class ParallelTests

def self.summarize_results(results)
  results = results.join(' ').gsub(/s\b/,'') # combine and singularize results
  counts = results.scan(/(\d+) (\w+)/)
  sums = counts.inject(Hash.new(0)) do |sum, (number, word)|
    sum[word] += number.to_i
    sum
  end
  sums.sort.map{|word, number|  "#{number} #{word}#{'s' if number != 1}" }.join(', ')
end