Unit Test for a Java Component accessing ActiveMq in Mule Flow - unit-testing

Question

I have the below Java Class which retrieve messages from JMS queue. This class is invoked in a mule flow. Could you please advice on how I can write a Junit for this class? I have tried to create a standalone broker but I am having trouble
public Object getMessages(final MuleEventContext eventContext)
{
final String consumerID = eventContext.getMessage().getProperty("consumerID", PropertyScope.INVOCATION);
final String messageSelector = "ConsumerID = '" + consumerID + "'";
JmsConnector amqConnector = (JmsConnector) eventContext.getMuleContext().getRegistry().lookupConnector("Active_MQ");
ConnectionFactory factory = amqConnector.getConnectionFactory();
Connection connection = null;
List<String> listOfMessages = null;
try
{
connection = factory.createConnection();
//Consumer Settings
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
Queue queue = session.createQueue(queuename");
MessageConsumer consumer = session.createConsumer(queue, messageSelector);
//Browser Settings
Session sessionBrowser = amqConnector.getSession( false, false );
Queue queueBrowser = sessionBrowser.createQueue( queuename );
QueueBrowser qBrowser = sessionBrowser.createBrowser( queueBrowser, messageSelector );
Enumeration<Message> enumeration = qBrowser.getEnumeration();
connection.start();
listOfMessages = new ArrayList<String>();
while (enumeration.hasMoreElements())
{
enumeration.nextElement();
Message message = consumer.receive();
TextMessage msg = (TextMessage) message;
listOfMessages.add(msg.getText());
}
//Close Browser Settings
qBrowser.close(); sessionBrowser.close();
//Close Consumer Settings
consumer.close(); session.close();
//Close Connection
connection.close();
}
catch ( Exception e )
{
throw new RuntimeException("Unable to retrieve messages from Queue "+ e);
}
}

Answer 1

You can create FunctionalTestCase, and then:
Test the class directly by calling the method, or
Test the whole scenario by calling the flow
public class MessageServiceTest extends FunctionalTestCase {
#Test
public void testJavaClass() throws Exception {
MuleEventContext eventContext = MuleTestUtils.getTestEventContext("", MessageExchangePattern.REQUEST_RESPONSE, muleContext);
MessageService messageService = new MessageService();
assertNotNull(messageService.getMessages(eventContext));
}
#Test
public void testFlow() throws Exception {
MuleEvent event = runFlow("messageserviceFlow");
MuleMessage message = event.getMessage();
assertNotNull(message);
assertNotNull(message.getPayload());
}
protected String getConfigResources() {
return "messageservice.xml";
}
}