test_admin_non_admin_gets_404 asserted the same /admin 404 that
anonymous visitors also get, without first confirming the login
actually went through. A broken login (falls back to /connexion on
bad credentials, unverified email, etc.) would leave the session
anonymous and the test would keep passing for the wrong reason,
silently degrading into a duplicate of test_admin_anonymous_gets_404.
Now waits for the post-login redirect to /compte/abonnement (this
user has no subscription) before exercising the admin guard.
Colin Maudry
348da79175