def uncovered_count
      not_covered_enough.select do |_, hits|
        CoverageStat.coverage_percent(hits).zero?
      end.size
    end
def uncovered_count
      not_covered_enough.select do |_, hits|
        CoverageStat.coverage_percent(hits).zero?
      end.size
    end
Public: Count the number of uncovered files, that is, files with a
 coverage rate of 0%.

 Returns the Fixnum number of uncovered files.