def results(analyser)
      r = analyser.results
      [0, nil].map do |val|
        r.select { |node, runs| runs == val }
         .keys
         .map(&:source)
      end
    end
def results(analyser)
      r = analyser.results
      [0, nil].map do |val|
        r.select { |node, runs| runs == val }
         .keys
         .map(&:source)
      end
    end
returns not_covered, ignored