Unit tests for DefaultPortStatistics class

Change-Id: I778bc0a10381a304d35aaf2628c254d8f1c1e5db

+/*
+ * 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.net.device;
+
+import org.junit.Test;
+import org.onosproject.net.NetTestTools;
+
+import com.google.common.testing.EqualsTester;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
+
+/**
+ * DefaultPortStatistics unit tests.
+ */
+public class DefaultPortStatisticsTest {
+
+    private final PortStatistics stats1 = DefaultPortStatistics.builder()
+            .setBytesReceived(1)
+            .setBytesSent(2)
+            .setDurationNano(3)
+            .setDurationSec(4)
+            .setPacketsReceived(5)
+            .setPacketsSent(6)
+            .setPacketsRxDropped(7)
+            .setPacketsRxErrors(8)
+            .setPacketsTxDropped(9)
+            .setPacketsTxErrors(10)
+            .setPort(80)
+            .setDeviceId(NetTestTools.did("1"))
+            .build();
+
+    private final PortStatistics stats2 = DefaultPortStatistics.builder()
+            .setBytesReceived(1)
+            .setBytesSent(2)
+            .setDurationNano(3)
+            .setDurationSec(4)
+            .setPacketsReceived(5)
+            .setPacketsSent(6)
+            .setPacketsRxDropped(7)
+            .setPacketsRxErrors(8)
+            .setPacketsTxDropped(9)
+            .setPacketsTxErrors(11)
+            .setPort(80)
+            .setDeviceId(NetTestTools.did("1"))
+            .build();
+
+    /**
+     * Checks that the GroupOperation class is immutable.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(DefaultPortStatistics.class);
+    }
+
+    @Test
+    public void testConstruction() {
+        assertThat(stats1.bytesReceived(), is(1L));
+        assertThat(stats1.bytesSent(), is(2L));
+        assertThat(stats1.durationNano(), is(3L));
+        assertThat(stats1.durationSec(), is(4L));
+        assertThat(stats1.packetsReceived(), is(5L));
+        assertThat(stats1.packetsSent(), is(6L));
+        assertThat(stats1.packetsRxDropped(), is(7L));
+        assertThat(stats1.packetsRxErrors(), is(8L));
+        assertThat(stats1.packetsTxDropped(), is(9L));
+        assertThat(stats1.packetsTxErrors(), is(10L));
+        assertThat(stats1.port(), is(80));
+    }
+
+    /**
+     * Tests the equals, hashCode and toString methods using Guava EqualsTester.
+     */
+    @Test
+    public void testEquals() {
+        new EqualsTester()
+                .addEqualityGroup(stats1, stats1)
+                .addEqualityGroup(stats2)
+                .testEquals();
+    }
+}