From e89d5af718f4e6614ecafb8f16a82ffbf4a8c571 Mon Sep 17 00:00:00 2001
From: "Luis v.d.Eltz" <luisvde@outlook.de>
Date: Thu, 12 Dec 2019 10:29:28 +0100
Subject: [PATCH] Adding unit test

---
 .../MarkupExtensions/BindingExtensionTests.cs | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tests/Avalonia.Markup.Xaml.UnitTests/MarkupExtensions/BindingExtensionTests.cs b/tests/Avalonia.Markup.Xaml.UnitTests/MarkupExtensions/BindingExtensionTests.cs
index c3bc649abb..fa7e7ead28 100644
--- a/tests/Avalonia.Markup.Xaml.UnitTests/MarkupExtensions/BindingExtensionTests.cs
+++ b/tests/Avalonia.Markup.Xaml.UnitTests/MarkupExtensions/BindingExtensionTests.cs
@@ -38,6 +38,27 @@ namespace Avalonia.Markup.Xaml.UnitTests.MarkupExtensions
                 Assert.Equal("foobar", textBlock.Text);
             }
         }
+        
+        [Fact]
+        public void BindingExtension_Binds_To_TargetNullValue()
+        {
+            using (StyledWindow())
+            {
+                var xaml = @"
+<Window xmlns='https://github.com/avaloniaui'
+             xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'>
+    <TextBlock Name='textBlock' Text='{Binding Source={x:Null}, TargetNullValue='foobar'}'/>
+</Window>";
+
+                var loader = new AvaloniaXamlLoader();
+                var window = (Window)loader.Load(xaml);
+                var textBlock = window.FindControl<TextBlock>("textBlock");
+
+                window.Show();
+
+                Assert.Equal("foobar", textBlock.Text);
+            }
+        }
 
         private IDisposable StyledWindow(params (string, string)[] assets)
         {