unit-testing - 为什么即使使用 Spocks 的 Mock() 模拟了底层 Controller ，此方法仍返回 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 EventController 中被注释掉的方法

为什么代码段会导致“ 无法在空对象 上获取属性 'message'”？

如何正确设置代码段？

一般来说，在使用 时，我是否需要任何 mockTagLib、mockController、mockLogging GrailsUnitTestCase 函数？斯波克 ?

Answer 1

如果您正在对 Controller 进行单元测试，则有一个约定可以自动为您设置 Controller 。只需引用 controller在您的测试中如下所示；

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
  }
}

您不需要将 Controller 显式模拟为 ControllerSpec为你做，但是，你可能需要模拟你的 Controller 正在使用的其他元素。有时通过 Controller 的元类添加这些就足够了