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Mockrunner is a lightweight framework for unit testing applications in the J2EE environment. It supports servlets, filters, tag classes and Struts actions. It includes a JDBC a JMS and a JCA test framework and can be used to test EJB based applications.
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package com.mockrunner.test.jms;

import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.Session;

import junit.framework.TestCase;

import com.mockrunner.jms.ConfigurationManager;
import com.mockrunner.jms.DestinationManager;
import com.mockrunner.mock.jms.MockMessage;
import com.mockrunner.mock.jms.MockQueue;
import com.mockrunner.mock.jms.MockQueueConnection;
import com.mockrunner.mock.jms.MockQueueReceiver;
import com.mockrunner.mock.jms.MockQueueSession;
import com.mockrunner.mock.jms.MockTextMessage;

public class MockQueueTest extends TestCase
{
    private MockQueueConnection connection;
    private MockQueue queue;
    
    protected void setUp() throws Exception
    {
        super.setUp();
        DestinationManager destManager = new DestinationManager();
        ConfigurationManager confManager = new ConfigurationManager();
        connection = new MockQueueConnection(destManager, confManager);
        queue = new MockQueue("TestQueue");
    }

    public void testGetMessageList() throws Exception
    {
        assertTrue(queue.isEmpty());
        assertEquals(0, queue.getCurrentMessageList().size());
        assertEquals(0, queue.getReceivedMessageList().size());
        assertNull(queue.getMessage());
        queue.addMessage(new MockTextMessage("test1"));
        queue.addMessage(new MockTextMessage("test2"));
        queue.addMessage(new MockTextMessage("test3"));
        assertFalse(queue.isEmpty());
        assertEquals(3, queue.getCurrentMessageList().size());
        assertEquals(3, queue.getReceivedMessageList().size());
        assertEquals(new MockTextMessage("test1"), queue.getMessage());
        assertFalse(queue.isEmpty());
        assertEquals(2, queue.getCurrentMessageList().size());
        assertEquals(3, queue.getReceivedMessageList().size());
        assertEquals(new MockTextMessage("test2"), queue.getMessage());
        assertFalse(queue.isEmpty());
        assertEquals(1, queue.getCurrentMessageList().size());
        assertEquals(3, queue.getReceivedMessageList().size());
        assertEquals(new MockTextMessage("test3"), queue.getMessage());
        assertTrue(queue.isEmpty());
        assertEquals(0, queue.getCurrentMessageList().size());
        assertEquals(3, queue.getReceivedMessageList().size());
        assertNull(queue.getMessage());
    }
    
    public void testLoadMessage() throws Exception
    {
        MockQueueSession session = new MockQueueSession(connection, false, Session.CLIENT_ACKNOWLEDGE);
        queue.addSession(session);
        queue.loadMessage(new MockTextMessage("test1"));
        queue.loadMessage(new MockTextMessage("test2"));
        assertEquals(2, queue.getCurrentMessageList().size());
        assertEquals(0, queue.getReceivedMessageList().size());
        assertEquals(new MockTextMessage("test1"), queue.getCurrentMessageList().get(0));
        assertEquals(new MockTextMessage("test2"), queue.getCurrentMessageList().get(1));
    }
    
