【问题标题】:Spock stub not working in the feature methodSpock 存根在功能方法中不起作用
【发布时间】:2019-09-18 18:15:00
【问题描述】:

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对函数调用进行存根。但是当在主题类/服务类中执行存根调用时,存根方法返回 null 而不是实际值。如果我尝试访问测试类中的存根值,我可以访问它,但在存根类中它为我的存根返回 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,这是我声明存根错误的地方吗?因为如果我在 setupSpec() 方法中声明它,一切都会按预期工作。

【问题讨论】:

  • 如何将 mock 放入您的 ServiceClass?请修复代码以便编译。见MCVE
  • 我同意伦纳德的要求。其他问题是:您想如何在 Object 类型上调用 getValue()CacheService 类在哪里?还请完成测试,不要用 cmets 替换代码。这样没人能帮你。

标签: java unit-testing spock


【解决方案1】:

您应该以某种方式将模拟的CacheService 传递给ServiceClass

测试的一种可能变体是:

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有对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;
    }

    ...
}

【讨论】:

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