class RuboCop::Cop::RSpec::MessageSpies

def on_send(node)
  receive_message_matcher(node) do |receiver, message_matcher|
    return correct_style_detected if preferred_style?(message_matcher)
    add_offense(
      message_matcher.loc.selector,
      message: error_message(receiver)
    ) { opposite_style_detected }
  end
end