Fix spec config

spec/rails_helper.rb

@@ -48,7 +48,7 @@ rescue ActiveRecord::PendingMigrationError => e
 end
 RSpec.configure do |config|
   # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
-  config.fixture_path = "#{::Rails.root}/spec/fixtures"
+  config.fixture_path = Rails.root.join('fixtures').to_s
 
   # If you're not using ActiveRecord, or you'd prefer not to run each of your
   # examples within a transaction, remove the following line or assign false