mock-examples.groovy

class Publisher {
  List<Subscriber> subscribers = []
  void send(String message){
    subscribers*.receive(message)
  }
}

interface Subscriber {
  void receive(String message)
}

class PublisherSpec extends Specification {
  Publisher publisher = new Publisher()
  Subscriber subscriber1 = Mock()
  Subscriber subscriber2 = Mock()

  def setup() {
    publisher.subscribers << subscriber1 // << operador do Groovy para List.add()
    publisher.subscribers << subscriber2
  }
  
  def 'should send messages to all subscribers'() {
    when:
    publisher.send("hello")

    then:
    1 * subscriber1.receive("hello")
    1 * subscriber2.receive("hello")
  }
}