currentBuild.changeSets测试

Question

我想为以下类似方法编写单元测试。我的主要问题是changeSets对象的结构。

Mockito.doReturn([changeSets:[item:[[author: 'author', msg: 'msg']]]])

如何在doReturn中准备正确的对象？实体必须具有长度，而不是上述的size（）。整个对象的className是什么？

@NonCPS
def getChangeString() {
    MAX_MSG_LEN = 10
    def changeString = ""

    echo "Gathering SCM changes"
    def changeLogSets = currentBuild.changeSets
    for (int i = 0; i < changeLogSets.size(); i++) {
        def entries = changeLogSets[i].items
        for (int j = 0; j < entries.length; j++) {
            def entry = entries[j]
            truncated_msg = entry.msg.take(MAX_MSG_LEN)
            changeString += " - ${truncated_msg} [${entry.author}]\n"
        }
    }

    if (!changeString) {
        changeString = " - No new changes"
    }
    return changeString
}

如何进入第二循环？