Cassidoo Anagram Detector

anagram.rb

#!/usr/bin/env ruby

def anagram?(subject, test)
  (test.downcase.chars - subject.downcase.chars).none?
end

tests = {
  'evil' => 'vile',
  'a gentleman' => 'elegant man',
  'Santa' => 'Satan',
  'William Shakespeare' => 'I am a weakish speller',
  'Tom Marvolo Riddle' => 'I am Lord Voldemort',
  'race' => 'racer', # Valid with multuples of letters from the subject.
  'racer' => 'race', # Valid with only a single copy of each letter.
  'force' => 'farce'
}

tests.each do |s, t|
  puts "#{anagram?(s, t) ? 'true ' : 'false'} #{s} => #{t}"
end