feat: add UT for GeometryTypeConverter.

src/Avalonia.Base/Media/Geometry.cs

@@ -8,7 +8,7 @@ namespace Avalonia.Media
     /// <summary>
     /// Defines a geometric shape.
     /// </summary>
-    [TypeConverter(typeof(GeometryConverter))]
+    [TypeConverter(typeof(GeometryTypeConverter))]
     public abstract class Geometry : AvaloniaObject
     {
         /// <summary>
@@ -203,7 +203,7 @@ namespace Avalonia.Media
         }
     }
 
-    public class GeometryConverter : TypeConverter
+    public class GeometryTypeConverter : TypeConverter
     {
         public override bool CanConvertFrom(ITypeDescriptorContext? context, Type sourceType)
         {

tests/Avalonia.Markup.Xaml.UnitTests/Converters/GeometryTypeConverterTests.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Avalonia.Controls;
+using Avalonia.Controls.Shapes;
+using Avalonia.Media;
+using Avalonia.UnitTests;
+using Xunit;
+
+namespace Avalonia.Markup.Xaml.UnitTests.Converters
+{
+    public class GeometryTypeConverterTests: XamlTestBase
+    {
+        public class StringDataViewModel
+        {
+            public string PathData { get; set; } 
+        }
+
+        public class IntDataViewModel
+        {
+            public int PathData { get; set; }
+        }
+
+
+        [Theory]
+        [MemberData(nameof(Get_GeometryTypeConverter_Data))]
+        public void GeometryTypeConverter_Value_Work(object vm, bool nullData)
+        {
+            using(UnitTestApplication.Start(TestServices.StyledWindow))
+            {
+                var xaml = @"
+<Window xmlns='https://github.com/avaloniaui'
+        xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
+        xmlns:c='clr-namespace:Avalonia.Markup.Xaml.UnitTests.Converters;assembly=Avalonia.Markup.Xaml.UnitTests'>
+    <Path Name='path' Data='{Binding PathData}' Height='10' Width='10'/>
+</Window>";
+                var window = (Window)AvaloniaRuntimeXamlLoader.Load(xaml);
+                var path = window.FindControl<Path>("path");
+                window.DataContext = vm;
+                Assert.Equal(nullData, path.Data is null);
+            }
+        }
+
+        public static IEnumerable<object[]> Get_GeometryTypeConverter_Data()
+        {
+            yield return new object[] { new StringDataViewModel { }, true };
+            yield return new object[] { new StringDataViewModel { PathData = "M406.39,333.45l205.93,0" }, false };
+            yield return new object[] { new IntDataViewModel { }, true };
+            yield return new object[] { new IntDataViewModel { PathData = 100 }, true };
+        }
+    }
+}