diff --git a/tests/unit/dummy-validator.hpp b/tests/unit/dummy-validator.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2018 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 NDN_TESTS_UNIT_DUMMY_VALIDATOR_HPP
+#define NDN_TESTS_UNIT_DUMMY_VALIDATOR_HPP
+
+#include "ndn-cxx/security/v2/validator.hpp"
+#include "ndn-cxx/security/v2/validation-policy.hpp"
+#include "ndn-cxx/security/v2/certificate-fetcher-offline.hpp"
+
+namespace ndn {
+namespace tests {
+
+/** \brief A validation policy for unit testing
+ */
+class DummyValidationPolicy : public security::v2::ValidationPolicy
+{
+public:
+  /** \brief constructor
+   *  \param shouldAccept whether to accept or reject all validation requests
+   */
+  explicit
+  DummyValidationPolicy(bool shouldAccept = true)
+  {
+    this->setResult(shouldAccept);
+  }
+
+  /** \brief change the validation result
+   *  \param shouldAccept whether to accept or reject all validation requests
+   */
+  void
+  setResult(bool shouldAccept)
+  {
+    m_decide = [shouldAccept] (const Name&) { return shouldAccept; };
+  }
+
+  /** \brief set a callback for validation
+   *  \param cb a callback which receives the Interest/Data name for each validation request;
+   *            its return value determines the validation result
+   */
+  void
+  setResultCallback(const function<bool(const Name&)>& cb)
+  {
+    m_decide = cb;
+  }
+
+protected:
+  void
+  checkPolicy(const Data& data, const shared_ptr<security::v2::ValidationState>& state,
+              const ValidationContinuation& continueValidation) override
+  {
+    if (m_decide(data.getName())) {
+      continueValidation(nullptr, state);
+    }
+    else {
+      state->fail(security::v2::ValidationError::NO_ERROR);
+    }
+  }
+
+  void
+  checkPolicy(const Interest& interest, const shared_ptr<security::v2::ValidationState>& state,
+              const ValidationContinuation& continueValidation) override
+  {
+    if (m_decide(interest.getName())) {
+      continueValidation(nullptr, state);
+    }
+    else {
+      state->fail(security::v2::ValidationError::NO_ERROR);
+    }
+  }
+
+private:
+  function<bool(const Name&)> m_decide;
+};
+
+class DummyValidator : public security::v2::Validator
+{
+public:
+  explicit
+  DummyValidator(bool shouldAccept = true)
+    : security::v2::Validator(make_unique<DummyValidationPolicy>(shouldAccept),
+                              make_unique<security::v2::CertificateFetcherOffline>())
+  {
+  }
+
+  DummyValidationPolicy&
+  getPolicy()
+  {
+    return static_cast<DummyValidationPolicy&>(security::v2::Validator::getPolicy());
+  }
+};
+
+} // namespace tests
+} // namespace ndn
+
+#endif // NDN_TESTS_UNIT_DUMMY_VALIDATOR_HPP