NoMethodError: undefined method `env' for nil:NilClass ***/lib/active_support/whiny_nil.rb:48:in `method_missing' ***/lib/devise/test_helpers.rb:55:in `setup_controller_for_warden' include Devise::TestHelpers を入れる場所が間違ってた class ActiveSupport::TestCase ここではなく end class ActionController::TestCase こっち include Devise::TestHelpers end