即使使用Spock的Mock（）模拟底层控制器，该方法为什么返回null？

Question

import grails.plugin.spock.* 

class EventControllerSpec extends ControllerSpec { 

    def "Creating a breadcrumb from an event"() { 
     given: "I have a named event" 
     def eventController = Mock(EventController) 
     def event = Mock(Event) 
     event.title >> 'Space-Journey with Sprock and the Crew' 
     event.title == 'Space-Journey with Sprock and the Crew' 

     when: "I create a breadcrumb from it" 
     def eventCrumb = eventController.createCrumb("Event", "show", "1", event.title) 

     /* 
     private Map createCrumb (String controllerName, String actionName, String id, String msg) { 
     msg = (msg ? msg : "cr.breadcrumb.${controllerName}.${actionName}") 
     [ 'controller':controllerName, 
     'action':actionName, 
     'id':id, 
     'message':msg 
     ] 
     */ 

     then: "I receive a map where the message-value is the events' title" 
     eventCrumb.message == event.title 
    } 
} 

注意注释掉的方法是在EventController

1. 为什么片断原因“不能空对象上获取属性‘消息’”？
2. 如何正确设置代码片段？
3. 一般情况下，会/不会，我需要的任何mockTagLib，mockController，mockLogging GrailsUnitTestCase功能使用斯波克什么时候？

Answer 1

如果您正在对控制器进行单元测试，则会有一个约定自动为您设置控制器。请参考您的测试中的controller，如下所示;

import grails.plugin.spock.* 

class EventControllerSpec extends ControllerSpec { 

    def "Creating a breadcrumb from an event"() { 
    given: "I have a named event" 
    def event = Mock(Event) 
    event.title >> 'Space-Journey with Sprock and the Crew' 

    when: "I create a breadcrumb from it" 
    def eventCrumb = controller.createCrumb("Event", "show", "1", event.title) 

    /* 
    private Map createCrumb (String controllerName, String actionName, String id, String msg) { 
    msg = (msg ? msg : "cr.breadcrumb.${controllerName}.${actionName}") 
    [ 'controller':controllerName, 
    'action':actionName, 
    'id':id, 
    'message':msg 
    ] 
    */ 

    then: "I receive a map where the message-value is the events' title" 
    eventCrumb.message == event.title 
    } 
} 

你并不需要明确地嘲笑控制器ControllerSpec它给你，但是，你可能需要模拟你的控制器使用的其他元素。有时候通过控制器的元类添加这些就足够了