Apply JUnit4 style test

Change-Id: I16a639dbf5f9dd7f08068cf94312e5d04cb8776a

@@ -16,7 +16,6 @@
 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;
@@ -31,7 +30,7 @@ import static org.junit.Assert.fail;
 /**
  * Unit Tests for IPAssignment class.
  */
-public class IpAssignmentTest extends TestCase {
+public class IpAssignmentTest {
 
     private final Date dateNow = new Date();
 

@@ -16,7 +16,6 @@
 package org.onosproject.store.service;
 
 import com.google.common.testing.EqualsTester;
-import junit.framework.TestCase;
 import org.junit.Test;
 
 import static org.hamcrest.MatcherAssert.assertThat;
@@ -26,7 +25,7 @@ import static org.hamcrest.Matchers.is;
  * Unit Tests for DatabseUpdate class.
  */
 
-public class DatabaseUpdateTest extends TestCase {
+public class DatabaseUpdateTest {
 
     private final DatabaseUpdate stats1 = DatabaseUpdate.newBuilder()
             .withCurrentValue("1".getBytes())

@@ -16,7 +16,6 @@
 package org.onosproject.store.service;
 
 import com.google.common.testing.EqualsTester;
-import junit.framework.TestCase;
 import org.junit.Test;
 
 import static org.hamcrest.MatcherAssert.assertThat;
@@ -25,7 +24,7 @@ import static org.hamcrest.Matchers.is;
 /**
  * MapEvent unit tests.
  */
-public class MapEventTest extends TestCase {
+public class MapEventTest {
 
     private final Versioned<Integer> vStats = new Versioned<>(2, 1);
 

@@ -16,7 +16,6 @@
 package org.onosproject.store.service;
 
 import com.google.common.testing.EqualsTester;
-import junit.framework.TestCase;
 
 import org.junit.Assert;
 import org.junit.Test;
@@ -31,7 +30,7 @@ import static org.hamcrest.Matchers.notNullValue;
 /**
  * MultiValuedTimestamp unit tests.
  */
-public class MultiValuedTimestampTest extends TestCase {
+public class MultiValuedTimestampTest {
 
     private final MultiValuedTimestamp<Integer, Integer> stats1 = new MultiValuedTimestamp<>(1, 3);
 

@@ -16,7 +16,6 @@
 package org.onosproject.store.service;
 
 import com.google.common.testing.EqualsTester;
-import junit.framework.TestCase;
 import org.junit.Test;
 
 import static org.hamcrest.MatcherAssert.assertThat;
@@ -25,7 +24,7 @@ import static org.hamcrest.Matchers.is;
 /**
  * Versioned unit tests.
  */
-public class VersionedTest extends TestCase {
+public class VersionedTest {
 
     private final Versioned<Integer> stats1 = new Versioned<>(1, 2, 3);
 

@@ -21,12 +21,14 @@ import com.esotericsoftware.minlog.Log;
 
 import junit.framework.TestCase;
 
+import static org.junit.Assert.fail;
+
 /**
  * Test of the Hexstring.
  *
  */
 
-public class HexStringTest extends TestCase {
+public class HexStringTest {
 
     @Test
     public void testMarshalling() throws Exception {