[ONOS-3230] Add the junit test code of SegmentationId

Change-Id: I3452d782b4e4527f2f0fa23028f60b80a39aaffe

+/*
+ * 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.vtnrsc.tenantnetwork;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
+
+import org.junit.Test;
+import org.onosproject.vtnrsc.SegmentationId;
+
+import com.google.common.testing.EqualsTester;
+
+/**
+ * Unit tests for SegmentationId class.
+ */
+public class SegmentationIdTest {
+
+    final SegmentationId segmentationID1 = SegmentationId.segmentationId("1");
+    final SegmentationId sameAsSegmentationID1 = SegmentationId.segmentationId("1");
+    final SegmentationId segmentationID2 = SegmentationId.segmentationId("2");
+
+    /**
+     * Checks that the SegmentationId class is immutable.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(SegmentationId.class);
+    }
+
+    /**
+     * Checks the operation of equals() methods.
+     */
+    @Test
+    public void testEquals() {
+        new EqualsTester().addEqualityGroup(segmentationID1, sameAsSegmentationID1)
+                .addEqualityGroup(segmentationID2).testEquals();
+    }
+
+    /**
+     * Checks the construction of a segmentationId object.
+     */
+    @Test
+    public void testConstruction() {
+        final String segmentationIdValue = "s";
+        final SegmentationId segmentationId = SegmentationId.segmentationId(segmentationIdValue);
+        assertThat(segmentationId, is(notNullValue()));
+        assertThat(segmentationId.segmentationId(), is(segmentationIdValue));
+    }
+}