@Test
public void testFromJsonObject() {

	JsonObject jsonObject = Json
			.createObjectBuilder()
			.add(TwistWithCovarianceStamped.FIELD_HEADER,
					t1.getHeader().toJsonObject())
			.add(TwistWithCovarianceStamped.FIELD_TWIST,
					t1.getTwist().toJsonObject()).build();
	TwistWithCovarianceStamped p = TwistWithCovarianceStamped
			.fromJsonObject(jsonObject);
	assertEquals(t1.toString(), p.toString());
	assertEquals(t1.toJsonObject(), p.toJsonObject());
	assertEquals(t1.getMessageType(), p.getMessageType());
	assertEquals(t1.getHeader(), p.getHeader());
	assertEquals(t1.getTwist(), p.getTwist());
	assertNotSame(t1, p);
	assertNotSame(t1.toString(), p.toString());
	assertNotSame(t1.toJsonObject(), p.toJsonObject());
}