def list
      files = Dir.glob("#{coverage_dir}/*.html")
      files.map { |file| File.basename(file) }
    end
def list
      files = Dir.glob("#{coverage_dir}/*.html")
      files.map { |file| File.basename(file) }
    end
Public: I list the html files from the directory where the HTML
 report is stored.

 Returns nothing.