class RuboCop::RSpec::Wording

def substitute(word)
  # NOTE: Custom replacements are case sensitive.
  return replacements.fetch(word) if replacements.key?(word)
  case word
  when ES_SUFFIX_PATTERN  then append_suffix(word, 'es')
  when IES_SUFFIX_PATTERN then append_suffix(word[0..-2], 'ies')
  else append_suffix(word, 's')
  end
end