Integration test, Error while extending SeamTest

[mach31]

Hello i would like to make Integrations tests for my Seam Statefull Bean and i have error that i can't solve, despite my research.

I have a Seam EJB, wich contains a POJO, wich contains my EntityBean.

@Stateful
@Scope(ScopeType.CONVERSATION)
@Name("ejbSeam")
public class EJBSeam implements
        EJBSeamLocale {

    private static final Logger aLogger =
            Logger.getLogger(EJBSeam.class);

    @PersistenceContext(type = PersistenceContextType.EXTENDED, unitName = "MyUnitName")
    private EntityManager em;

    @In(required = false)
    @Out(required = false)
    private APojo myPojoWichContainsEJBEntity;

    @EJB
    private AnInterfaceLocal MyEJBActions;

    private Boolean actionPossible;

    private String errorMessage;

...
}

If I code an Integration Test wihtout extending SeamTest and without JSF actions, it works.

"
@Test
public class TestCFA {

    private EntityManagerFactory emf;

    private EJBActionClass anEJB;

    private EntityManager em;

    @BeforeTest
    public void init() {
        emf = Persistence.createEntityManagerFactory("formCoTestUnit");
    }

 private void initEJB() {
        em = emf.createEntityManager();
        EJBSeam myEjbSeam= new EJBSeam();
        EJBActionClass  ejbAction = new EJBActionClass();
        myEjbSeam.setEm(em);
        myEjbSeam.setEJBActionClass(ejbAction);
    }

 public void testPrepareAdd() {
        initEJB();
        assert "addInitialized".equals(myEjbSeam.prepareAddSomething());
       
    }

    @AfterTest
    public void destroy() {
        System.out.println("aprs test");
    }

}"

If I extends SeamTest with the same code, I obtain this error:

DEBUG [main] (Lifecycle.java:261) - End of session, destroying contexts
FAILED CONFIGURATION: @AfterMethod end
java.lang.NullPointerException
        at org.jboss.seam.contexts.WebApplicationContext.get(WebApplicationContext.java:48)
        at org.jboss.seam.Component.forName(Component.java:1579)
        at org.jboss.seam.Component.getInstance(Component.java:1627)
        at org.jboss.seam.Component.getInstance(Component.java:1622)
        at org.jboss.seam.Component.getInstance(Component.java:1599)
        at org.jboss.seam.Component.getInstance(Component.java:1594)
        at org.jboss.seam.core.ConversationEntries.instance(ConversationEntries.java:91)
        at org.jboss.seam.contexts.Lifecycle.endSession(Lifecycle.java:284)
        at org.jboss.seam.mock.SeamTest.end(SeamTest.java:676)
... Removed 24 stack frames

I read the posts about this error, but anything i tried don't solve my problem.
I have Seam 1.2.1GA, TestNG 5.7 with Eclipse plugin.
I moved all -embedded.jar files in first position in the classpath without result.
I don't have two Seam jar files in the same classpath.

If anyone could help me...
Thanks in advance.