Hi, Im new to Bluetooth development in iOS, I have a simple app that connects to a bluetooth device and allows you to send commands via bluetooth. The app is working fine when I run the app or run UI tests however in my unit tests I'm getting this issue were the the bluetooth controller init() function who's responsibility is to assign a bluetooth central manager:  public override init() {         super.init()         myCentral = CBCentralManager(delegate: self, queue: nil)         myCentral.delegate = self         print("state: ")         print(myCentral.state)     } The 'centralManagerDidUpdateState(_ central: CBCentralManager)' callback should then be invoked but this is not getting called until the end of my tests which I can't understand why.     public func centralManagerDidUpdateState(_ central: CBCentralManager) {         if central.state == .poweredOn {             isSwitchedOn = true             print("Bluetooth powered on")         }         else {             isSwitchedOn = false             print("Bluetooth not powered on")         }     } and due to the long delay in assigning a central device when I try to run a command in my tests eg. connect I get the error from the title '[CoreBluetooth] API MISUSE: <CBCentralManager: 0x28156d480> can only accept this command while in the powered on state'. I know the central is assigned at the end of my tests because 'bluetooth powered on' is logged as the last thing in my tests. I've even tried modifying the tests by adding a call to connect at the very end of the tests or sleep time to see if it was just a time issue but the centralManager callback is still not invoked until all the test code is executed Thanks in advance for any help provided :)