ILSpy/ILSpy.Tests/Metadata/StandalonePdbTreeTests.cs

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using System.IO;
using System.Linq;
using System.Threading.Tasks;

using Avalonia.Headless.NUnit;

using AwesomeAssertions;

using ICSharpCode.ILSpy.Metadata;
using ICSharpCode.ILSpy.Metadata.DebugTables;
using ICSharpCode.ILSpy.TreeNodes;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests.Metadata;

[TestFixture]
public class StandalonePdbTreeTests
{
	[AvaloniaTest]
	public async Task Opening_A_Standalone_Portable_PDB_Surfaces_Its_Metadata_Tables_And_Heaps()
	{
		// A standalone .pdb (no companion assembly) loads as a metadata-only MetadataFile of
		// kind ProgramDebugDatabase. Its tree node must expand to the PDB's metadata tables and
		// heaps directly under the file node; before the fix the node had an expander but zero
		// children (the "empty tree" symptom).

		// The test SDK builds this assembly with a sidecar portable PDB, so use that PDB on its
		// own as the standalone fixture.
		var pdbPath = Path.ChangeExtension(typeof(StandalonePdbTreeTests).Assembly.Location, ".pdb");
		File.Exists(pdbPath).Should().BeTrue(
			$"the test assembly must ship a sidecar portable PDB to use as a standalone fixture (looked for '{pdbPath}')");

		var (_, vm) = await TestHarness.BootAsync();

		var loaded = await vm.OpenAssemblyAsync(pdbPath);
		TestCapture.Step("opened-standalone-pdb");

		var pdbNode = vm.AssemblyTreeModel.FindNode<AssemblyTreeNode>(loaded.ShortName);
		pdbNode.EnsureLazyChildren();
		TestCapture.Step("pdb-node-expanded");

		pdbNode.Children.Should().NotBeEmpty(
			"a standalone portable PDB must populate its tree node instead of rendering empty");

		var tables = pdbNode.GetChild<MetadataTablesTreeNode>();
		tables.EnsureLazyChildren();
		tables.Children.OfType<DocumentTableTreeNode>().Should().NotBeEmpty(
			"the standalone PDB's Tables subtree must expose the Document table — the lead debug-only table that always has rows in a populated PDB");

		// The heap nodes are also surfaced directly (string/userstring/guid/blob).
		pdbNode.Children.OfType<StringHeapTreeNode>().Should().ContainSingle();
		pdbNode.Children.OfType<BlobHeapTreeNode>().Should().ContainSingle();
	}
}