diff --git a/mock_external_task.h b/mock_external_task.h
new file mode 100644
index 0000000..6469c83
--- /dev/null
+++ b/mock_external_task.h
@@ -0,0 +1,36 @@
+// Copyright (c) 2013 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 SHILL_MOCK_EXTERNAL_TASK_H_
+#define SHILL_MOCK_EXTERNAL_TASK_H_
+
+#include <gmock/gmock.h>
+
+#include "shill/external_task.h"
+
+namespace shill {
+
+class MockExternalTask : public ExternalTask {
+public:
+  MockExternalTask(ControlInterface *control,
+                   GLib *glib,
+                   const base::WeakPtr<RPCTaskDelegate> &task_delegate,
+                   const base::Callback<void(pid_t, int)> &death_callback);
+  virtual ~MockExternalTask();
+
+  MOCK_METHOD4(Start,
+               bool(const base::FilePath &file,
+                    const std::vector<std::string> &arguments,
+                    const std::map<std::string, std::string> &environment,
+                    Error *error));
+  MOCK_METHOD0(Stop, void());
+  MOCK_METHOD0(OnDelete, void());
+
+private:
+  DISALLOW_COPY_AND_ASSIGN(MockExternalTask);
+};
+
+}  // namespace shill
+
+#endif  // SHILL_MOCK_EXTERNAL_TASK_H_