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If wed like to quickly test if an ability class is giving the correct permissions,we can initialize an ability in the console or on another context with the rails environment loaded, just pass an user instance to test against

test_ability = Ability.new(User.first)
test_ability.can?(:show, Post) #=> true
other_ability = Ability.new(RestrictedUser.first)
other_ability.cannot?(:show, Post) #=> true

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For more infomattion about test: https://github.com/ryanb/cancan/wiki/Testing-Abilities

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