DispatchQueue.main.async(qos: .utility) { }
  DispatchQueue.main.async(qos: .background) { }

@globalActor actor TestActor {
    static let shared = TestActor()

    @MainActor
    func performOnMainActor() async {
        Task(priority: .low) { @MainActor in
            print("first")
        }
        Task(priority: .high) { @MainActor in
            print("second")
        }
    }

    @TestActor
    func performOnTestActor() async {
        Task(priority: .low) { @TestActor in
            print("first")
        }
        Task(priority: .high) { @TestActor in
            print("second")
        }
    }
}