**breaking** Add KeyChain parameter to the producer API
Applications must be able to specify the KeyChain instance to use
Change-Id: If5054dbb8c00e2d18af8bf6a9199ded7266688f3
diff --git a/tests/key-chain-fixture.hpp b/tests/key-chain-fixture.hpp
new file mode 100644
index 0000000..bdd705a
--- /dev/null
+++ b/tests/key-chain-fixture.hpp
@@ -0,0 +1,37 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2022 Regents of the University of California.
+ *
+ * This file is part of PSync.
+ *
+ * PSync 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.
+ *
+ * PSync 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 a copy of the GNU Lesser General Public License along with
+ * PSync, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef PSYNC_TESTS_KEY_CHAIN_FIXTURE_HPP
+#define PSYNC_TESTS_KEY_CHAIN_FIXTURE_HPP
+
+#include <ndn-cxx/security/key-chain.hpp>
+
+namespace psync::tests {
+
+/**
+ * @brief A fixture providing an in-memory KeyChain.
+ */
+class KeyChainFixture
+{
+protected:
+ ndn::KeyChain m_keyChain{"pib-memory:", "tpm-memory:"};
+};
+
+} // namespace psync::tests
+
+#endif // PSYNC_TESTS_KEY_CHAIN_FIXTURE_HPP