test: add headless test.

tests/HeadlessTest.Ursa/Controls/FormTests/Dynamic_Item_Generation/Test.cs

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+using System.Collections.ObjectModel;
+using Avalonia.Controls;
+using Avalonia.Headless.XUnit;
+using Avalonia.LogicalTree;
+using Ursa.Controls;
+
+namespace HeadlessTest.Ursa.Controls.FormTests.Dynamic_Item_Generation;
+
+public class Test
+{
+    [AvaloniaFact]
+    public void FormItem_Generation()
+    {
+        // Arrange
+        var viewModel = new TestViewModel();
+        viewModel.Items = new ObservableCollection<IFormElement>
+        {
+            new FormTextViewModel { Label = "First Name" },
+            new FormTextViewModel { Label = "Last Name" },
+            new FormAgeViewModel { Label = "Age" },
+            new FormDateRangeViewModel { Label = "Date of Birth" }
+        };
+        var window = new TestWindow { DataContext = viewModel };
+
+        // Act
+        window.Show();
+
+        var form = window.FindControl<Form>("Form");
+        var logicalChildren = form.GetLogicalChildren().ToList();
+        Assert.True(logicalChildren.All(a=>a is FormItem));
+        Assert.IsType<TextBox>(logicalChildren[0].LogicalChildren[0]);
+        Assert.IsType<TextBox>(logicalChildren[1].LogicalChildren[0]);
+        Assert.IsType<NumericUIntUpDown>(logicalChildren[2].LogicalChildren[0]);
+        Assert.IsType<DateRangePicker>(logicalChildren[3].LogicalChildren[0]);
+        Assert.Equal("First Name", FormItem.GetLabel((Control)logicalChildren[0]));
+        Assert.Equal("Last Name", FormItem.GetLabel((Control)logicalChildren[1]));
+        Assert.Equal("Age", FormItem.GetLabel((Control)logicalChildren[2]));
+        Assert.Equal("Date of Birth", FormItem.GetLabel((Control)logicalChildren[3]));
+        
+        window.Close();
+    }
+    
+    [AvaloniaFact]
+    public void FormGroup_Generation()
+    {
+        // Arrange
+        var viewModel = new TestViewModel();
+        viewModel.Items = new ObservableCollection<IFormElement>
+        {
+            new FormGroupViewModel
+            {
+                Title = "Basic Information",
+                Items = new ObservableCollection<IFromItemViewModel>
+                {
+                    new FormTextViewModel { Label = "First Name" },
+                    new FormTextViewModel { Label = "Last Name" },
+                    new FormAgeViewModel { Label = "Age" },
+                    new FormDateRangeViewModel { Label = "Date of Birth" }
+                }
+            }
+        };
+        var window = new TestWindow { DataContext = viewModel };
+
+        // Act
+        window.Show();
+
+        var form = window.FindControl<Form>("Form");
+        var logicalChildren = form.GetLogicalChildren().ToList();
+        Assert.True(logicalChildren.All(a=>a is FormGroup));
+        var formGroup = (FormGroup)logicalChildren[0];
+        Assert.Equal("Basic Information", formGroup.Header);
+        var formItems = formGroup.GetLogicalChildren().ToList();
+        Assert.True(formItems.All(a=>a is FormItem));
+        Assert.IsType<TextBox>(formItems[0].LogicalChildren[0]);
+        Assert.IsType<TextBox>(formItems[1].LogicalChildren[0]);
+        Assert.IsType<NumericUIntUpDown>(formItems[2].LogicalChildren[0]);
+        Assert.IsType<DateRangePicker>(formItems[3].LogicalChildren[0]);
+        Assert.Equal("First Name", FormItem.GetLabel((Control)formItems[0]));
+        Assert.Equal("Last Name", FormItem.GetLabel((Control)formItems[1]));
+        Assert.Equal("Age", FormItem.GetLabel((Control)formItems[2]));
+        Assert.Equal("Date of Birth", FormItem.GetLabel((Control)formItems[3]));
+        
+        window.Close();
+    }
+    
+    [AvaloniaFact]
+    public void Mixture_Generation()
+    {
+        // Arrange
+        var viewModel = new TestViewModel();
+        viewModel.Items = new ObservableCollection<IFormElement>
+        {
+            new FormTextViewModel { Label = "First Name" },
+            new FormGroupViewModel
+            {
+                Title = "Basic Information",
+                Items = new ObservableCollection<IFromItemViewModel>
+                {
+                    new FormTextViewModel { Label = "Last Name" },
+                    new FormAgeViewModel { Label = "Age" },
+                    new FormDateRangeViewModel { Label = "Date of Birth" }
+                }
+            }
+        };
+        var window = new TestWindow { DataContext = viewModel };
+
+        // Act
+        window.Show();
+
+        var form = window.FindControl<Form>("Form");
+        var logicalChildren = form.GetLogicalChildren().ToList();
+        Assert.True(logicalChildren.All(a=>a is FormItem || a is FormGroup));
+        Assert.IsType<TextBox>(logicalChildren[0].LogicalChildren[0]);
+        var formGroup = (FormGroup)logicalChildren[1];
+        Assert.Equal("Basic Information", formGroup.Header);
+        var formItems = formGroup.GetLogicalChildren().ToList();
+        Assert.True(formItems.All(a=>a is FormItem));
+        Assert.IsType<TextBox>(formItems[0].LogicalChildren[0]);
+        Assert.IsType<NumericUIntUpDown>(formItems[1].LogicalChildren[0]);
+        Assert.IsType<DateRangePicker>(formItems[2].LogicalChildren[0]);
+        
+        window.Close();
+    }
+}