test: AutoCompleteBox tests.

tests/HeadlessTest.Ursa/Controls/AutoCompleteBoxTests/Tests.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Headless;
+using Avalonia.Headless.XUnit;
+using Avalonia.Input;
+using Avalonia.Layout;
+using UrsaControl = Ursa.Controls;
+
+namespace HeadlessTest.Ursa.Controls.AutoCompleteBoxTests;
+
+public class Tests
+{
+    [AvaloniaFact]
+    // Ideally Should not open popup when there is no items, but sub class have no access to this status. 
+    public void AutoCompleteBox_Focus_And_LostFocus()
+    {
+        var window = new Window();
+        var autoCompleteBox = new UrsaControl.AutoCompleteBox()
+        {
+            HorizontalAlignment = HorizontalAlignment.Left,
+            VerticalAlignment = VerticalAlignment.Top,
+            Width = 100,
+            Height = 100,
+        };
+        var textBox = new TextBox()
+        {
+            Width = 100, Height = 100,
+        };
+        window.Content = new StackPanel()
+        {
+            Children = { autoCompleteBox, textBox }
+        };
+        window.Show();
+        
+        Assert.False(autoCompleteBox.IsDropDownOpen);
+        autoCompleteBox.Focus();
+        Assert.True(autoCompleteBox.IsDropDownOpen);
+        textBox.Focus();
+        Assert.False(autoCompleteBox.IsDropDownOpen);
+    }
+    
+    [AvaloniaFact]
+    public void Click_AutoCompleteBox_With_Mouse_Should_Open_Dropdown()
+    {
+        var window = new Window();
+        var autoCompleteBox = new UrsaControl.AutoCompleteBox()
+        {
+            HorizontalAlignment = HorizontalAlignment.Left,
+            VerticalAlignment = VerticalAlignment.Top,
+            Width = 100,
+            Height = 100,
+            ItemsSource = new List<string> {"Hello", "World"}
+        };
+        window.Content = autoCompleteBox;
+        window.Show();
+        
+        Assert.False(autoCompleteBox.IsDropDownOpen);
+        window.MouseDown(new Point(10, 10), MouseButton.Left);
+        Assert.True(autoCompleteBox.IsDropDownOpen);
+    }
+    
+    [AvaloniaFact]
+    public void Click_AutoCompleteBox_With_Mouse_Should_NotOpen_Dropdown_When_Empty()
+    {
+        var window = new Window();
+        var autoCompleteBox = new UrsaControl.AutoCompleteBox()
+        {
+            HorizontalAlignment = HorizontalAlignment.Left,
+            VerticalAlignment = VerticalAlignment.Top,
+            Width = 100,
+            Height = 100,
+        };
+        window.Content = autoCompleteBox;
+        window.Show();
+        
+        Assert.False(autoCompleteBox.IsDropDownOpen);
+        window.MouseDown(new Point(10, 10), MouseButton.Left);
+        Assert.False(autoCompleteBox.IsDropDownOpen);
+    }
+    
+    [AvaloniaFact]
+    public void Right_Click_AutoCompleteBox_With_Mouse_Should_NotOpen_Dropdown()
+    {
+        var window = new Window();
+        var autoCompleteBox = new UrsaControl.AutoCompleteBox()
+        {
+            HorizontalAlignment = HorizontalAlignment.Left,
+            VerticalAlignment = VerticalAlignment.Top,
+            Width = 100,
+            Height = 100,
+            ItemsSource = new List<string> {"Hello", "World"},
+        };
+        window.Content = autoCompleteBox;
+        window.Show();
+        
+        Assert.False(autoCompleteBox.IsDropDownOpen);
+        window.MouseDown(new Point(10, 10), MouseButton.Right);
+        Assert.False(autoCompleteBox.IsDropDownOpen);
+    }
+}