Swift cannot test core data in Xcode tests?

Question

I am working on a iOS project that uses core data. I am using swift. The Core Data stack is setup right and all seems to be fine. I have created a class for an entity (NSManage

Answer 1

The code example from Ludovic does not cover subentities. So when setting a parent entity in CoreData, the app crashes.

Adapted the code to take subentities into account:

private func createManagedObjectModel() {

    // Get module name
    var moduleName: String = "ModuleName"
    let environment = NSProcessInfo.processInfo().environment as! [String : AnyObject]
    let isTest = (environment["XCInjectBundle"] as? String)?.pathExtension == "xctest"
    if isTest { moduleName = "ModuleNameTests" }

    // Get model
    let modelURL = NSBundle.mainBundle().URLForResource(self.storeName, withExtension: "momd")!
    let model = NSManagedObjectModel(contentsOfURL: modelURL)!

    // Create entity copies
    var newEntities = [NSEntityDescription]()
    for (_, entity) in enumerate(model.entities) {
        let newEntity = entity.copy() as! NSEntityDescription
        newEntity.managedObjectClassName = "\(moduleName).\(entity.managedObjectClassName)"
        newEntities.append(newEntity)
    }

    // Set correct subentities
    for (_, entity) in enumerate(newEntities) {
        var newSubEntities = [NSEntityDescription]()
        for subEntity in entity.subentities! {
            for (_, entity) in enumerate(newEntities) {
                if subEntity.name == entity.name {
                    newSubEntities.append(entity)
                }
            }
        }
        entity.subentities = newSubEntities
    }

    // Set model
    self.managedObjectModel = NSManagedObjectModel()
    self.managedObjectModel.entities = newEntities
}