diff --git a/tests/unit-tests/challenge-email.t.cpp b/tests/unit-tests/challenge-email.t.cpp
index d996d4a..61bcd45 100644
--- a/tests/unit-tests/challenge-email.t.cpp
+++ b/tests/unit-tests/challenge-email.t.cpp
@@ -20,11 +20,14 @@
 
 #include "challenge/challenge-email.hpp"
 
-#include "test-common.hpp"
+#include "tests/boost-test.hpp"
+#include "tests/key-chain-fixture.hpp"
+
+#include <fstream>
 
 namespace ndncert::tests {
 
-BOOST_FIXTURE_TEST_SUITE(TestChallengeEmail, IdentityManagementFixture)
+BOOST_FIXTURE_TEST_SUITE(TestChallengeEmail, KeyChainFixture)
 
 BOOST_AUTO_TEST_CASE(ChallengeType)
 {
@@ -41,7 +44,7 @@
 
 BOOST_AUTO_TEST_CASE(OnChallengeRequestWithEmail)
 {
-  auto identity = addIdentity(Name("/ndn/site1"));
+  auto identity = m_keyChain.createIdentity(Name("/ndn/site1"));
   auto key = identity.getDefaultKey();
   auto cert = key.getDefaultCertificate();
   RequestId requestId = {{101}};
@@ -95,7 +98,7 @@
 
 BOOST_AUTO_TEST_CASE(OnChallengeRequestWithCode)
 {
-  auto identity = addIdentity(Name("/ndn/site1"));
+  auto identity = m_keyChain.createIdentity(Name("/ndn/site1"));
   auto key = identity.getDefaultKey();
   auto cert = key.getDefaultCertificate();
   JsonSection secret;
@@ -124,7 +127,7 @@
 
 BOOST_AUTO_TEST_CASE(OnValidateInterestComingWithWrongCode)
 {
-  auto identity = addIdentity(Name("/ndn/site1"));
+  auto identity = m_keyChain.createIdentity(Name("/ndn/site1"));
   auto key = identity.getDefaultKey();
   auto cert = key.getDefaultCertificate();
   JsonSection secret;