Fix all the errors to get our tests green on Rails 5.1.

spec/requests/admin/admin_controller_spec.rb

@@ -3,7 +3,7 @@ require 'rails_helper'
 RSpec.describe Admin::AdminController do
   it "should return the right response if user isn't a staff" do
     expect do
-      get "/admin", api_key: 'asdiasiduga'
+      get "/admin", params: { api_key: 'asdiasiduga' }
     end.to raise_error(ActionController::RoutingError)
   end
 end