fix(examples/auth): add missing return; fix undefined; add policy; tests

[Lancer92]

Fixed example that was errors such as "headers already sent", "user is not defined", "invalid secret key" Added policy example (isAuthenticated) Added role policy example (isAdmin) Cover main routes by tests (except admin ones)

[benminer]

Hey @Lancer92! Thanks for the improvements! I'll check these out.

[Lancer92]

Hey

[emrahssamdan]

Thanks @Lancer92 for this!