PRIVATE EVENT对象如何MOCK

Question

internal class DbRealTimeSyncController
    {
       
        /// <summary>
        /// </summary>
        private event SyncFinishedHandler SyncFinishedEvent;        /// <summary>
         /// </summary>
        private delegate void SyncFinishedHandler();        /// <summary>
        /// </summary>
        private void OnSyncFininshed()
        {
            SyncFinishedEvent();
        }
.......
现在想对OnSyncFininshed方法进行测试,但不知道SyncFinishedEvent事件怎么可以用TYPEMOCK可把把对象MOCK出来的.
如果是PUBLIC是可以的,现在是PRIVATE.请指教.