ActionProxy proxy = actionProxyFactory.createActionProxy("", MockConfigurationProvider.PARAM_INTERCEPTOR_ACTION_NAME, extraContext);
ValueStack stack = proxy.getInvocation().getStack();
HashMap<String, Object> session = new HashMap<String, Object>();
stack.getContext().put("session", session);
proxy.execute();
assertEquals("This is blah", ((SimpleAction) proxy.getAction()).getBlah());
assertNull(session.get("foo"));
assertNull(session.get("user"));
assertNull(session.get("user2"));
assertNull(session.get("user3"));