repoze.who-testutil is a repoze.who plugin which modifies repoze.who's original middleware to make it easier to forge authentication, without bypassing identification (this is, running the metadata providers). It's been created to ease testing of repoze.who-powered applications, in a way independent of the identifiers, authenticators and challengers used originally by your application, so that you won't have to update your test suite as your application grows and the authentication method changes. WWW: http://code.gustavonarea.net/repoze.who-testutil/