[ONOS-3231] Add the junit test code of PhysicalNetwork

Change-Id: I14a88859593739cbe7cb7ed480cdcad63437d915

+/*
+ * 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.PhysicalNetwork;
+
+import com.google.common.testing.EqualsTester;
+
+/**
+ * Unit tests for PhysicalNetwork class.
+ */
+public class PhysicalNetworkTest {
+
+    final PhysicalNetwork physicalNetwork1 = PhysicalNetwork.physicalNetwork("1");
+    final PhysicalNetwork sameAsPhysicalNetwork1 = PhysicalNetwork.physicalNetwork("1");
+    final PhysicalNetwork physicalNetwork2 = PhysicalNetwork.physicalNetwork("2");
+
+    /**
+     * Checks that the PhysicalNetwork class is immutable.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(PhysicalNetwork.class);
+    }
+
+    /**
+     * Checks the operation of equals() methods.
+     */
+    @Test
+    public void testEquals() {
+        new EqualsTester().addEqualityGroup(physicalNetwork1, sameAsPhysicalNetwork1)
+                .addEqualityGroup(physicalNetwork2).testEquals();
+    }
+
+    /**
+     * Checks the construction of a PhysicalNetwork object.
+     */
+    @Test
+    public void testConstruction() {
+        final String physicalNetworkValue = "s";
+        final PhysicalNetwork physicalNetwork = PhysicalNetwork
+                .physicalNetwork(physicalNetworkValue);
+        assertThat(physicalNetwork, is(notNullValue()));
+        assertThat(physicalNetwork.physicalNetwork(), is(physicalNetworkValue));
+    }
+}