### Question:
Topic { public void publish(Message message) { if (!this.isAdvertised()) { this.advertise(); } String publishId = "publish:" + this.name + ":" + this.ros.nextId(); JsonObject call = Json.createObjectBuilder() .add(JRosbridge.FIELD_OP, JRosbridge.OP_CODE_PUBLISH) .add(JRosbridge.FIELD_ID, publishId) .add(JRosbridge.FIELD_TOPIC, this.name) .add(JRosbridge.FIELD_MESSAGE, message.toJsonObject()).build(); this.ros.send(call); } Topic(Ros ros, String name, String type);  Topic(Ros ros, String name, String type,
			JRosbridge.CompressionType compression);  Topic(Ros ros, String name, String type, int throttleRate);  Topic(Ros ros, String name, String type,
			JRosbridge.CompressionType compression, int throttleRate); Ros getRos(); String getName(); String getType(); boolean isAdvertised(); boolean isSubscribed(); JRosbridge.CompressionType getCompression(); int getThrottleRate(); void subscribe(TopicCallback cb); void unsubscribe(); void advertise(); void unadvertise(); void publish(Message message);  }### Answer:
@Test public void testPublish() { t1.advertise(); while (DummyHandler.latest == null) { Thread.yield(); } DummyHandler.latest = null; t1.publish(new Message("{\"test1\":\"test2\"}")); while (DummyHandler.latest == null) { Thread.yield(); } assertNotNull(DummyHandler.latest); assertEquals( "{\"op\":\"publish\",\"id\":\"publish:myTopic1:1\",\"topic\":\"myTopic1\"" + ",\"msg\":{\"test1\":\"test2\"}}", DummyHandler.latest.toString()); assertTrue(t1.isAdvertised()); assertFalse(t1.isSubscribed()); }