diff --git a/tests/unit-tests/ca-memory.t.cpp b/tests/unit-tests/ca-memory.t.cpp
index 0dcbd03..9774610 100644
--- a/tests/unit-tests/ca-memory.t.cpp
+++ b/tests/unit-tests/ca-memory.t.cpp
@@ -37,11 +37,12 @@
   auto cert1 = key1.getDefaultCertificate();
 
   // add operation
-  CaState request1(Name("/ndn/site1"), "123", RequestType::NEW, Status::BEFORE_CHALLENGE, cert1, makeStringBlock(ndn::tlv::ContentType_Key, "PretendItIsAKey"));
+  RequestID requestId = {1,2,3,4,5,6,7,8};
+  CaState request1(Name("/ndn/site1"), requestId, RequestType::NEW, Status::BEFORE_CHALLENGE, cert1, makeStringBlock(ndn::tlv::ContentType_Key, "PretendItIsAKey"));
   BOOST_CHECK_NO_THROW(storage.addRequest(request1));
 
   // get operation
-  auto result = storage.getRequest("123");
+  auto result = storage.getRequest(requestId);
   BOOST_CHECK_EQUAL(request1.m_cert, result.m_cert);
   BOOST_CHECK(request1.m_status == result.m_status);
   BOOST_CHECK_EQUAL(request1.m_caPrefix, result.m_caPrefix);
@@ -51,11 +52,11 @@
   json.put("code", "1234");
 
   // update operation
-  CaState request2(Name("/ndn/site1"), "123", RequestType::NEW, Status::CHALLENGE, cert1,
+  CaState request2(Name("/ndn/site1"), requestId, RequestType::NEW, Status::CHALLENGE, cert1,
                    "email", "test", time::system_clock::now(), 3, time::seconds(3600),
                    std::move(json), makeStringBlock(ndn::tlv::ContentType_Key, "PretendItIsAKey"), 0);
   storage.updateRequest(request2);
-  result = storage.getRequest("123");
+  result = storage.getRequest(requestId);
   BOOST_CHECK_EQUAL(request2.m_cert, result.m_cert);
   BOOST_CHECK(request2.m_status == result.m_status);
   BOOST_CHECK_EQUAL(request2.m_caPrefix, result.m_caPrefix);
@@ -63,14 +64,15 @@
   auto identity2 = addIdentity(Name("/ndn/site2"));
   auto key2 = identity2.getDefaultKey();
   auto cert2 = key2.getDefaultCertificate();
-  CaState request3(Name("/ndn/site2"), "456", RequestType::NEW, Status::BEFORE_CHALLENGE, cert2, makeStringBlock(ndn::tlv::ContentType_Key, "PretendItIsAKey"));
+  RequestID requestId2 = {8,7,6,5,4,3,2,1};
+  CaState request3(Name("/ndn/site2"), requestId2, RequestType::NEW, Status::BEFORE_CHALLENGE, cert2, makeStringBlock(ndn::tlv::ContentType_Key, "PretendItIsAKey"));
   storage.addRequest(request3);
 
   // list operation
   auto allRequests = storage.listAllRequests();
   BOOST_CHECK_EQUAL(allRequests.size(), 2);
 
-  storage.deleteRequest("456");
+  storage.deleteRequest(requestId2);
   allRequests = storage.listAllRequests();
   BOOST_CHECK_EQUAL(allRequests.size(), 1);
 }