LinkerTests.WarnWithReferenceToPreserveAttribute works

Author: grendello

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Tasks/LinkerTests.cs

@@ -802,9 +802,15 @@ void Assert64Bit(string rid, bool expected64)
 		}
 
 		[Test]
-		public void WarnWithReferenceToPreserveAttribute ()
+		public void WarnWithReferenceToPreserveAttribute ([Values] AndroidRuntime runtime)
 		{
-			var proj = new XamarinAndroidApplicationProject { IsRelease = true };
+			const bool isRelease = true;
+			if (IgnoreUnsupportedConfiguration (runtime, release: isRelease)) {
+				return;
+			}
+
+			var proj = new XamarinAndroidApplicationProject { IsRelease = isRelease };
+			proj.SetRuntime (runtime);
 			proj.AddReferences ("System.Net.Http");
 			proj.MainActivity = proj.DefaultMainActivity.Replace (
 				"protected override void OnCreate",