diff --git a/tests/unit-tests/challenge-email.t.cpp b/tests/unit-tests/challenge-email.t.cpp
index c53e47e..ad3ef83 100644
--- a/tests/unit-tests/challenge-email.t.cpp
+++ b/tests/unit-tests/challenge-email.t.cpp
@@ -30,7 +30,7 @@
 BOOST_AUTO_TEST_CASE(TestChallengeType)
 {
   ChallengeEmail challenge;
-  BOOST_CHECK_EQUAL(challenge.CHALLENGE_TYPE, "EMAIL");
+  BOOST_CHECK_EQUAL(challenge.CHALLENGE_TYPE, "Email");
 }
 
 BOOST_AUTO_TEST_CASE(ParseStoredSecret)
@@ -75,7 +75,7 @@
   challenge.handleChallengeRequest(interest, request);
 
   BOOST_CHECK_EQUAL(request.getStatus(), ChallengeEmail::NEED_CODE);
-  BOOST_CHECK_EQUAL(request.getChallengeType(), "EMAIL");
+  BOOST_CHECK_EQUAL(request.getChallengeType(), "Email");
 }
 
 BOOST_AUTO_TEST_CASE(OnSelectInterestComingWithInvalidEmail)
@@ -99,7 +99,7 @@
   challenge.handleChallengeRequest(interest, request);
 
   BOOST_CHECK_EQUAL(request.getStatus(), ChallengeEmail::FAILURE_INVALID_EMAIL);
-  BOOST_CHECK_EQUAL(request.getChallengeType(), "EMAIL");
+  BOOST_CHECK_EQUAL(request.getChallengeType(), "Email");
 }
 
 BOOST_AUTO_TEST_CASE(OnValidateInterestComingWithCode)
diff --git a/tests/unit-tests/json-helper.t.cpp b/tests/unit-tests/json-helper.t.cpp
index 266d3ee..b089e4e 100644
--- a/tests/unit-tests/json-helper.t.cpp
+++ b/tests/unit-tests/json-helper.t.cpp
@@ -67,11 +67,12 @@
   BOOST_CHECK_EQUAL(result.get<std::string>(JSON_CERTIFICATE), "/ndn/test");
 }
 
-BOOST_AUTO_TEST_CASE(GenerateErrorJson)
+BOOST_AUTO_TEST_CASE(GenerateFailureJson)
 {
-  auto result = genErrorJson("The certificate name already exists");
-  BOOST_CHECK_EQUAL(result.get<std::string>(JSON_STATUS), "error");
-  BOOST_CHECK_EQUAL(result.get<std::string>(JSON_ERROR_INFO),
+  auto result = genFailureJson("598234759", "EMAIL", "failure",
+                               "The certificate name already exists");
+  BOOST_CHECK_EQUAL(result.get<std::string>(JSON_STATUS), "failure");
+  BOOST_CHECK_EQUAL(result.get<std::string>(JSON_FAILURE_INFO),
                     "The certificate name already exists");
 }