From d46a847383eda6c6b50626488134657260e4fed1 Mon Sep 17 00:00:00 2001
From: Siegfried Pammer <siegfriedpammer@gmail.com>
Date: Fri, 1 May 2026 17:59:59 +0200
Subject: [PATCH] Regression-guard test for assembly tree pane visibility

Assisted-by: Claude:claude-opus-4-7:Claude Code

Assisted-by: Claude:claude-opus-4-7:Claude Code
---
 ILSpy.Tests/MainWindow/MainWindowTests.cs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/ILSpy.Tests/MainWindow/MainWindowTests.cs b/ILSpy.Tests/MainWindow/MainWindowTests.cs
index 01d04fdd4..27bff546e 100644
--- a/ILSpy.Tests/MainWindow/MainWindowTests.cs
+++ b/ILSpy.Tests/MainWindow/MainWindowTests.cs
@@ -16,11 +16,16 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
+using System.Linq;
+using System.Threading.Tasks;
+
 using Avalonia.Headless.NUnit;
+using Avalonia.VisualTree;
 
 using AwesomeAssertions;
 
 using ILSpy.AppEnv;
+using ILSpy.AssemblyTree;
 using ILSpy.ViewModels;
 using ILSpy.Views;
 
@@ -41,4 +46,18 @@ public class MainWindowTests
 		window.Title.Should().Be("ILSpy");
 		window.DataContext.Should().BeOfType<MainWindowViewModel>();
 	}
+
+	[AvaloniaTest]
+	public async Task Assembly_Tree_Pane_Is_Visible_In_Layout()
+	{
+		var window = AppComposition.Current.GetExport<MainWindow>();
+		window.Show();
+
+		await Waiters.WaitForAsync(() => window.GetVisualDescendants().OfType<AssemblyListPane>().Any());
+		var pane = window.GetVisualDescendants().OfType<AssemblyListPane>().Single();
+
+		pane.IsVisible.Should().BeTrue();
+		pane.Bounds.Width.Should().BeGreaterThan(0);
+		pane.Bounds.Height.Should().BeGreaterThan(0);
+	}
 }