[ONOS-2611] Unit test for BGP Keepalive message

Change-Id: Iba875902258aaf4722d24c334f73ac9dfbb33948

+/*
+ * Copyright 2014-2015 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.bgp;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.instanceOf;
+import static org.hamcrest.core.Is.is;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.junit.Test;
+import org.onosproject.bgpio.exceptions.BGPParseException;
+import org.onosproject.bgpio.protocol.BGPFactories;
+import org.onosproject.bgpio.protocol.BGPKeepaliveMsg;
+import org.onosproject.bgpio.protocol.BGPMessage;
+import org.onosproject.bgpio.protocol.BGPMessageReader;
+import org.onosproject.bgpio.types.BGPHeader;
+
+/**
+ * Test case for BGP KEEPALIVE Message.
+ */
+public class BGPKeepaliveMsgTest {
+
+    /**
+     * This test case checks BGP Keepalive message.
+     */
+    @Test
+    public void keepaliveMessageTest1() throws BGPParseException {
+
+        // BGP KEEPALIVE Message
+        byte[] keepaliveMsg = new byte[] {(byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
+                                          (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
+                                          (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
+                                          (byte) 0xff, (byte) 0xff, (byte) 0xff, (byte) 0xff,
+                                          0x00, 0x13, 0x04};
+
+        byte[] testKeepaliveMsg;
+        ChannelBuffer buffer = ChannelBuffers.dynamicBuffer();
+        buffer.writeBytes(keepaliveMsg);
+
+        BGPMessageReader<BGPMessage> reader = BGPFactories.getGenericReader();
+        BGPMessage message;
+        BGPHeader bgpHeader = new BGPHeader();
+
+        message = reader.readFrom(buffer, bgpHeader);
+
+        assertThat(message, instanceOf(BGPKeepaliveMsg.class));
+        ChannelBuffer buf = ChannelBuffers.dynamicBuffer();
+        message.writeTo(buf);
+
+        int readLen = buf.writerIndex();
+        testKeepaliveMsg = new byte[readLen];
+        buf.readBytes(testKeepaliveMsg, 0, readLen);
+
+        assertThat(testKeepaliveMsg, is(keepaliveMsg));
+    }
+}