java - Spock stub 在功能方法中不起作用

Question

我正在使用 spock 编写单元测试。在创建测试用例时，我正在模拟对象并使用响应来 stub 函数调用。但是，当在主题类/服务类中执行 stub 调用时， stub 方法将返回 null 而不是实际值。如果我尝试访问测试类中的 stub 值，我可以访问它，但在 stub 类中，它为我的 stub 返回 null。

下面是我正在执行的示例

class Test extends Specification{
    def ServiceClass = new ServiceClass()
    def "test doSomething method"(){
        given:
        String id = "id"
        def cacheService = Mock(CacheService)
        def obj = Mock(CacheObj)
        cacheService.get(_) >> obj
        obj.getValue("thisID") >> "test"  //stubbing this to return test
        when:
        //calling dosomething() method of service class
        cacheService.doSomething(id)
        then:
        //checking assertions here
    }
}


class ServiceClass{
    public String doSomething(String id){
        Object obj = cacheService.get(id);
        String val = obj.getValue("thisID") // while executing this, val is returning **null**, but it should ideally return "test" as it is stubbed in specification class
    }
}

预期的响应是“test”，但它返回 null，这是我声明 stub 错误的地方吗？因为如果我在 setupSpec() 方法中声明这一点，一切都会按预期工作。

Answer 1

您应该以某种方式将模拟的 CacheService 传递到 ServiceClass 中。

测试的可能变体之一是:

class ServiceClassTest extends Specification {
    def "doSomething(String) should return a value of cached object"() {
        given: "some id"
        def id = "id"

        and: "mocked cached object which returns 'test' value"
        def obj = Mock(CacheObj)
        obj.getValue("thisID") >> "test"

        and: "mocked cached service which returns the cached object by given id"
        def cacheService = Mock(CacheService)
        cacheService.get(id) >> obj

        and: "a main service with injected the mocked cache service"
        def serviceClass = new ServiceClass(cacheService)

        expect:
        serviceClass.doSomething(id) == "test
    }
}

ServiceClass 有相应的构造函数来传递缓存服务:

class ServiceClass {
    private final CacheService cacheService;

    ServiceClass(CacheService cacheService) {
       this.cacheService = cacheService;
    }

    ...
}