核心数据迁移的自动化测试

Posted 2023-03-04

【中文标题】核心数据迁移的自动化测试

【英文标题】：Automated tests for Core Data Migration

【发布时间】：2015-12-11 19:21:32

【问题描述】：

我想为我的 Core Data 模型迁移创建自动化测试。我有模型的三个版本 - 1.0、1.1 和 1.2。我想在每次测试时创建一个新数据库，用假数据填充它，然后将其迁移到更新的版本，并在此过程中测试任何错误。我应该如何编写这样的测试？

【参考方案1】：

我已经通过从mom 而不是momd 文件加载模型来解决这个问题。示例测试如下所示：

func testMigarationFrom_1_0_To_1_1() 
    let modelUrl = NSBundle.mainBundle().URLForResource("1.0", withExtension: "mom", subdirectory: "Model.momd")!
    let model = NSManagedObjectModel(contentsOfURL: modelUrl)!
    let coordinator = NSPersistentStoreCoordinator(managedObjectModel: model)
    let databaseUrl = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent("Storage").URLByAppendingPathExtension("sqlite")
    try! coordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: databaseUrl, options: [NSMigratePersistentStoresAutomaticallyOption: true, NSInferMappingModelAutomaticallyOption: true])

    let context = NSManagedObjectContext(concurrencyType: .MainQueueConcurrencyType)
    context.persistentStoreCoordinator = coordinator

    for i in 0..<10 
        let entity = NSEntityDescription.insertNewObjectForEntityForName("entity", inManagedObjectContext: context) as! Entity
        entity.name = "test-\(i)"
    

    let newModelUrl = NSBundle.mainBundle().URLForResource("1.1", withExtension: "mom", subdirectory: "Model.momd")!
    let newModel = NSManagedObjectModel(contentsOfURL: newModelUrl)!
    let newCoordinator = NSPersistentStoreCoordinator(managedObjectModel: newModel)

    do 
        try newCoordinator.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: databaseUrl, options: [NSMigratePersistentStoresAutomaticallyOption: true, NSInferMappingModelAutomaticallyOption: true])
     catch let error 
        XCTFail("Should migrate without error, got \(error)")