Add license headers in tests/unit

tests/unit/script/textinput.rs

@@ -1,3 +1,12 @@
+// Copyright 2013 The Servo Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
 use script::textinput::{TextInput, Selection, Lines, DeleteDir};
 use std::borrow::ToOwned;