# File lib/dm-core/spec/setup.rb, line 55
      def require_plugins
        plugins = ENV['PLUGINS'] || ENV['PLUGIN']
        plugins = plugins.to_s.split(/[,\s]+/)
        unless ENV['ADAPTER'] == 'in_memory'
          plugins.push('dm-migrations')
        end
        plugins.uniq.each { |plugin| require plugin }
      end