Swift 无法在 Xcode 测试中测试核心数据

Swift 无法在 Xcode 测试中测试核心数据？

import XCTest
import CoreData
@testable import MyApp
class MyCoreDataTests: XCTestCase {
    var managedObjectContext: NSManagedObjectContext!
    override func setUp() {
        super.setUp()
        // 初始化内存存储
        let managedObjectModel = NSManagedObjectModel.mergedModel(from: [Bundle.main])!
        let persistentStoreCoordinator = NSPersistentStoreCoordinator(managedObjectModel: managedObjectModel)
        try! persistentStoreCoordinator.addPersistentStore(ofType: NSInMemoryStoreType, configurationName: nil, at: nil, options: nil)
        // 创建管理对象上下文
        managedObjectContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
        managedObjectContext.persistentStoreCoordinator = persistentStoreCoordinator
    }
    override func tearDown() {
        super.tearDown()
        // 清除测试数据
        let fetchRequest: NSFetchRequest = NSFetchRequest(entityName: "MyEntity")
        let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
        try! managedObjectContext.execute(deleteRequest)
    }
    func testCoreData() {
        // 创建测试数据
        let entity = NSEntityDescription.entity(forEntityName: "MyEntity", in: managedObjectContext)!
        let myObject = NSManagedObject(entity: entity, insertInto: managedObjectContext)
        myObject.setValue("Test", forKey: "name")
        // 执行测试代码
        let fetchRequest: NSFetchRequest = MyEntity.fetchRequest()
        let results = try! managedObjectContext.fetch(fetchRequest)
        XCTAssertEqual(results.count, 1)
        XCTAssertEqual(results.first?.name, "Test")
    }
}