### Question:
TwistWithCovariance extends Message { @Override public TwistWithCovariance clone() { return new TwistWithCovariance(this.twist, this.covariance); } TwistWithCovariance();  TwistWithCovariance(Twist twist);  TwistWithCovariance(Twist twist, double[] covariance); Twist getTwist(); double[] getCovariance(); double[][] getCovarianceMatrix(); @Override TwistWithCovariance clone(); static TwistWithCovariance fromJsonString(String jsonString); static TwistWithCovariance fromMessage(Message m); static TwistWithCovariance fromJsonObject(JsonObject jsonObject); static final String FIELD_TWIST; static final String FIELD_COVARIANCE; static final String TYPE; static final int COVARIANCE_ROWS; static final int COVARIANCE_COLUMNS; static final int COVARIANCE_SIZE; }### Answer:
@Test public void testClone() { TwistWithCovariance clone = p2.clone(); assertEquals(p2.toString(), clone.toString()); assertEquals(p2.toJsonObject(), clone.toJsonObject()); assertEquals(p2.getMessageType(), clone.getMessageType()); assertEquals(p2.getTwist(), clone.getTwist()); assertTrue(Arrays.equals(p2.getCovariance(), clone.getCovariance())); assertTrue(Arrays.deepEquals(p2.getCovarianceMatrix(), clone.getCovarianceMatrix())); assertNotSame(p2, clone); assertNotSame(p2.toString(), clone.toString()); assertNotSame(p2.toJsonObject(), clone.toJsonObject()); assertNotSame(p2.getCovariance(), clone.getCovariance()); assertNotSame(p2.getCovarianceMatrix(), clone.getCovarianceMatrix()); }