### Question:
TwistStamped extends Message { @Override public TwistStamped clone() { return new TwistStamped(this.header, this.twist); } TwistStamped();  TwistStamped(Header header, Twist twist); Header getHeader(); Twist getTwist(); @Override TwistStamped clone(); static TwistStamped fromJsonString(String jsonString); static TwistStamped fromMessage(Message m); static TwistStamped fromJsonObject(JsonObject jsonObject); static final String FIELD_HEADER; static final String FIELD_TWIST; static final String TYPE; }### Answer:
@Test public void testClone() { TwistStamped clone = t1.clone(); assertEquals(t1.toString(), clone.toString()); assertEquals(t1.toJsonObject(), clone.toJsonObject()); assertEquals(t1.getMessageType(), clone.getMessageType()); assertEquals(t1.getHeader(), clone.getHeader()); assertEquals(t1.getTwist(), clone.getTwist()); assertNotSame(t1, clone); assertNotSame(t1.toString(), clone.toString()); assertNotSame(t1.toJsonObject(), clone.toJsonObject()); }