more tests

tests/Avalonia.Base.UnitTests/Logging/LoggingTests.cs

@@ -39,6 +39,34 @@ namespace Avalonia.Base.UnitTests.Logging
                 Assert.Equal(0, calledTimes);
             }
         }
+
+        [Fact]
+        public void Control_Should_Log_Binding_Errors_When_No_Ancestor_With_Such_Name()
+        {
+            using (UnitTestApplication.Start(TestServices.StyledWindow))
+            {
+                var xaml = @"
+<Window xmlns='https://github.com/avaloniaui'
+        xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
+        xmlns:local='clr-namespace:Avalonia.Base.UnitTests.Logging;assembly=Avalonia.UnitTests'>
+    <Panel>
+    <Rectangle Fill='{Binding $parent[Grid].Background}'/>
+  </Panel>
+</Window>";
+                var calledTimes = 0;
+                using var logSink = TestLogSink.Start((l, a, s, m, d) =>
+                {
+                    if (l >= Avalonia.Logging.LogEventLevel.Warning && s is Rectangle)
+                    {
+                        calledTimes++;
+                    }
+                });
+                var window = (Window)AvaloniaRuntimeXamlLoader.Load(xaml);
+                window.ApplyTemplate();
+                window.Presenter.ApplyTemplate();
+                Assert.Equal(1, calledTimes);
+            }
+        }
     }