exercise: WordCount
version: 3
plan: 11
tests: |-
  is-deeply (% = .<input><sentence>.&count-words), |.<expected description> for @($c-data<cases>);

unit: module
example: |-
  sub count-words (Str:D $str --> Hash:D) is export {
    $str.lc.comb(/ <alnum>+ (\'<alnum>+)? /).Bag.hash
  }
stub: |-
  sub count-words ($str) is export {
  }