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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.mock.web;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Vector;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionContext;

/**
 * Mock implementation of HttpSession.
 */
public class MockHttpSession implements HttpSession
{
    private HashMap attributes;
    private String sessionId;
    private boolean isNew;
    private boolean isValid;
    private long creationTime;
    private ServletContext servletContext;
    private int maxInactiveInterval;
    private List attributeListener;

    public MockHttpSession()
    {
        resetAll();
    }
    
    /**
     * Resets the state of this object to the default values
     */
    public synchronized void resetAll()
    {
        attributes = new HashMap();
        isValid = true;
        creationTime = System.currentTimeMillis();
        sessionId = new Double(Math.random()).toString();
        maxInactiveInterval = -1;
        attributeListener = new ArrayList();
    }

    public synchronized void addAttributeListener(HttpSessionAttributeListener listener)
    {
        attributeListener.add(listener);
    }

    /**
     * Set the ServletContext.
     * @param servletContext the ServletContext
     */
    public synchronized void setupServletContext(ServletContext servletContext)
    {
        this.servletContext = servletContext;
    }

    public synchronized ServletContext getServletContext()
    {
        return servletContext;
    }
    
    public synchronized boolean isValid()
    {
        return isValid;
    }

    public synchronized boolean isNew()
    {
        return isNew;
    }

    public synchronized void setUpIsNew(boolean isNew)
    {
        this.isNew = isNew;
    }

    public synchronized long getCreationTime()
    {
        return creationTime;
    }

    public synchronized void invalidate()
    {
        if (!isValid) throw new IllegalStateException("session invalid");
        isValid = false;
        Map clone = new HashMap(attributes);
        Iterator keys = clone.keySet().iterator();
        while (keys.hasNext())
        {
            doRemoveAttribute((String)keys.next());
        } 
    }

    public synchronized String getId()
    {
        return sessionId;
    }

    public synchronized Object getValue(String key)
    {
        if (!isValid) throw new IllegalStateException("session invalid");
        return getAttribute(key);
    }

    public synchronized String[] getValueNames()
    {
        if (!isValid) throw new IllegalStateException("session invalid");
        Vector attKeys = new Vector(attributes.keySet());
        return (String[]) attKeys.toArray();
    }

    public synchronized void putValue(String key, Object value)
    {
        if (!isValid) throw new IllegalStateException("session invalid");
        setAttribute(key, value);
    }

    public synchronized void removeValue(String key)
    {
        if (!isValid) throw new IllegalStateException("session invalid");
        removeAttribute(key);
    }
    
    public synchronized void clearAttributes()
    {
        attributes.clear();
    }

    public synchronized Object getAttribute(String key)
    {
        if (!isValid) throw new IllegalStateException("session invalid");
        return attributes.get(key);
    }

    public synchronized Enumeration getAttributeNames()
    {
        if (!isValid) throw new IllegalStateException("session invalid");
        Vector attKeys = new Vector(attributes.keySet());
        return attKeys.elements();
    }

    public synchronized void removeAttribute(String key)
    {
        if (!isValid) throw new IllegalStateException("session invalid");
        doRemoveAttribute(key);
    }

    private void doRemoveAttribute(String key)
    {
        Object value = attributes.get(key);
        attributes.remove(key);
        if(null != value)
        {
            callValueUnboundMethod(key, value);
            callAttributeListenersRemovedMethod(key, value);
        }
    }

    public synchronized void setAttribute(String key, Object value)
    {
        if (!isValid) throw new IllegalStateException("session invalid");
        Object oldValue = attributes.get(key); 
        if(null == value)
        {
            attributes.remove(key);
        }
        else
        {
            attributes.put(key, value);
        }
        handleBindingListenerCalls(key, value, oldValue);
        handleAttributeListenerCalls(key, value, oldValue);
    }

    private synchronized void handleBindingListenerCalls(String key, Object value, Object oldValue)
    {
        if(oldValue != null)
        {
            callValueUnboundMethod(key, oldValue);
        }
        if(value != null)
        {
            callValueBoundMethod(key, value);
        }
    }

    private synchronized void handleAttributeListenerCalls(String key, Object value, Object oldValue)
    {
        if(null != oldValue)
        {
            if(value != null)
            {
                callAttributeListenersReplacedMethod(key, oldValue);
            }
            else
            {
                callAttributeListenersRemovedMethod(key, oldValue);
            }
        }
        else
        {
            if(value != null)
            {
                callAttributeListenersAddedMethod(key, value);
            }
        
        }
    }
    
    public synchronized long getLastAccessedTime()
    {
        return System.currentTimeMillis();
    }
    
    public synchronized void setMaxInactiveInterval(int maxInactiveInterval)
    {
        this.maxInactiveInterval = maxInactiveInterval;
    }

    public synchronized int getMaxInactiveInterval()
    {
        return maxInactiveInterval;
    }

    public synchronized HttpSessionContext getSessionContext()
    {
        return new MockSessionContext();
    }
    
    private synchronized void callAttributeListenersAddedMethod(String key, Object value)
    {
        for(int ii = 0; ii < attributeListener.size(); ii++)
        {
            HttpSessionBindingEvent event = new HttpSessionBindingEvent(this, key, value);
            ((HttpSessionAttributeListener)attributeListener.get(ii)).attributeAdded(event);
        }
    }

    private synchronized void callAttributeListenersReplacedMethod(String key, Object value)
    {
        for(int ii = 0; ii < attributeListener.size(); ii++)
        {
            HttpSessionBindingEvent event = new HttpSessionBindingEvent(this, key, value);
            ((HttpSessionAttributeListener)attributeListener.get(ii)).attributeReplaced(event);
        }
    }

    private synchronized void callAttributeListenersRemovedMethod(String key, Object value)
    {
        for(int ii = 0; ii < attributeListener.size(); ii++)
        {
            HttpSessionBindingEvent event = new HttpSessionBindingEvent(this, key, value);
            ((HttpSessionAttributeListener)attributeListener.get(ii)).attributeRemoved(event);
        }
    }

    private synchronized void callValueBoundMethod(String key, Object value)
    {
        if (value instanceof HttpSessionBindingListener)
        {
            HttpSessionBindingEvent event = new HttpSessionBindingEvent(this, key, value);
            ((HttpSessionBindingListener) value).valueBound(event);
        }
    }

    private synchronized void callValueUnboundMethod(String key, Object value)
    {
        if (value instanceof HttpSessionBindingListener)
        {
            HttpSessionBindingEvent event = new HttpSessionBindingEvent(this, key, value);
            ((HttpSessionBindingListener) value).valueUnbound(event);
        }
    }
}