diff --git a/tests/test-certificate-cache.cpp b/tests/test-certificate-cache.cpp
new file mode 100644
index 0000000..29a45fc
--- /dev/null
+++ b/tests/test-certificate-cache.cpp
@@ -0,0 +1,57 @@
+/**
+ * Copyright (C) 2013 Regents of the University of California.
+ * @author: Yingdi Yu <yingdi0@cs.ucla.edu>
+ * See COPYING for copyright and distribution information.
+ */
+
+#include <boost/test/unit_test.hpp>
+#include <unistd.h>
+#include "security/certificate-cache-ttl.hpp"
+#include "face.hpp"
+
+using namespace std;
+using namespace ndn;
+
+
+BOOST_AUTO_TEST_SUITE(TestCertificateCache)
+
+void
+getCertificateTtl(shared_ptr<CertificateCacheTtl> cache, const Name &name, bool cached)
+{
+  BOOST_CHECK_EQUAL(static_cast<bool>(cache->getCertificate(name)), cached);
+}
+
+
+BOOST_AUTO_TEST_CASE (Ttl)
+{
+  shared_ptr<boost::asio::io_service> io = make_shared<boost::asio::io_service>();
+  shared_ptr<CertificateCacheTtl> cache = make_shared<CertificateCacheTtl>(io, 1);
+  Scheduler scheduler(*io);
+
+  shared_ptr<IdentityCertificate> cert1 = make_shared<IdentityCertificate>();
+  Name certName1("/tmp/KEY/ksk-1/ID-CERT/1");
+  cert1->setName(certName1);
+  cert1->setFreshnessPeriod(500);
+  shared_ptr<IdentityCertificate> cert2 = make_shared<IdentityCertificate>();
+  Name certName2("/tmp/KEY/ksk-2/ID-CERT/2");
+  cert2->setName(certName2);
+  cert2->setFreshnessPeriod(1000);
+
+  Name name1 = certName1.getPrefix(-1);
+  Name name2 = certName2.getPrefix(-1);
+  
+  cache->insertCertificate(cert1);
+  cache->insertCertificate(cert2);
+
+  scheduler.scheduleEvent(time::seconds(0.3), bind(&getCertificateTtl, cache, name1, true));
+  scheduler.scheduleEvent(time::seconds(0.3), bind(&getCertificateTtl, cache, name2, true));
+  scheduler.scheduleEvent(time::seconds(0.6), bind(&getCertificateTtl, cache, name1, false));
+  scheduler.scheduleEvent(time::seconds(0.6), bind(&getCertificateTtl, cache, name2, true));
+  scheduler.scheduleEvent(time::seconds(0.6), bind(&CertificateCache::insertCertificate, &*cache, cert2));
+  scheduler.scheduleEvent(time::seconds(1.3), bind(&getCertificateTtl, cache, name2, true));
+  scheduler.scheduleEvent(time::seconds(1.7), bind(&getCertificateTtl, cache, name2, false));
+
+  io->run();
+}
+
+BOOST_AUTO_TEST_SUITE_END()