### Question:
Ros { public void authenticate(String mac, String client, String dest, String rand, int t, String level, int end) { JsonObject call = Json.createObjectBuilder() .add(JRosbridge.FIELD_OP, JRosbridge.OP_CODE_AUTH) .add(JRosbridge.FIELD_MAC, mac) .add(JRosbridge.FIELD_CLIENT, client) .add(JRosbridge.FIELD_DESTINATION, dest) .add(JRosbridge.FIELD_RAND, rand).add(JRosbridge.FIELD_TIME, t) .add(JRosbridge.FIELD_LEVEL, level) .add(JRosbridge.FIELD_END_TIME, end).build(); this.send(call); } Ros();  Ros(String hostname);  Ros(String hostname, int port);  Ros(String hostname, int port, JRosbridge.WebSocketType protocol); String getHostname(); int getPort(); JRosbridge.WebSocketType getProtocol(); String getURL(); long nextId(); void addRosHandler(RosHandler handler); boolean connect(); boolean disconnect(); boolean isConnected(); @OnOpen void onOpen(Session session); @OnClose void onClose(Session session); @OnError void onError(Session session, Throwable t); @OnMessage void onMessage(String message); boolean send(JsonObject jsonObject); void authenticate(String mac, String client, String dest,
			String rand, int t, String level, int end); void registerTopicCallback(String topic, TopicCallback cb); void deregisterTopicCallback(String topic, TopicCallback cb); void registerServiceCallback(String serviceCallId, ServiceCallback cb); void registerCallServiceCallback(String serviceName, CallServiceCallback cb); void deregisterCallServiceCallback(String serviceName); static final String DEFAULT_HOSTNAME; static final int DEFAULT_PORT; }### Answer:
@Test public void testAuthenticate() { assertTrue(r1.connect()); r1.authenticate("test1", "test2", "test3", "test4", 5, "test5", 10); while (DummyHandler.latest == null) { Thread.yield(); } assertNotNull(DummyHandler.latest); assertEquals(8, DummyHandler.latest.size()); assertEquals(JRosbridge.OP_CODE_AUTH, DummyHandler.latest.getString(JRosbridge.FIELD_OP)); assertEquals("test1", DummyHandler.latest.getString(JRosbridge.FIELD_MAC)); assertEquals("test2", DummyHandler.latest.getString(JRosbridge.FIELD_CLIENT)); assertEquals("test3", DummyHandler.latest .getString(JRosbridge.FIELD_DESTINATION)); assertEquals("test4", DummyHandler.latest.getString(JRosbridge.FIELD_RAND)); assertEquals(5, DummyHandler.latest.getInt(JRosbridge.FIELD_TIME)); assertEquals("test5", DummyHandler.latest.getString(JRosbridge.FIELD_LEVEL)); assertEquals(10, DummyHandler.latest.getInt(JRosbridge.FIELD_END_TIME)); }