tests: IdentityManagementFixture no longer derives from BaseFixture

Also rename it to KeyChainFixture

Refs: #4528
Change-Id: Id86f4affc9c4c9ae159912430cc3e78557bf1ac2
diff --git a/tests/key-chain-fixture.hpp b/tests/key-chain-fixture.hpp
new file mode 100644
index 0000000..810dab8
--- /dev/null
+++ b/tests/key-chain-fixture.hpp
@@ -0,0 +1,82 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2019,  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 is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD 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.
+ *
+ * NFD 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 a copy of the GNU General Public License along with
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NFD_TESTS_KEY_CHAIN_FIXTURE_HPP
+#define NFD_TESTS_KEY_CHAIN_FIXTURE_HPP
+
+#include "tests/test-common.hpp"
+
+#include <ndn-cxx/security/key-chain.hpp>
+
+namespace nfd {
+namespace tests {
+
+/** \brief A fixture providing an in-memory KeyChain.
+ */
+class KeyChainFixture
+{
+public:
+  /** \brief add identity
+   *  \return whether successful
+   */
+  bool
+  addIdentity(const Name& identity,
+              const ndn::KeyParams& params = ndn::KeyChain::getDefaultKeyParams());
+
+  /** \brief save identity certificate to a file
+   *  \param identity identity name
+   *  \param filename file name, must be writable
+   *  \param allowAdd if true, add new identity when necessary
+   *  \return whether successful
+   */
+  bool
+  saveIdentityCertificate(const Name& identity, const std::string& filename, bool allowAdd = false);
+
+  /** \brief retrieve identity certificate as base64 string
+   *  \param identity identity name
+   *  \param allowAdd if true, add new identity when necessary
+   *  \throw std::runtime_error identity does not exist and \p allowAdd is false
+   */
+  std::string
+  getIdentityCertificateBase64(const Name& identity, bool allowAdd = false);
+
+protected:
+  KeyChainFixture();
+
+  /** \brief deletes saved certificate files
+   */
+  ~KeyChainFixture();
+
+protected:
+  ndn::KeyChain m_keyChain;
+
+private:
+  std::vector<std::string> m_certFiles;
+};
+
+} // namespace tests
+} // namespace nfd
+
+#endif // NFD_TESTS_KEY_CHAIN_FIXTURE_HPP