when(authentication.isAuthenticated()).thenReturn(true);
when(request.getParameter("requestToken")).thenReturn("tok");
when(tokenServices.getToken("tok")).thenReturn(token);
when(vs.createVerifier()).thenReturn("verifier");
tokenServices.authorizeRequestToken("tok", "verifier", authentication);
filter.setTokenServices(tokenServices);
filter.attemptAuthentication(request, response);
verify(request).setAttribute(UserAuthorizationProcessingFilter.CALLBACK_ATTRIBUTE, "callback");