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https://stackoverflow.com/questions/8043956/rspec-2-7-access-controller-session-in-spec-before-making-request/13369734
https://github.com/plataformatec/devise/wiki/How-To:-sign-in-and-out-a-user-in-Request-type-specs-(specs-tagged-with-type:-:request)
https://github.com/rspec/rspec-rails/issues/825
https://makandracards.com/makandra/37161-rspec-devise-how-to-sign-in-users-in-request-specs
https://makandracards.com/makandra/11507-using-before-all-in-rspec-will-cause-you-lots-of-trouble-unless-you-know-what-you-are-doing
https://relishapp.com/rspec/rspec-rails/docs/controller-specs/cookies
https://dzone.com/articles/rspec-let-vs-before
https://medium.com/carwow-product-engineering/test-behaviour-with-request-specs-rather-than-testing-implementation-with-controller-specs-f4ebbe13f983
https://thoughtbot.com/blog/how-we-test-rails-applications
https://8thlight.com/blog/mike-knepper/2014/07/01/stubbing-authentication-and-authorization-in-controller-specs.html
https://www.natashatherobot.com/rails-test-omniauth-sessions-controller/
https://codevog.com/de/blog/2015-04-15-unit-testing-with-rspec
https://qiita.com/Kolosek/items/7d7bc8429969ec6a3435