diff --git a/tests/unit/security/pib/key.t.cpp b/tests/unit/security/pib/key.t.cpp
new file mode 100644
index 0000000..3c5d207
--- /dev/null
+++ b/tests/unit/security/pib/key.t.cpp
@@ -0,0 +1,122 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2018 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "security/pib/key.hpp"
+#include "security/pib/pib.hpp"
+#include "security/pib/pib-memory.hpp"
+#include "security/pib/detail/key-impl.hpp"
+
+#include "boost-test.hpp"
+#include "pib-data-fixture.hpp"
+
+namespace ndn {
+namespace security {
+namespace pib {
+namespace tests {
+
+using namespace ndn::security::tests;
+
+BOOST_AUTO_TEST_SUITE(Security)
+BOOST_AUTO_TEST_SUITE(Pib)
+BOOST_FIXTURE_TEST_SUITE(TestKey, PibDataFixture)
+
+using pib::Pib;
+
+BOOST_AUTO_TEST_CASE(ValidityChecking)
+{
+  using security::pib::detail::KeyImpl;
+
+  Key key;
+
+  BOOST_CHECK_EQUAL(static_cast<bool>(key), false);
+  BOOST_CHECK_EQUAL(!key, true);
+
+  if (key)
+    BOOST_CHECK(false);
+  else
+    BOOST_CHECK(true);
+
+  auto keyImpl = make_shared<KeyImpl>(id1Key1Name, id1Key1.data(), id1Key1.size(),
+                                      make_shared<pib::PibMemory>());
+  key = Key(keyImpl);
+
+  BOOST_CHECK_EQUAL(static_cast<bool>(key), true);
+  BOOST_CHECK_EQUAL(!key, false);
+
+  if (key)
+    BOOST_CHECK(true);
+  else
+    BOOST_CHECK(false);
+}
+
+/**
+ * pib::Key is a wrapper of pib::detail::KeyImpl.  Since the functionalities of KeyImpl
+ * have already been tested in detail/key-impl.t.cpp, we only test the shared property
+ * of pib::Key in this test case.
+ */
+
+BOOST_AUTO_TEST_CASE(Share)
+{
+  using security::pib::detail::KeyImpl;
+
+  auto keyImpl = make_shared<KeyImpl>(id1Key1Name, id1Key1.data(), 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()));
+  key2.removeCertificate(id1Key1Cert1.getName());
+  BOOST_CHECK_THROW(key1.getCertificate(id1Key1Cert1.getName()), Pib::Error);
+
+  key1.setDefaultCertificate(id1Key1Cert1);
+  BOOST_CHECK_NO_THROW(key2.getDefaultCertificate());
+}
+
+BOOST_AUTO_TEST_CASE(Helpers)
+{
+  BOOST_CHECK_EQUAL(v2::constructKeyName("/hello", name::Component("world")), "/hello/KEY/world");
+
+  BOOST_CHECK_EQUAL(v2::isValidKeyName("/hello"), false);
+  BOOST_CHECK_EQUAL(v2::isValidKeyName("/hello/KEY"), false);
+  BOOST_CHECK_EQUAL(v2::isValidKeyName("/hello/KEY/world"), true);
+
+  BOOST_CHECK_EQUAL(v2::isValidKeyName("/KEY/hello"), true);
+  BOOST_CHECK_EQUAL(v2::isValidKeyName("/hello/world/KEY/!"), true);
+
+  BOOST_CHECK_EQUAL(v2::extractIdentityFromKeyName("/KEY/hello"), "/");
+  BOOST_CHECK_EQUAL(v2::extractIdentityFromKeyName("/hello/KEY/world"), "/hello");
+  BOOST_CHECK_EQUAL(v2::extractIdentityFromKeyName("/hello/world/KEY/!"), "/hello/world");
+
+  BOOST_CHECK_THROW(v2::extractIdentityFromKeyName("/hello"), std::invalid_argument);
+}
+
+BOOST_AUTO_TEST_SUITE_END() // TestKey
+BOOST_AUTO_TEST_SUITE_END() // Pib
+BOOST_AUTO_TEST_SUITE_END() // Security
+
+} // namespace tests
+} // namespace pib
+} // namespace security
+} // namespace ndn