assertNull(ContextHolder.getContext());
    public void testDeconnexion() {        final Authentication    authentication = new TestingAuthenticationToken("admin",                "admin", new GrantedAuthority[0]);        final SecureContextImpl secureContext = new SecureContextImpl();        secureContext.setAuthentication(authentication);        ContextHolder.setContext(secureContext);        final MockHttpSession session = new MockHttpSession();        assertFalse(session.isInvalid());        final ModelAndView mav = accesController.deconnexion(newGet("/acces/deconnexion.html"),                null, session);        assertNotNull(mav);        assertEquals("acces/deconnexion", mav.getViewName());        assertTrue(session.isInvalid());    }