CoreDataTestCase.model is a single instance only created once per static scope
s.m4
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that's the static var
static var model: NSManagedObjectModel?
I check whether it's been created already and only initialize it if it hasn't
if let model = CoreDataTestCase.model {
mockPersistentContainer = NSPersistentContainer(name: "MySchema", managedObjectModel: model)
} else {
mockPersistentContainer = NSPersistentContainer(name: "MySchema")
CoreDataTestCase.model = mockPersistentContainer.managedObjectModel
}