    public void testAddMessage() throws Exception
    {
        MockQueueSession session = new MockQueueSession(connection, false, Session.CLIENT_ACKNOWLEDGE);
        queue.addSession(session);
        queue.addMessage(new MockTextMessage("test"));
        assertEquals(1, queue.getCurrentMessageList().size());
        assertEquals(1, queue.getReceivedMessageList().size());
        assertEquals(new MockTextMessage("test"), queue.getMessage());
        TestMessageListener listener1 = new TestMessageListener();
        TestMessageListener listener2 = new TestMessageListener();
        MockQueueReceiver receiver1 = (MockQueueReceiver)session.createReceiver(queue);
        session.setMessageListener(listener1);
        receiver1.setMessageListener(listener2);
        queue.reset();
        queue.addMessage(new MockTextMessage("test"));
        assertEquals(0, queue.getCurrentMessageList().size());
        assertEquals(1, queue.getReceivedMessageList().size());
        assertNull(queue.getMessage());
        assertEquals(new MockTextMessage("test"), listener1.getMessage());
        assertFalse(((MockMessage)listener1.getMessage()).isAcknowledged());
        assertNull(listener2.getMessage());
        session.setMessageListener(null);
        queue.reset();
        listener1.reset();
        listener2.reset();
        queue.addMessage(new MockTextMessage("test"));
        assertEquals(0, queue.getCurrentMessageList().size());
        assertEquals(1, queue.getReceivedMessageList().size());
        assertNull(queue.getMessage());
        assertEquals(new MockTextMessage("test"), listener2.getMessage());
        assertFalse(((MockMessage)listener2.getMessage()).isAcknowledged());
        assertNull(listener1.getMessage());
        queue.reset();
        listener1.reset();
        listener2.reset();
        MockQueueReceiver receiver2 = (MockQueueReceiver)session.createReceiver(queue);
        receiver1.setMessageListener(null);
        receiver2.setMessageListener(listener2);
        queue.addMessage(new MockTextMessage("test"));
        assertEquals(0, queue.getCurrentMessageList().size());
        assertEquals(1, queue.getReceivedMessageList().size());
        assertNull(queue.getMessage());
        assertEquals(new MockTextMessage("test"), listener2.getMessage());
        assertFalse(((MockMessage)listener2.getMessage()).isAcknowledged());
        assertNull(listener1.getMessage());
        queue.reset();
        listener1.reset();
        listener2.reset();
        receiver1.setMessageListener(listener1);
        receiver1.close();
        queue.addMessage(new MockTextMessage("test"));
        assertEquals(0, queue.getCurrentMessageList().size());
        assertEquals(1, queue.getReceivedMessageList().size());
        assertNull(queue.getMessage());
        assertEquals(new MockTextMessage("test"), listener2.getMessage());
        assertFalse(((MockMessage)listener2.getMessage()).isAcknowledged());
        assertNull(listener1.getMessage());
        queue.reset();
        listener1.reset();
        listener2.reset();
        receiver2.close();
        queue.addMessage(new MockTextMessage("test"));
        assertEquals(1, queue.getCurrentMessageList().size());
        assertEquals(1, queue.getReceivedMessageList().size());
        assertNull(listener1.getMessage());
        assertNull(listener2.getMessage());
        assertEquals(new MockTextMessage("test"), queue.getMessage());
    }
    
    public void testAddMessageAutoAcknowledge() throws Exception
    {
        MockQueueSession session = new MockQueueSession(connection, false, Session.AUTO_ACKNOWLEDGE);
        doTestAcknowledge(session);    
    }

    public void testAddMessageDupOkAcknowledge() throws Exception
    {
        MockQueueSession session = new MockQueueSession(connection, false, Session.DUPS_OK_ACKNOWLEDGE);
        doTestAcknowledge(session);    
    }
    
    private void doTestAcknowledge(MockQueueSession session) throws Exception
    {
        queue.addSession(session);
        MockTextMessage message = new MockTextMessage("text");
        queue.addMessage(message);
        assertFalse(message.isAcknowledged());
        message = new MockTextMessage("text");
        TestMessageListener listener = new TestMessageListener();
        session.setMessageListener(listener);
        queue.addMessage(message);
        assertTrue(message.isAcknowledged());
        session.setMessageListener(null);
        message = new MockTextMessage("text");
        MockQueueReceiver receiver = (MockQueueReceiver)session.createReceiver(queue);
        receiver.setMessageListener(listener);
        queue.addMessage(message);
        assertTrue(message.isAcknowledged());
        receiver.setMessageListener(null);
        message = new MockTextMessage("text");
        queue.addMessage(message);
        assertFalse(message.isAcknowledged());
    }
    
    public static class TestMessageListener implements MessageListener
    {
        private Message message;
    
        public Message getMessage()
        {
            return message;
        }
    
        public void reset()
        {
            message = null;
        }
    
        public void onMessage(Message message)
        {
            this.message = message;
        }
    }
}