[ONOS-3245] Add the junit test code of DefaultAllocationPool

Change-Id: Ifa4fd9b97ef16fc842e621db40029040a2ac0df7

+/*
+ * 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.onosproject.vtnrsc.AllocationPool;
+import org.onosproject.vtnrsc.DefaultAllocationPool;
+
+import com.google.common.testing.EqualsTester;
+
+/**
+ * Unit tests for DefaultAllocationPool class.
+ */
+public class DefaultAllocationPoolTest {
+
+    final IpAddress startIP1 = IpAddress.valueOf("192.168.1.1");
+    final IpAddress startIP2 = IpAddress.valueOf("192.168.1.2");
+    final IpAddress endIP1 = IpAddress.valueOf("192.168.1.1");
+    final IpAddress endIP2 = IpAddress.valueOf("192.168.1.2");
+
+    /**
+     * Checks that the DefaultAllocationPool class is immutable.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(DefaultAllocationPool.class);
+    }
+
+    /**
+     * Checks the operation of equals() methods.
+     */
+    @Test
+    public void testEquals() {
+        AllocationPool pool1 = new DefaultAllocationPool(startIP1, endIP1);
+        AllocationPool pool2 = new DefaultAllocationPool(startIP1, endIP1);
+        AllocationPool pool3 = new DefaultAllocationPool(startIP2, endIP2);
+        new EqualsTester().addEqualityGroup(pool1, pool2)
+                .addEqualityGroup(pool3).testEquals();
+    }
+
+    /**
+     * Checks the construction of a DefaultAllocationPool object.
+     */
+    @Test
+    public void testConstruction() {
+        final AllocationPool apool = new DefaultAllocationPool(startIP1, endIP1);
+        assertThat(startIP1, is(apool.startIp()));
+        assertThat(endIP1, is(apool.endIp()));
+    }
+}