Add tests for Ability

[svenfuchs]

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[runlevel5]

@svenfuchs wanna pair?

[svenfuchs]

@joneslee85 while i'd love to, i'm pretty swamped with looking for sponsors atm. if you wanna own this then that would be super appreciated :)

[juuh42dias]

@carpodaster what is the status of this task?

[carpodaster]

@juuh42dias still a valid one, although this could probably also mean checking which setting in ability.rb we still need – quite a few authorization hooks should be obsolete by our different namespaces.