module ActionController::TestCase::Behavior

def scrub_env!(env)
  env.delete_if do |k, _|
    k.start_with?("rack.request", "action_dispatch.request", "action_dispatch.rescue")
  end
  env["rack.input"] = StringIO.new
  env.delete "CONTENT_LENGTH"
  env.delete "RAW_POST_DATA"
  env
end