diff --git a/tests/unit-tests/security/pib/key.t.cpp b/tests/unit-tests/security/pib/key.t.cpp
index 2275c2e..a3543a3 100644
--- a/tests/unit-tests/security/pib/key.t.cpp
+++ b/tests/unit-tests/security/pib/key.t.cpp
@@ -79,6 +79,9 @@
   auto keyImpl = make_shared<KeyImpl>(id1Key1Name, id1Key1.buf(), id1Key1.size(), make_shared<pib::PibMemory>());
   Key key1(keyImpl);
   Key key2(keyImpl);
+  BOOST_CHECK_EQUAL(key1, key2);
+  BOOST_CHECK_NE(key1, Key());
+  BOOST_CHECK_EQUAL(Key(), Key());
 
   key1.addCertificate(id1Key1Cert1);
   BOOST_CHECK_NO_THROW(key2.getCertificate(id1Key1Cert1.getName()));