Grails – Spock不使用Groovy MetaClass更改为服务测试

在Spock单元测试中,我试图测试独立于get GithubUrlForPath的方法findRepositoriesByUsername的行为,两者都属于同一个服务.

重复尝试使用MetaClass失败：

> String.MetaClass.blarg产生错误没有这样的属性：blarg for class：java.lang.String
> service.MetaClass.getGithubUrlForPath修改服务实例不起作用
> Githubservice.MetaClass.getGithubUrlForPath修改服务类不起作用
>尝试在测试方法的设置中的MetaClass上添加/修改方法,以及何时块,都没有按预期工作

考试：

package grails.woot

import grails.test.mixin.TestFor

@TestFor(GithubservicE)
class GithubserviceSpec extends spock.lang.Specification {

    def 'MetaClass test'() {
        when:
        String.MetaClass.blarg = { -> 
            'brainf***'
        }

        then:
        'some String'.blarg == 'brainf***'
    }

    def 'can find repositories for the given username'() {
        given:
        def username = 'username'
        def requestPathParts

        when: 'the service is called to retrieve JSON'
        service.MetaClass.getGithubUrlForPath = { pathParts ->
            requestPathParts = pathParts
        }
        service.findRepositoriesByUsername(userName)

        then: 'the correct path parts are used'
        requestPathParts == ['users',username,'repos']
    }

}

服务：

package grails.woot

import grails.converters.JSON

class Githubservice {

    def apiHost = 'https://api.github.com/'

    def findRepositoriesByUsername(userName) {
        try{
            JSON.parse(getGithubUrlForPath('users','repos').text)
        } catch (FileNotFoundException eX) {
            // user not found
        }
    }

    def getGithubUrlForPath(String ... pathParts) {
        "${apiHost}${pathParts.join('/')}".toURL()
    }
}

我已经测试了groovy sHell中的String.MetaClass.blarg示例(由grails启动),它按预期方式执行.

我在这里有一个根本的误解吗？我究竟做错了什么？有没有更好的方法来处理所需的测试(替换测试服务上的方法)？

def 'MetaClass test'() {
    given:
        String.MetaClass.blarg = { -> 'brainf***' }

    expect:
        // note blarg is a method on String MetaClass 
        // not a field,invoke the method
        'some String'.blarg() == 'brainf***'
}

def 'can find repositories for the given username'() {
    given:
        def username = 'username'
        def requestPathParts

    when: 'the service is called to retrieve JSON'
        service.MetaClass.getGithubUrlForPath = { String... pathParts ->
            requestPathParts = pathParts
            [text: 'blah'] // mimicing URL class
        }
        service.findRepositoriesByUsername(userName)

    then: 'the correct path parts are used'
        requestPathParts == ['users','repos']
}