spock-organization.groovy

def 'Validate user registration'() {

  given: 'user data'
  def name = "Fulano"
  def age = 20
  def email = "fulano@mail.test"

  when: 'register the user'
  def user = UserService().register(name, age, email)

  then:
  with(user) {
    getName() == name
    getAge() == age
    getEmail() == email
  }
}