Use xaml user control

tests/Avalonia.Xaml.Interactions.UnitTests/Core/ChangePropertyAction001.axaml

@@ -0,0 +1,17 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="Avalonia.Xaml.Interactions.UnitTests.Core.ChangePropertyAction001"
+        Title="ChangePropertyAction001">
+  <StackPanel>
+    <TextBox Name="TargetTextBox" Text="Initial Text" />
+    <Button Name="TargetButton">
+      <Interaction.Behaviors>
+        <EventTriggerBehavior EventName="Click">
+          <ChangePropertyAction TargetObject="TargetTextBox"
+                                PropertyName="Text"
+                                Value="Updated Text" />
+        </EventTriggerBehavior>
+      </Interaction.Behaviors>
+    </Button>
+  </StackPanel>
+</Window>

tests/Avalonia.Xaml.Interactions.UnitTests/Core/ChangePropertyAction001.axaml.cs

@@ -0,0 +1,11 @@
+using Avalonia.Controls;
+
+namespace Avalonia.Xaml.Interactions.UnitTests.Core;
+
+public partial class ChangePropertyAction001 : Window
+{
+    public ChangePropertyAction001()
+    {
+        InitializeComponent();
+    }
+}

tests/Avalonia.Xaml.Interactions.UnitTests/Core/ChangePropertyActionTests.cs

@@ -1,61 +1,23 @@
-using Avalonia.Controls;
-using Avalonia.Headless;
+using Avalonia.Headless;
 using Avalonia.Headless.XUnit;
 using Avalonia.Input;
-using Avalonia.Xaml.Interactions.Core;
-using Avalonia.Xaml.Interactivity;
 using Xunit;
 
 namespace Avalonia.Xaml.Interactions.UnitTests.Core;
 
 public class ChangePropertyActionTests
 {
     [AvaloniaFact]
-    public void Should_Update_Text_Property_On_Click_Event()
+    public void ChangePropertyAction_001()
     {
-        var textBox = new TextBox
-        {
-            Text = "Initial Text"
-        };
-
-        var button = new Button
-        {
-            [Interaction.BehaviorsProperty] = new BehaviorCollection 
-            {
-                new EventTriggerBehavior
-                {
-                    EventName = "Click",
-                    Actions =
-                    {
-                        new ChangePropertyAction 
-                        { 
-                            TargetObject = textBox,
-                            PropertyName = "Text",
-                            Value = "Updated Text"
-                        }
-                    }
-                }
-            }
-        };
-
-        var window = new Window
-        {
-            Content = new StackPanel
-            {
-                Children =
-                {
-                    textBox,
-                    button
-                }
-            }
-        };
+        var window = new ChangePropertyAction001();
 
         window.Show();
 
         // Click
-        button.Focus();
+        window.TargetButton.Focus();
         window.KeyPress(Key.Enter, RawInputModifiers.None);
 
-        Assert.Equal("Updated Text", textBox.Text);
+        Assert.Equal("Updated Text", window.TargetTextBox.Text);
     }
 }