[ONOS-2613] Unit test the BGP Update message

Change-Id: I54ece9cdfee2e7c6069b6a5a74b491e63aa861b9

+/*
+ * Copyright 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 java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Test;
+import org.onosproject.bgpio.types.As4Path;
+
+import com.google.common.testing.EqualsTester;
+
+/**
+ * Test for As4Path BGP Path Attribute.
+ */
+public class As4PathTest {
+    //Two scenarios as4path set and sequence
+    private final List<Integer> as4pathSet1 = new ArrayList<>();
+    private final List<Integer> as4pathSeq1 = new ArrayList<>();
+    private final List<Integer> as4pathSet2 = new ArrayList<>();
+    private final List<Integer> as4pathSeq2 = new ArrayList<>();
+    private final As4Path attr1 = new As4Path(as4pathSet1, null);
+    private final As4Path sameAsAttr1 = new As4Path(as4pathSet1, null);
+    private final As4Path attr2 = new As4Path(as4pathSet2, null);
+    private final As4Path attr3 = new As4Path(null, as4pathSeq1);
+    private final As4Path sameAsAttr3 = new As4Path(null, as4pathSeq1);
+    private final As4Path attr4 = new As4Path(null, as4pathSeq2);
+
+    @Test
+    public void basics() {
+        as4pathSet1.add(197358);
+        as4pathSet1.add(12883);
+        as4pathSet2.add(2008989);
+        as4pathSeq1.add(3009009);
+        as4pathSeq2.add(409900);
+        new EqualsTester()
+        .addEqualityGroup(attr1, sameAsAttr1)
+        .addEqualityGroup(attr2)
+        .addEqualityGroup(attr3, sameAsAttr3)
+        .addEqualityGroup(attr4)
+        .testEquals();
+    }
+}
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