update header files in tests

Change-Id: Ibfffb9367349f58eeb193350bad34fdfccd8c553
diff --git a/tests/test-common.hpp b/tests/test-common.hpp
new file mode 100644
index 0000000..7039e83
--- /dev/null
+++ b/tests/test-common.hpp
@@ -0,0 +1,40 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2019 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.
+ */
+
+#ifndef NDNCERT_TESTS_COMMON_HPP
+#define NDNCERT_TESTS_COMMON_HPP
+
+#include <iostream>
+#include <ndn-cxx/metadata-object.hpp>
+#include <ndn-cxx/security/signing-helpers.hpp>
+#include <ndn-cxx/security/transform/base64-encode.hpp>
+#include <ndn-cxx/security/transform/buffer-source.hpp>
+#include <ndn-cxx/security/transform/public-key.hpp>
+#include <ndn-cxx/security/transform/stream-sink.hpp>
+#include <ndn-cxx/security/verification-helpers.hpp>
+#include <ndn-cxx/util/dummy-client-face.hpp>
+
+#include "boost-test.hpp"
+#include "database-fixture.hpp"
+#include "identity-management-fixture.hpp"
+#include "unit-test-time-fixture.hpp"
+
+#endif  // NDNCERT_TESTS_COMMON_HPP