Fix Rails generators (#720)

Author: santib

spec/rails_helper.rb

@@ -17,6 +17,8 @@
 require File.expand_path('../config/environment', __dir__)
 # Prevent database truncation if the environment is production
 abort('The Rails environment is running in production mode!') if Rails.env.production?
+return unless Rails.env.test?
+
 require 'rspec/core'
 require 'spec_helper'
 require 'rspec/rails'