fix uninitialized constant Responders::FlashResponder::ActionView

Author: linqueta

spec/spec_helper.rb

@@ -20,6 +20,7 @@
 require 'active_model'
 # require ActiveRecord to ensure that Ransack loads correctly
 require 'active_record'
+require 'action_view'
 require 'active_admin'
 ActiveAdmin.application.load_paths = [ENV['RAILS_ROOT'] + '/app/admin']
 require ENV['RAILS_ROOT'] + '/config/environment.rb'