add repeatbutton test

samples/IntegrationTestApp/MainWindow.axaml

@@ -34,7 +34,7 @@
         </StackPanel>
       </TabItem>
       
-      <TabItem Header="Button">
+      <TabItem Header="Button" Name="buttons">
         <StackPanel>
           <Button Name="DisabledButton" IsEnabled="False">
             Disabled Button
@@ -46,6 +46,9 @@
             <TextBlock>Button with TextBlock</TextBlock>
           </Button>
           <Button Name="ButtonWithAcceleratorKey" HotKey="Ctrl+B">Button with Accelerator Key</Button>
+          <RepeatButton Name="RepeatButton">
+            <TextBlock Name="RepeatButtonTextBlock" Text="Repeat Button: 0" />
+          </RepeatButton>
         </StackPanel>
       </TabItem>
 

samples/IntegrationTestApp/MainWindow.axaml.cs

@@ -10,16 +10,33 @@ namespace IntegrationTestApp
 {
     public class MainWindow : Window
     {
+        private int _repeatButtonClickCount = 0;
+        private bool _repeatButtonClickHandlerAdded = false;
         public MainWindow()
         {
             InitializeComponent();
             InitializeViewMenu();
             this.AttachDevTools();
             AddHandler(Button.ClickEvent, OnButtonClick);
+            var buttons = this.Find<TabItem>("buttons");
+            buttons!.GetObservable(TabItem.IsSelectedProperty).Subscribe(x =>
+            {
+                if (x == true && _repeatButtonClickHandlerAdded == false)
+                {
+                    this.Find<RepeatButton>("RepeatButton")!.Click += (a, e) =>
+                    {
+                        _repeatButtonClickCount++;
+                        var textBlock = this.FindControl<TextBlock>("RepeatButtonTextBlock");
+                        textBlock.Text = $"Repeat Button: {_repeatButtonClickCount}";
+                    };
+                    _repeatButtonClickHandlerAdded = true;
+                }
+            });
             ListBoxItems = Enumerable.Range(0, 100).Select(x => "Item " + x).ToList();
             DataContext = this;
         }
 
+
         public List<string> ListBoxItems { get; }
 
         private void InitializeComponent()

tests/Avalonia.IntegrationTests.Appium/ButtonTests.cs

@@ -36,6 +36,16 @@ namespace Avalonia.IntegrationTests.Appium
             Assert.True(button.Enabled);
         }
 
+        [Fact]
+        public void RepeatButton()
+        {
+            var button = _session.FindElementByAccessibilityId("RepeatButton");
+            button.Click();
+            Assert.Equal("Repeat Button: 1", button.Text);
+            button.Click();
+            Assert.Equal("Repeat Button: 2", button.Text);
+        }
+
         [Fact]
         public void ButtonWithTextBlock()
         {