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diff --git a/src/lib/util/unittests/wiredata.h b/src/lib/util/unittests/wiredata.h
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+++ b/src/lib/util/unittests/wiredata.h
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+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef UTIL_UNITTESTS_WIREDATA_H
+#define UTIL_UNITTESTS_WIREDATA_H 1
+
+#include <cstddef>
+
+/// \file wiredata.h
+/// \brief Utilities for tests with wire data.
+///
+/// This utility provides convenient helper functions for unit tests using
+/// wire (binary) data.
+
+namespace isc {
+namespace util {
+namespace unittests {
+
+/// \brief Compare two sets of binary data in a google test.
+///
+/// This method checks if the expected and actual data have the same length
+/// and all bytes are the same.  If not, it reports the point of mismatch in
+/// the google test format.
+void matchWireData(const void* expected_data, std::size_t expected_len,
+                   const void* actual_data, std::size_t actual_len);
+}
+}
+}
+
+#endif // UTIL_UNITTESTS_WIREDATA_H
+
+// Local Variables:
+// mode: c++
+// End: