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我目前正在对一个与 Core Data 交互的层进行单元测试。它保存、删除和更新Item对象。但是，我的测试试图保存一些Items 然后执行批量删除的测试一直失败。

这是Item：

extension Item {

    // MARK: - Properties

    @NSManaged public var date: NSDate

    @NSManaged public var isTaxable: Bool

    @NSManaged public var name: String

    @NSManaged public var price: NSDecimalNumber

    @NSManaged public var quantity: Double

    // MARK: - Fetch Requests

    @nonobjc public class func fetchRequest() -> NSFetchRequest<Item> { return NSFetchRequest<Item>(entityName: "Item") }

    // MARK: - Validation

    // Manual validation for `Decimal` values is needed. A radar is still open, which is …