EDIT

package eu.etaxonomy.cdm.vaadin;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import javax.servlet.ServletException;

import javax.sql.DataSource;

import org.easymock.EasyMock;

import org.junit.Assert;

import org.junit.BeforeClass;

import org.junit.Test;

import org.springframework.mock.web.MockServletConfig;

import org.springframework.mock.web.MockServletContext;

import org.springframework.web.context.ContextLoaderListener;

import org.springframework.web.context.support.XmlWebApplicationContext;

import org.unitils.UnitilsJUnit4;

import org.unitils.database.annotations.TestDataSource;

import org.unitils.database.annotations.Transactional;

import org.unitils.database.util.TransactionMode;

import com.vaadin.server.DeploymentConfiguration;

import com.vaadin.server.ServiceException;

import com.vaadin.server.VaadinService;

import com.vaadin.server.VaadinServlet;

import com.vaadin.server.VaadinServletService;

import com.vaadin.server.VaadinSession;

@Transactional(TransactionMode.DISABLED)

public class CdmVaadinBaseTest extends UnitilsJUnit4 {

    private static MockServletContext servletContext;

    private static VaadinServlet vaadinServlet;

    private static VaadinServletService vaadinService;

    private static VaadinSession vaadinSession;

    private static boolean isVaadinServletEnvCreated = false;

    @TestDataSource

    protected DataSource dataSource;

    @BeforeClass

    public static void setup() {

    	if(!isVaadinServletEnvCreated) {

    		createNewServletEnvironment();

    	}

    }

    public static void createNewServletEnvironment() {

		servletContext = new MockServletContext("/webapp");		  

        ServletContextListener listener = new ContextLoaderListener();

        ServletContextEvent event = new ServletContextEvent(servletContext);

		listener.contextInitialized(event);        

		MockServletConfig servletConfig = new MockServletConfig(servletContext);

		vaadinServlet = new VaadinServlet();

		try {

			vaadinServlet.init(servletConfig);

		} catch (ServletException e) {

			throw new RuntimeException(e);

		}						

		try {

			vaadinService = new VaadinServletService(vaadinServlet,

			        EasyMock.createMock(DeploymentConfiguration.class));

		} catch (ServiceException e) {

			throw new RuntimeException(e);

		}

		VaadinService.setCurrent(vaadinService);

		vaadinSession = new VaadinSession(vaadinService);

		VaadinSession.setCurrent(vaadinSession);	

		isVaadinServletEnvCreated = true;

    }

    public DataSource getDataSource() {

    	return dataSource;

    }

    @Test

    public void checkVaadinVariables() {

		Assert.assertEquals(vaadinServlet, VaadinServlet.getCurrent());

		Assert.assertEquals(servletContext, VaadinServlet.getCurrent().getServletContext());

		Assert.assertEquals(vaadinSession, VaadinSession.getCurrent());

		Assert.assertEquals(vaadinService, VaadinService.getCurrent());

    }

}