question: private void checkRoundTrip ( Object o1 ) throws IOException , ClassNotFoundException { DataOutputStream out = getDataOutput ( ) ; DataSerializer . writeObject ( o1 , out ) ; out . flush ( ) ; DataInput in = getDataInput ( ) ; assertEquals ( o1 , DataSerializer . < Object > readObject ( in ) ) ; this . baos = new ByteArrayOutputStream ( ) ; }
target:  Data serializes and then data de-serializes the given object and asserts that the two objects satisfy o1.equals(o2)