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diff --git a/src/lib/util/unittests/testdata.h b/src/lib/util/unittests/testdata.h
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+// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#ifndef __UTIL_UNITTESTS_TESTDATA_H
+#define __UTIL_UNITTESTS_TESTDATA_H 1
+
+/**
+ * @file testdata.h
+ * @short Manipulating test data files.
+ *
+ * This utility defines functions that help test case handle test data
+ * stored in a file.
+ */
+
+namespace isc {
+namespace util {
+namespace unittests {
+/// Add a path (directory) that \c openTestData() will search for test data
+/// files.
+void addTestDataPath(const std::string& path);
+
+/// Open a file specified by 'datafile' using the data paths registered via
+/// addTestDataPath().  On success, ifs will be ready for reading the data
+/// stored in 'datafile'.  If the data file cannot be open with any of the
+/// registered paths, a runtime_error exception will be thrown.
+void openTestData(const char* const datafile, std::ifstream& ifs);
+}
+}
+}
+
+#endif // __UTIL_UNITTESTS_TESTDATA_H
+
+// Local Variables:
+// mode: c++
+// End: