test/java/time/tck/java/time/AbstractTCKTest.java

*** 55,64 ****
--- 55,65 ----
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package tck.java.time;
  
  import static org.testng.Assert.assertEquals;
+ import static org.testng.Assert.assertSame;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.DataInputStream;
  import java.io.IOException;
*** 87,96 ****
--- 88,103 ----
          assertEquals(object instanceof Serializable, true);
          Object deserializedObject = writeThenRead(object);
          assertEquals(deserializedObject, object);
      }
  
+     protected static void assertSerializableSame(Object object) throws IOException, ClassNotFoundException {
+         assertEquals(object instanceof Serializable, true);
+         Object deserializedObject = writeThenRead(object);
+         assertSame(deserializedObject, object);
+     }
+ 
      private static Object writeThenRead(Object object) throws IOException, ClassNotFoundException {
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          try (ObjectOutputStream oos = new ObjectOutputStream(baos) ) {
              oos.writeObject(object);
          }