fix warnings

Change-Id: I23aa29d8cb2ddc77d86aee14c5e99f6c3945029b
diff --git a/tests/unit-tests/ca-module.t.cpp b/tests/unit-tests/ca-module.t.cpp
index e76677f..bd6828d 100644
--- a/tests/unit-tests/ca-module.t.cpp
+++ b/tests/unit-tests/ca-module.t.cpp
@@ -467,7 +467,7 @@
   signatureInfo.setValidityPeriod(security::ValidityPeriod(time::system_clock::now(),
                                                            time::system_clock::now() + time::hours(10)));
   m_keyChain.sign(clientCert, signingByKey(clientKey.getName()).setSignatureInfo(signatureInfo));
-  RequestId requestId = {1,2,3,4,5,6,7,8};
+  RequestId requestId = {{1,2,3,4,5,6,7,8}};
   std::array<uint8_t, 16> aesKey;
   RequestState certRequest(Name("/ndn"), requestId, RequestType::NEW, Status::SUCCESS, clientCert, std::move(aesKey));
   auto issuedCert = ca.issueCertificate(certRequest);