fixed test case

src/AuthenticationServices/PublicPrivateKeyAuthentication.cs

@@ -14,6 +14,7 @@
 using CoreGraphics;
 using Foundation;
 using ObjCRuntime;
+using System.Linq;
 
 #nullable enable
 
@@ -24,8 +25,29 @@ public static class PublicPrivateKeyAuthentication {
 		[DllImport (Constants.AuthenticationServicesLibrary)]
 		static extern /* NSString[] */ IntPtr ASAuthorizationAllSupportedPublicKeyCredentialDescriptorTransports ();
 
-		public static /* ASAuthorizationSecurityKeyPublicKeyCredentialDescriptorTransport[] */ NSString[] GetAllSupportedPublicKeyCredentialDescriptorTransports () {
-			return NSArray.ArrayFromHandle<NSString> (ASAuthorizationAllSupportedPublicKeyCredentialDescriptorTransports ());
+		public static ASAuthorizationSecurityKeyPublicKeyCredentialDescriptorTransport[]? GetAllSupportedPublicKeyCredentialDescriptorTransports () {
+			NSString[]? nsStringArray = NSArray.ArrayFromHandle<NSString> (ASAuthorizationAllSupportedPublicKeyCredentialDescriptorTransports ());
+
+			if (nsStringArray == null)
+				return null;
+
+			ASAuthorizationSecurityKeyPublicKeyCredentialDescriptorTransport[]? asArray = new ASAuthorizationSecurityKeyPublicKeyCredentialDescriptorTransport[nsStringArray.Count ()];
+			for (var i = 0; i < nsStringArray.Count (); i++) {
+				switch (nsStringArray[i].Description){
+					case "usb":
+						asArray[i] = ASAuthorizationSecurityKeyPublicKeyCredentialDescriptorTransport.Usb;
+						break;
+					case "nfc":
+						asArray[i] = ASAuthorizationSecurityKeyPublicKeyCredentialDescriptorTransport.Nfc;
+						break;
+					case "ble":
+						asArray[i] = ASAuthorizationSecurityKeyPublicKeyCredentialDescriptorTransport.Bluetooth;
+						break;
+					default:
+						break;
+				}
+			}
+			return asArray;
 		}
 	}
 }

src/authenticationservices.cs

@@ -1009,11 +1009,12 @@ enum ASCOSEAlgorithmIdentifier : long {
 		Es256 = -7,
 	}
 
-	[Mac (12,0), iOS (15,0), MacCatalyst (15,0), NoWatch, NoTV]
-	[Native]
-	enum ASCOSEEllipticCurveIdentifier : long {
-		P256 = 1,
-	}
+	// Introduced in Xcode13 Beta3 but not used anywhere
+	// [Mac (12,0), iOS (15,0), MacCatalyst (15,0), NoWatch, NoTV]
+	// [Native]
+	// enum ASCOSEEllipticCurveIdentifier : long {
+	// 	P256 = 1,
+	// }
 
 	interface IASAuthorizationPublicKeyCredentialAssertion { }
 

tests/monotouch-test/AuthenticationServices/PublicPrivateKeyAuthenticationTests.cs

@@ -27,7 +27,17 @@ public void Setup ()
 		[Test]
 		public void GetAllSupportedPublicKeyCredentialDescriptorTransports ()
 		{
+			var transports = PublicPrivateKeyAuthentication.GetAllSupportedPublicKeyCredentialDescriptorTransports ();
 			Assert.IsNotNull (PublicPrivateKeyAuthentication.GetAllSupportedPublicKeyCredentialDescriptorTransports (), "The transports should not be null");
+
+			// since there is no default enum value, make sure there is not
+			// more than one ASAuthorizationSecurityKeyPublicKeyCredentialDescriptorTransport.Usb
+			var usbCounter = 0;
+			foreach (var transport in transports) {
+				if (transport == ASAuthorizationSecurityKeyPublicKeyCredentialDescriptorTransport.Usb)
+					usbCounter++;
+			}
+			Assert.LessOrEqual (usbCounter, 1, "There were multiple usb transports found. Add any new transports to src/AuthenticationServices/PublicPrivateKeyAuthentication.cs");
 		}
 	}
 }

tests/xtro-sharpie/common-AuthenticationServices.ignore

@@ -1,3 +1,2 @@
 # xtro did not pick up on this enum
 !unknown-native-enum! ASCOSEAlgorithmIdentifier bound
-!unknown-native-enum! ASCOSEEllipticCurveIdentifier bound