Grails- Web Flow Spring-重定向错误在单元测试中

Question

我想在单元测试中测试grails-app中的web流程。 我有重定向错误。

网络流程的代码是：

def redesignSignup = {
        redirect(action: "signupRedesign")
    }

//  Responsible for the new signup flow
    def signupRedesignFlow = {
        start {
            on("yes").to"createAccount"
        }
        createAccount{
            on("next"){
                flow.step = 2
                flash.name = "flash"}.to"congrats"
            on("back"){}.to "start"
        }

        congrats {
            redirect(controller: "connection", action: "details", params: [newUser: true])
        }

    }

单元测试的代码是：

class WizardControllerSpec extends Specification {

    def "test next"(){
//        step1->step2
        when:"user click yes in start"
        then:"next page is create account"
        assert "createAccount" == signupRedesignFlow.start.on.yes.to

        when:"user click next in createAccount"
        then:"next page is connectPeople"
        assert "connectPeople" == signupRedesignFlow.createAccount.on.next.to


        when:"user click next in invitePartners"
        then:"next page is congrats"
        assert "congrats" == signupRedesignFlow.invitePartners.on.next.to

    }

我得到的错误是： org.codehaus.groovy.grails.web.servlet.mvc.exceptions.CannotRedirectException：无法在此处发出重定向（..）。之前调用重定向（..）

**注意到即使在恭喜中调用重定向也没有测试