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Just curious. How is the @controller instance variable inside the controller specs being instantiated? And where?

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I believe this is actually being done by ActionController::TestCase::Behavior#setup_controller_request_and_response, which is wired up by RSpec::Rails::SetupAndTeardownAdapter#setup, which is included by RSpec::Rails::RailsExampleGroup and used by RSpec::Rails::ControllerExampleGroup. :)

bundle open rspec-rails is an easy way to start looking at how this stuff works.

HTH!

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