::NEW,
+                         Status::BEFORE_CHALLENGE, certA, std::move(aesKey));
 
   // create requester's credential
   auto identityB = addIdentity(Name("/trust/cert"));