[ONOS-3246] Add the junit test code of DefaultHostRoute

Change-Id: I7b08664f453e75a3a470e87ca84bcbede0e4bd73

+/*
+ * 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.subnet;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
+
+import org.junit.Test;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.IpPrefix;
+import org.onosproject.vtnrsc.DefaultHostRoute;
+import org.onosproject.vtnrsc.HostRoute;
+
+import com.google.common.testing.EqualsTester;
+
+/**
+ * Unit tests for DefaultHostRoute class.
+ */
+public class DefaultHostRouteTest {
+    final IpAddress nexthop1 = IpAddress.valueOf("192.168.1.1");
+    final IpAddress nexthop2 = IpAddress.valueOf("192.168.1.2");
+    final IpPrefix destination1 = IpPrefix.valueOf("1.1.1.1/1");
+    final IpPrefix destination2 = IpPrefix.valueOf("1.1.1.1/2");
+
+    /**
+     * Checks that the DefaultHostRoute class is immutable.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(DefaultHostRoute.class);
+    }
+
+    /**
+     * Checks the operation of equals() methods.
+     */
+    @Test
+    public void testEquals() {
+        HostRoute route1 = new DefaultHostRoute(nexthop1, destination1);
+        HostRoute route2 = new DefaultHostRoute(nexthop1, destination1);
+        HostRoute route3 = new DefaultHostRoute(nexthop2, destination2);
+        new EqualsTester().addEqualityGroup(route1, route2)
+                .addEqualityGroup(route3).testEquals();
+    }
+
+    /**
+     * Checks the construction of a DefaultHostRoute object.
+     */
+    @Test
+    public void testConstruction() {
+        final HostRoute host = new DefaultHostRoute(nexthop1, destination1);
+        assertThat(nexthop1, is(host.nexthop()));
+        assertThat(destination1, is(host.destination()));
+    }
+}