checkstyle rule to check copyrights

Change-Id: Ia9bab40b5fe64fca539058a4316371f7acc0f387
diff --git a/protocols/isis/ctl/src/test/java/org/onosproject/isis/controller/impl/IsisMessageDecoderTest.java b/protocols/isis/ctl/src/test/java/org/onosproject/isis/controller/impl/IsisMessageDecoderTest.java
index 4948ec6..a2fb8ce 100644
--- a/protocols/isis/ctl/src/test/java/org/onosproject/isis/controller/impl/IsisMessageDecoderTest.java
+++ b/protocols/isis/ctl/src/test/java/org/onosproject/isis/controller/impl/IsisMessageDecoderTest.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed 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.
+ */
 package org.onosproject.isis.controller.impl;
 
 import com.google.common.primitives.Bytes;
@@ -57,4 +72,4 @@
         channelBuffer = ChannelBuffers.copiedBuffer(Bytes.concat(hello, array));
         assertThat(isisMessageDecoder.decode(ctx, channel, channelBuffer), is(nullValue()));
     }
-}
\ No newline at end of file
+}