Swift CloudKit单元测试查询未执行

我正在尝试为CloudKit编写一个测试，我正在重写我想要测试的方法，并扩展

CKDatabase

，以便模拟我的CloudKit数据库，这是我从其他帖子中可以确定的( -谢谢）这是测试CloudKit所必需的

我在测试和尝试学习方面缺乏经验，所以我觉得我可能遗漏了一些更大的东西，打印语句从未打印出来，表明从未执行过闭包。有人能给我指一下正确的方向吗

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这是我的简化代码-

CloudKitService.swift

protocol CKDatabaseProtocol {
    func perform(_ query: CKQuery, inZoneWith zoneID: CKRecordZone.ID?, completionHandler: @escaping ([CKRecord]?, Error?) -> Void)
}

extension CKDatabase: CKDatabaseProtocol { }

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class MockCloudKit: CKDatabaseProtocol {

    private let container: CKContainer

    fileprivate var database: CKDatabase {
        return self.container.publicCloudDatabase
    }

    init(container: CKContainer) {
        self.container = container
    }

    func perform(_ query: CKQuery, inZoneWith zoneID: CKRecordZone.ID?, completionHandler: @escaping ([CKRecord]?, Error?) -> Void) {
        self.database.perform(query, inZoneWith: zoneID, completionHandler: completionHandler)
    }

    func getData(dataFetched: @escaping([CKRecord]) -> (Void)) {    
        let predicate = NSPredicate(value: true)
        let publicQuery = CKQuery(recordType: "MyRecord", predicate: predicate)
        publicQuery.sortDescriptors = [NSSortDescriptor(key: "id", ascending: true)]

        perform(publicQuery, inZoneWith: .default) { results, error in
            dataFetched([CKRecord]())
            // no execution here
            print("This is never printed")
                ...
        }
    }
}

class CloudKitTest: XCTestCase {

    func myTest() {
        var record = [CKRecord]()
        let container = CKContainer.default()
        let mockContainer = MockCloudKit(container: container)

        mockContainer.getData( dataFetched: { results in
             // no execution here
             print("This is never printed")
             ....
        }
    }
}