SpringBoot Spock test send email

EmailServiceTest.java

package ru.mailer.service

import com.icegreen.greenmail.util.GreenMail
import com.icegreen.greenmail.util.ServerSetup
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.boot.test.context.SpringBootTest
import ru.mailer.mq.model.MessageDto
import spock.lang.Shared
import spock.lang.Specification

import javax.mail.Message

/**
 * Created by Dmitry Tkachenko on 18.06.18
 */
@SpringBootTest
class EmailServiceTest extends Specification {

    @Autowired
    EmailService emailService

    @Shared
    GreenMail greenMail

    def setupSpec() {
        def setup = new ServerSetup(3025, "localhost", "smtp")
        greenMail = new GreenMail(setup)
        greenMail.start()
    }

    def cleanupSpec() {
        greenMail.stop()
    }

    def "SendEmail"() {
        given:
        def messageDto = createMessageDto()

        when:
        emailService.sendEmail(messageDto)
        Message[] messages = greenMail.getReceivedMessages()
        println(messages[0].getContent())

        then:
        messages.length == 1
    }

    def createMessageDto() {
        def dto = new MessageDto()
        dto.from = '[email protected]'
        dto.to = '[email protected]'
        dto.subject = 'my subject'
        dto.phone = '89999999999'
        dto.body = 'my body'
        dto
    }
}