diff --git a/tests/clock-fixture.cpp b/tests/clock-fixture.cpp
new file mode 100644
index 0000000..b3b4ac7
--- /dev/null
+++ b/tests/clock-fixture.cpp
@@ -0,0 +1,60 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2022,  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 NLSR (Named-data Link State Routing).
+ * See AUTHORS.md for complete list of NLSR authors and contributors.
+ *
+ * NLSR 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.
+ *
+ * NLSR 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
+ * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "tests/clock-fixture.hpp"
+
+namespace nlsr {
+namespace test {
+
+ClockFixture::ClockFixture()
+  : m_steadyClock(std::make_shared<time::UnitTestSteadyClock>())
+  , m_systemClock(std::make_shared<time::UnitTestSystemClock>())
+{
+  time::setCustomClocks(m_steadyClock, m_systemClock);
+}
+
+ClockFixture::~ClockFixture()
+{
+  time::setCustomClocks(nullptr, nullptr);
+}
+
+void
+ClockFixture::advanceClocks(time::nanoseconds tick, time::nanoseconds total)
+{
+  BOOST_ASSERT(tick > time::nanoseconds::zero());
+  BOOST_ASSERT(total >= time::nanoseconds::zero());
+
+  while (total > time::nanoseconds::zero()) {
+    auto t = std::min(tick, total);
+    m_steadyClock->advance(t);
+    m_systemClock->advance(t);
+    total -= t;
+
+    afterTick();
+  }
+}
+
+} // namespace test
+} // namespace nlsr