Moving DHCP to onos branch. REST API included, GUI to be added later.

Change-Id: Id52781ba93d48ad1d56097a9ceff7613a190c48e
diff --git a/apps/onos-app-dhcp/src/test/java/org/onosproject/dhcp/IPAssignmentTest.java b/apps/onos-app-dhcp/src/test/java/org/onosproject/dhcp/IPAssignmentTest.java
new file mode 100644
index 0000000..0783ec7
--- /dev/null
+++ b/apps/onos-app-dhcp/src/test/java/org/onosproject/dhcp/IPAssignmentTest.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2014 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.dhcp;
+
+import com.google.common.testing.EqualsTester;
+import junit.framework.TestCase;
+import org.junit.Assert;
+import org.junit.Test;
+import org.onlab.packet.Ip4Address;
+
+import java.util.Date;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.fail;
+
+/**
+ * Unit Tests for IPAssignment class.
+ */
+public class IPAssignmentTest extends TestCase {
+
+    private final Date dateNow = new Date();
+
+    private final IPAssignment stats1 = IPAssignment.builder()
+            .ipAddress(Ip4Address.valueOf("10.10.10.10"))
+            .leasePeriod(300)
+            .assignmentStatus(IPAssignment.AssignmentStatus.Option_Expired)
+            .timestamp(dateNow)
+            .build();
+
+    private final IPAssignment stats2 = IPAssignment.builder()
+            .ipAddress(Ip4Address.valueOf("10.10.10.10"))
+            .leasePeriod(300)
+            .assignmentStatus(IPAssignment.AssignmentStatus.Option_Assigned)
+            .timestamp(dateNow)
+            .build();
+
+    private final IPAssignment stats3 = IPAssignment.builder(stats1)
+            .build();
+
+    /**
+     *  Tests the constructor for the class.
+     */
+    @Test
+    public void testConstruction() {
+        assertThat(stats3.ipAddress(), is(Ip4Address.valueOf("10.10.10.10")));
+        assertThat(stats3.timestamp(), is(dateNow));
+        assertThat(stats3.leasePeriod(), is(300));
+        assertThat(stats3.assignmentStatus(), is(IPAssignment.AssignmentStatus.Option_Expired));
+    }
+
+    /**
+     * Tests the equality and inequality of objects using Guava EqualsTester.
+     */
+    @Test
+    public void testEquals() {
+        new EqualsTester()
+                .addEqualityGroup(stats1, stats1)
+                .addEqualityGroup(stats2)
+                .testEquals();
+    }
+
+    /**
+     * Tests if the toString method returns a consistent value for hashing.
+     */
+    @Test
+    public void testToString() {
+        assertThat(stats1.toString(), is(stats1.toString()));
+    }
+
+    /**
+     * Tests if the validateInputs method returns an exception for malformed object.
+     */
+    @Test
+    public void testValidateInputs() {
+        try {
+            IPAssignment stats4 = IPAssignment.builder()
+                    .ipAddress(Ip4Address.valueOf("10.10.10.10"))
+                    .leasePeriod(300)
+                    .build();
+
+            fail("Construction of a malformed IPAssignment did not throw an exception");
+        } catch (NullPointerException e) {
+            Assert.assertThat(e.getMessage(), containsString("must be specified"));
+        }
+    }
+}
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