def present_subscribers
      subs = {}
      subscribers.each do |k, v|
        unless v.empty?
          subs[k] = v
        end
      end
      subs
    end
def present_subscribers
      subs = {}
      subscribers.each do |k, v|
        unless v.empty?
          subs[k] = v
        end
      end
      subs
    end
#subscribers writes to the subscribers even when reading them,
 confusing the tests.
 This method returns only events with populated subscribers.