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diff --git a/src/lib/testutils/io_utils.h b/src/lib/testutils/io_utils.h
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+// Copyright (C) 2015-2017 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 TEST_IO_UTILS_H
+#define TEST_IO_UTILS_H
+
+#include <string>
+#include <sys/stat.h>
+
+namespace isc {
+namespace test {
+
+/// @brief Checks if specified file exists.
+///
+/// @param file_path Path to a file.
+/// @return true if the file exists, false otherwise.
+bool fileExists(const std::string& file_path);
+
+/// @brief Reads contents of the specified file.
+///
+/// @param file_path Path to a file.
+/// @return File contents.
+std::string readFile(const std::string& file_path);
+
+/// @brief Removes comments from a JSON file
+///
+/// Removes //, # and /* */ comments from the input file and writes its content
+/// to another file. The comments are replaced with spaces, so the original
+/// token locations should remain unaffected. This is rather naive
+/// implementation, but it's probably sufficient for testing. It won't be able
+/// to pick any trickier cases, like # or // appearing in strings, nested C++
+/// comments etc at the exception of // in URLs.
+///
+/// @param input_file file to be stripped of comments
+/// @return filename of a new file that has comments stripped from it
+/// @throw BadValue if the input file cannot be opened
+std::string decommentJSONfile(const std::string& input_file);
+
+}; // end of isc::test namespace
+}; // end of isc namespace
+
+#endif // TEST_IO_UTILS_H