如何在Grails集成测试中部分模拟服务

Question

I am attempting to write a test for a controller which calls a service method. I would like to mock a dependent method within that service.

My spec is as follows:

MyController myController = new MyController()
def mockMyService

def "My spy should be called"() {
    when:
        mockMyService = Spy(MyService) {
            methodToSpy() >> {
                println "methodToSpy called"
            } // stub out content of this fn
        }
        myController.myService = mockMyService
        myController.callService()

    then:
        1 * mockMyService.methodToSpy()
}

When I attempt to run this test, I get the following error:

Failure:  |
My spy should be called(spybug.MyControllerSpec)
 |
Too few invocations for:
1 * mockMyService.methodToSpy()   (0 invocations)
Unmatched invocations (ordered by similarity):
1 * mockMyService.serviceMethod()
1 * mockMyService.invokeMethod('methodToSpy', [])
1 * mockMyService.invokeMethod('println', ['in serviceMethod about to call methodToSpy'])
1 * mockMyService.invokeMethod('println', ['Back from methodToSpy'])

As you can see, Spock is capturing the Groovy invokeMethod call, not the subsequent call to the actual method. Why is this happening?

The complete project is available here .

Answer 1

Try this:

def "My spy should be called"() {
    given:
    mockMyService = Mock(MyService)
    myController.myService = mockMyService

    when:
    myController.callService()

    then:
    1 * mockMyService.methodToSpy(_) >> { println "methodToSpy called" }   
}

According to the spock documentation for stubs, if you want to use the cardinality, you must use a Mock and not a Stub.

http://spockframework.github.io/spock/docs/1.0/interaction_based_testing.html#_stubbing