Use own Pen (if set) in GeometryDrawing.GetBounds : Add unit tests

tests/Avalonia.RenderTests/Media/GeometryDrawingTests.cs

@@ -0,0 +1,52 @@
+using Avalonia.Media;
+using Xunit;
+
+#if AVALONIA_SKIA
+namespace Avalonia.Skia.RenderTests
+#else
+
+using Avalonia.Direct2D1.RenderTests;
+
+namespace Avalonia.Direct2D1.RenderTests.Media
+#endif
+{
+    public class GeometryDrawingTests : TestBase
+    {
+        public GeometryDrawingTests()
+            : base(@"Media\GeometryDrawing")
+        {
+        }
+
+        private GeometryDrawing CreateGeometryDrawing()
+        {
+            GeometryDrawing geometryDrawing = new GeometryDrawing();
+            EllipseGeometry ellipse = new EllipseGeometry();
+            ellipse.RadiusX = 100;
+            ellipse.RadiusY = 100;
+            geometryDrawing.Geometry = ellipse;
+            return geometryDrawing;
+        }
+
+        [Fact]
+        public void DrawingGeometry_WithPen()
+        {
+            GeometryDrawing geometryDrawing = CreateGeometryDrawing();
+            geometryDrawing.Pen = new Pen(new SolidColorBrush(Color.FromArgb(255, 0, 0, 0)), 10);
+
+            Assert.Equal(210, geometryDrawing.GetBounds().Height);
+            Assert.Equal(210, geometryDrawing.GetBounds().Width);
+
+        }
+
+        [Fact]
+        public void DrawingGeometry_WithoutPen()
+        {
+            GeometryDrawing geometryDrawing = CreateGeometryDrawing();
+
+            Assert.Equal(200, geometryDrawing.GetBounds().Height);
+            Assert.Equal(200, geometryDrawing.GetBounds().Width);
+        }
+
+
+    }
+}