feat: remove Template when Dot=True, add Badge Tests, format Badge class.

tests/HeadlessTest.Ursa/Controls/BadgeTests/BadgeTests.cs

@@ -0,0 +1,79 @@
+using Avalonia.Controls;
+using Avalonia.Controls.Presenters;
+using Avalonia.Controls.Templates;
+using Avalonia.Headless.XUnit;
+using UrsaControls = Ursa.Controls;
+
+namespace HeadlessTest.Ursa.Controls.BadgeTests;
+
+public class BadgeTests
+{
+    [AvaloniaFact]
+    public void Badge_Container_Should_DisAppear_If_Header_Is_Null_And_Dot_Equals_False()
+    {
+        // Arrange
+        var window = new Window();
+        var badge = new UrsaControls.Badge
+        {
+            Header = string.Empty,
+            Dot = true
+        };
+        window.Content = badge;
+        window.Show();
+
+        Assert.True(badge.IsVisible);
+
+        var badgeContainer = badge.GetTemplateChildren().OfType<Border>()
+            .FirstOrDefault(a => a.Name == UrsaControls.Badge.PART_BadgeContainer);
+
+        Assert.NotNull(badgeContainer);
+
+        Assert.True(badgeContainer.IsVisible);
+
+        // Act
+        badge.Header = null;
+        // Assert
+        Assert.True(badgeContainer.IsVisible);
+
+        // Act
+        badge.Dot = false;
+        // Assert
+        Assert.False(badgeContainer.IsVisible);
+    }
+
+    [AvaloniaFact]
+    public void Badge_Container_Should_Overflow_If_Number_Larger_Than_OverflowCount()
+    {
+        // Arrange
+        var window = new Window();
+        var badge = new UrsaControls.Badge
+        {
+            Header = 0,
+            OverflowCount = 10
+        };
+        window.Content = badge;
+        window.Show();
+
+        Assert.True(badge.IsVisible);
+
+        var header = badge.GetTemplateChildren().OfType<ContentPresenter>()
+            .FirstOrDefault(a => a.Name == UrsaControls.Badge.PART_HeaderPresenter);
+
+        Assert.NotNull(header);
+        Assert.Equal(header.Content, 0);
+
+        // Act
+        badge.Header = 10;
+
+        // Assert
+        Assert.Equal(header.Content, 10);
+
+        // Act
+        badge.Header = 11;
+        Assert.Equal(header.Content, "10+");
+
+        // Act
+        badge.OverflowCount = 100;
+        Assert.Equal(header.Content, 11);
+    }
+}