Updating ca storage interface to support listing function

Change-Id: Iab9d50d075a139a671d94824b97c78b741203354
Refs:#4048
diff --git a/tests/database-fixture.hpp b/tests/database-fixture.hpp
new file mode 100644
index 0000000..fc9da55
--- /dev/null
+++ b/tests/database-fixture.hpp
@@ -0,0 +1,60 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2017, Regents of the University of California,
+ *                          Arizona Board of Regents,
+ *                          Colorado State University,
+ *                          University Pierre & Marie Curie, Sorbonne University,
+ *                          Washington University in St. Louis,
+ *                          Beijing Institute of Technology,
+ *                          The University of Memphis.
+ *
+ * This file, originally written as part of NFD (Named Data Networking Forwarding Daemon),
+ * is a part of ndncert, a certificate management system based on NDN.
+ *
+ * ndncert is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * ndncert 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 General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License along with
+ * ndncert, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndncert authors and contributors.
+ */
+
+#ifndef NDNCERT_TESTS_DATABASE_FIXTURE_HPP
+#define NDNCERT_TESTS_DATABASE_FIXTURE_HPP
+
+#include "test-common.hpp"
+#include "identity-management-fixture.hpp"
+#include <boost/filesystem.hpp>
+
+namespace ndn {
+namespace ndncert {
+namespace tests {
+
+class DatabaseFixture : public IdentityManagementV2TimeFixture
+{
+public:
+  DatabaseFixture()
+  {
+    dbDir = boost::filesystem::path(getenv("HOME")) / ".ndn";
+  }
+
+  ~DatabaseFixture()
+  {
+    boost::filesystem::remove_all(dbDir);
+  }
+
+public:
+  boost::filesystem::path dbDir;
+};
+
+} // namespace tests
+} // namespace ndncert
+} // namespace ndn
+
+#endif // NDNCERT_TESTS_DATABASE_FIXTURE_HPP