     }
 }
 
-@available(iOS 13, tvOS 13, *)
 class DiffableDatasourceReferencesTestCase: XCTestCase {
     enum Section {
         case one

    
    func testHeaderViewShouldBeCreated()
    {
        controller.manager.registerHeader(NibHeaderFooterView.self)
        controller.manager.supplementaryStorage?.setSectionHeaderModels([1])
        setItems([1])

    
    override func setUp() {
        super.setUp()
        guard #available(iOS 13, tvOS 13, *) else { return }
        let _ = controller.view
        controller.manager.register(NibCell.self)
        diffableDataSource = controller.manager.configureDiffableDataSource(modelProvider: { $1 })
        controller.manager.register(NibCell.self)
    }
    
    func testMultipleSectionsWorkWithDiffableDataSources() {
        guard #available(iOS 13, tvOS 13, *) else { return }
        dataSource.apply(.snapshot(with: { snapshot in
            snapshot.appendSections([.one, .two])
            snapshot.appendItems([1,2], toSection: .one)
