add license header to 4 files

Author: Daisy Guo

tests/src/dat/empty.js

@@ -0,0 +1,2 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more contributor
+// license agreements; and to You under the Apache License, Version 2.0.

tests/src/dat/hello.js

@@ -1,3 +1,6 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more contributor
+// license agreements; and to You under the Apache License, Version 2.0.
+
 /**
  * Hello, world.
  */

tests/src/dat/malformed.js

@@ -1 +1,4 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more contributor
+// license agreements; and to You under the Apache License, Version 2.0.
+
 x

tools/travis/test_openwhisk.sh

@@ -1,5 +1,23 @@
 #!/usr/bin/env bash
 
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
 set -e
 
 #