[Tests] Allow to ignore the CMattachment tests in certain namespaces. (#7286)

There are a number of namespaces that do not support the API and can be
completly skipped. Also some of the classes in those namspaces are
expensive to create and the test is not providing any useful
information.

Fixes: https://github.com/xamarin/maccore/issues/2038

tests/introspection/ApiCMAttachmentTest.cs

@@ -162,9 +162,18 @@ namespace Introspection {
 
 		protected virtual bool Skip (Type type)
 		{
-			return Skip (type.Name) || SkipDueToAttribute (type);
+			return SkipNameSpace (type.Namespace) || Skip (type.Name) || SkipDueToAttribute (type);
 		}
 
+		protected virtual bool SkipNameSpace (string nameSpace)
+		{
+			switch (nameSpace) {
+			case "Network": // none of the classes support it and they require a lot of setup to confirm it
+				return true;
+			default:
+				return false;
+			}
+		}
 		protected virtual bool Skip (string nativeName)
 		{
 			if (nativeName.Contains ("`")) {
@@ -229,26 +238,9 @@ namespace Introspection {
 			case "ABMutableMultiValue":
 			case "SecProtocolMetadata": // Read-only object that is surfaced during TLS negotiation callbacks, can not be created from user code.
 			case "SecProtocolOptions":  // Read-only object that is surfaced during TLS negotiation callbacks, can not be created from user code.
-			case "NWError":               // Only ever surfaced, not created from usercode
-			case "NWInterface":           // Only ever surfaced, not created from usercode
-			case "NWPath":                // Only ever surfaced, not created from usercode
-			case "NWProtocolStack":       // Only ever surfaced, not created from usercode
-			case "NWProtocolMetadata":    // While technically it can be created and the header files claim the methods exists, the library is missing the methods (radar: 42443077)
-			case "NWBrowseResult": // API to be consumed, create a new instance requires a network connection, which is not ideal for this tests. Aslo, the class does not support the API.
-			case "NWBrowser": // same as above
-			case "NWDataTransferReport": // same as above
-			case "NWEstablishmentReport": // same as above
-			case "NWFramer": // same as above
-			case "NWTxtRecord": // same as above
-			case "NWWebSocketMetadata": // same as above
-			case "NWWebSocketOptions": // same as above
-			case "NWWebSocketRequest": // same as above
-			case "NWWebSocketResponse": // same as above
-			case "NWProtocolIPOptions": // same as above
 			case "ABSource": // not skipped when running on iOS 6.1
 			// type was removed in iOS 10 (and replaced) and never consumed by other API
 			case "CGColorConverter":
-			case "NWBrowserDescriptor":
 				return true;
 			default:
  				return false;
@@ -448,26 +440,6 @@ namespace Introspection {
 					new CVPixelBufferPoolSettings (),
 					new CVPixelBufferAttributes (CVPixelFormatType.CV24RGB, 100, 50)
 				);
-			case "NWAdvertiseDescriptor":
-				return NWAdvertiseDescriptor.CreateBonjourService ("sampleName" + DateTime.Now, "_nfs._tcp");
-			case "NWConnection": {
-				var endpoint = NWEndpoint.Create ("www.microsoft.com", "https");
-				var parameters = NWParameters.CreateTcp (configureTcp: null);
-				return new NWConnection (endpoint, parameters);
-			}
-			case "NWContentContext":
-				return new NWContentContext ("contentContext" + DateTime.Now);
-			case "NWEndpoint":
-				return NWEndpoint.Create ("www.microsoft.com", "https");
-			case "NWListener":
-				return NWListener.Create (NWParameters.CreateTcp (configureTcp: null));
-			case "NWParameters":
-				return NWParameters.CreateTcp (configureTcp: null);
-			case "NWProtocolDefinition":
-				// Makes a new instance every time
-				return NWProtocolDefinition.TcpDefinition;
-			case "NWProtocolOptions":
-				return NWProtocolOptions.CreateTcp ();
 			case "SecCertificate":
 				using (var cdata = NSData.FromArray (mail_google_com))
 					return new SecCertificate (cdata);