ILSpy/ILSpy.Tests/AssemblyList/UseNestedNamespaceNodesGridVerification.cs

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using System.Threading.Tasks;

using Avalonia.Controls;
using Avalonia.Headless.NUnit;

using AwesomeAssertions;

using ILSpy;
using ILSpy.AppEnv;
using ILSpy.AssemblyTree;
using ILSpy.TreeNodes;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests;

[TestFixture]
public class UseNestedNamespaceNodesGridVerification
{
	[AvaloniaTest]
	public async Task Toggling_UseNestedNamespaceNodes_Triggers_BindTree_So_The_Grid_Sees_The_New_Shape()
	{
		// The pane caches a snapshot of each expanded node's children via the
		// HierarchicalOptions.ChildrenSelector — mid-expand mutations to AssemblyTreeNode.
		// Children aren't observed by the live grid. The fix raises AssemblyTreeModel.Root
		// PropertyChanged so AssemblyListPane.BindTree fires and replaces the
		// HierarchicalModel; this test verifies that re-bind happens.

		var settings = AppComposition.Current.GetExport<SettingsService>().DisplaySettings;
		settings.UseNestedNamespaceNodes = false;

		var (window, vm) = await TestHarness.BootAsync(3);
		var pane = await window.WaitForComponent<AssemblyListPane>();
		var grid = pane.FindControl<DataGrid>("TreeGrid")!;

		// Expand an assembly to force the ChildrenSelector to fire and cache its snapshot.
		var assemblyNode = vm.AssemblyTreeModel.FindNode<AssemblyTreeNode>("System.Linq");
		assemblyNode.IsExpanded = true;
		await Waiters.WaitForAsync(() => grid.HierarchicalModel != null);

		try
		{
			var modelBefore = grid.HierarchicalModel;
			((object?)modelBefore).Should().NotBeNull("baseline: the grid must have a HierarchicalModel before the toggle");

			settings.UseNestedNamespaceNodes = true;

			await Waiters.WaitForAsync(
				() => !ReferenceEquals(grid.HierarchicalModel, modelBefore),
				System.TimeSpan.FromSeconds(5));

			grid.HierarchicalModel.Should().NotBeSameAs(modelBefore,
				"toggling UseNestedNamespaceNodes must force AssemblyListPane.BindTree, "
				+ "replacing the HierarchicalModel with one that reads the rebuilt children");
		}
		finally
		{
			settings.UseNestedNamespaceNodes = false;
		}
	}
}