diff --git a/test_utils.h b/test_utils.h
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+// Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UPDATE_ENGINE_TEST_UTILS_H__
+#define UPDATE_ENGINE_TEST_UTILS_H__
+
+#include <vector>
+#include <string>
+
+// These are some handy functions for unittests.
+
+namespace chromeos_update_engine {
+
+// Returns the entire contents of the file at path. If the file doesn't
+// exist or error occurrs, an empty vector is returned.
+std::vector<char> ReadFile(const std::string& path);
+
+// Writes the data passed to path. The file at path will be overwritten if it
+// exists. Returns true on success, false otherwise.
+bool WriteFile(const std::string& path, const std::vector<char>& data);
+
+// Returns the size of the file at path. If the file doesn't exist or some
+// error occurrs, -1 is returned.
+off_t FileSize(const std::string& path);
+
+// Gzip compresses the data passed using the gzip command line program.
+// Returns compressed data back.
+std::vector<char> GzipCompressData(const std::vector<char>& data);
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_TEST_UTILS_H__
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