test: add static a11y test.

tests/HeadlessTest.Ursa/Controls/FormTests/AccessibilityTests/FormAccessibilityTests.cs

@@ -0,0 +1,27 @@
+using Avalonia.Controls;
+using Avalonia.Headless;
+using Avalonia.Headless.XUnit;
+using Avalonia.Input;
+
+namespace HeadlessTest.Ursa.Controls.FormTests.AccessibilityTests;
+
+public class FormAccessibilityTests
+{
+    [AvaloniaFact]
+    public void Form_Inner_Control_Accessible()
+    {
+        var window = new Window();
+        var form = new StaticForm();
+        window.Content = form;
+        window.Show();
+
+        Assert.False(form.NameBox.IsFocused);
+        Assert.False(form.EmailBox.IsFocused);
+        window.KeyPressQwerty(PhysicalKey.N, RawInputModifiers.Alt);
+        Assert.True(form.NameBox.IsFocused);
+        Assert.False(form.EmailBox.IsFocused);
+        window.KeyPressQwerty(PhysicalKey.E, RawInputModifiers.Alt);
+        Assert.False(form.NameBox.IsFocused);
+        Assert.True(form.EmailBox.IsFocused);
+    }
+}

tests/HeadlessTest.Ursa/Controls/FormTests/AccessibilityTests/StaticForm.axaml

@@ -0,0 +1,13 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:u="https://irihi.tech/ursa"
+             mc:Ignorable="d" d:DesignWidth="800"
+             d:DesignHeight="450"
+             x:Class="HeadlessTest.Ursa.Controls.FormTests.AccessibilityTests.StaticForm">
+    <u:Form>
+        <TextBox Name="NameBox" Width="300" u:FormItem.Label="_Name" />
+        <TextBox Name="EmailBox" Width="300" u:FormItem.Label="_Email" />
+    </u:Form>
+</UserControl>

tests/HeadlessTest.Ursa/Controls/FormTests/AccessibilityTests/StaticForm.axaml.cs

@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace HeadlessTest.Ursa.Controls.FormTests.AccessibilityTests;
+
+public partial class StaticForm : UserControl
+{
+    public StaticForm()
+    {
+        InitializeComponent();
+    }
+}

tests/HeadlessTest.Ursa/HeadlessTest.Ursa.csproj

@@ -4,7 +4,6 @@
         <TargetFramework>net8.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
-
         <IsPackable>false</IsPackable>
         <IsTestProject>true</IsTestProject>
     </PropertyGroup>