class Shoulda::Matchers::ActiveModel::ValidateComparisonOfMatcher

def build_submatcher_failure_message_for(
  submatcher,
  failure_message_method
)
  failure_message = submatcher.public_send(failure_message_method)
  submatcher_description = submatcher.simple_description.
    sub(/\bvalidate that\b/, 'validates').
    sub(/\bdisallow\b/, 'disallows').
    sub(/\ballow\b/, 'allows')
  submatcher_message =
    if number_of_submatchers_for_failure_message > 1
      "In checking that #{model.name} #{submatcher_description}, " +
        failure_message[0].downcase +
        failure_message[1..]
    else
      failure_message
    end
  Shoulda::Matchers.word_wrap(submatcher_message, indent: 2)
end