[tests] Add check for bluetooth permission (#6796)

tests/common/TestRuntime.cs

@@ -12,6 +12,7 @@
 
 #if XAMCORE_2_0
 using AVFoundation;
+using CoreBluetooth;
 using Foundation;
 #if !__TVOS__
 using Contacts;
@@ -654,6 +655,23 @@ public static bool IgnoreTestThatRequiresSystemPermissions ()
 		return !string.IsNullOrEmpty (Environment.GetEnvironmentVariable ("DISABLE_SYSTEM_PERMISSION_TESTS"));
 	}
 
+	public static void CheckBluetoothPermission (bool assert_granted = false)
+	{
+		// New in Xcode11
+		var centralManager = new CBCentralManager ();
+		switch (centralManager.Authorization) {
+		case CBManagerAuthorization.NotDetermined:
+			if (IgnoreTestThatRequiresSystemPermissions ())
+				NUnit.Framework.Assert.Ignore ("This test would show a dialog to ask for permission to use bluetooth.");
+			break;
+		case CBManagerAuthorization.Denied:
+		case CBManagerAuthorization.Restricted:
+			if (assert_granted)
+				NUnit.Framework.Assert.Fail ("This test requires permission to use bluetooth.");
+			break;
+		}
+	}
+
 #if !MONOMAC && !__TVOS__ && !__WATCHOS__
 	public static void RequestCameraPermission (NSString mediaTypeToken, bool assert_granted = false)
 	{

tests/monotouch-test/CoreBluetooth/CentralManagerTest.cs

@@ -81,6 +81,9 @@ public override void DisconnectedPeripheral (CBCentralManager central, CBPeriphe
 		[SetUp]
 		public void SetUp ()
 		{
+			// iOS 13 and friends require bluetooth permission
+			if (TestRuntime.CheckXcodeVersion (11, 0))
+			    TestRuntime.CheckBluetoothPermission ();
 			// Required API is available in macOS 10.8, but it doesn't work (hangs in 10.8-10.9, randomly crashes in 10.10) on the bots.
 			TestRuntime.AssertSystemVersion (PlatformName.MacOSX, 10, 11, throwIfOtherPlatform: false);
 			var e = new AutoResetEvent (false);