feat: hide pipelines internals from stack trace

src/request.dispatcher.tests/StackTraceTests.cs

@@ -0,0 +1,73 @@
+// Copyright (c) The Geekeey Authors
+// SPDX-License-Identifier: EUPL-1.2
+
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Geekeey.Request.Dispatcher.Tests;
+
+internal sealed class StackTraceTests
+{
+	[Test]
+	public async Task I_can_not_see_pipeline_internals_are_hidden_from_stack_trace_scalar()
+	{
+		// Arrange
+		var sc = new ServiceCollection();
+		sc.AddSingleton<ScalarTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(FailingScalarHandler))
+			.Add(typeof(ScalarOpenBehavior<,>)));
+
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var request = new FailingScalarRequest();
+
+		// Act
+		var exception = await Assert.ThrowsAsync<InvalidOperationException>(() =>
+			dispatcher.DispatchAsync(request));
+
+		// Assert
+		await Assert.That(exception).IsNotNull();
+
+		var stackTrace = await Assert.That(exception.StackTrace).IsNotNull();
+
+		await Assert.That(stackTrace).Contains(nameof(FailingScalarHandler));
+		await Assert.That(stackTrace).Contains(nameof(ScalarOpenBehavior<,>));
+
+		// 3. Verify that the internal lambda from ScalarRequestInvoker.Chain is HIDDEN.
+		// In C#, these lambdas usually appear as "ScalarRequestInvoker`2.<>c__DisplayClass..." or similar.
+		// Since we added [StackTraceHidden], this frame should be omitted.
+		await Assert.That(stackTrace).DoesNotContain("ScalarRequestInvoker+<>");
+	}
+
+	[Test]
+	public async Task I_can_not_see_pipeline_internals_are_hidden_from_stack_trace_stream()
+	{
+		// Arrange
+		var sc = new ServiceCollection();
+		sc.AddSingleton<StreamTestTracker>();
+		sc.AddRequestDispatcher(builder => builder
+			.Add(typeof(FailingStreamHandler))
+			.Add(typeof(StreamOpenBehavior<,>)));
+
+		var provider = sc.BuildServiceProvider();
+		var dispatcher = provider.GetRequiredService<IRequestDispatcher>();
+		var request = new FailingStreamRequest();
+
+		// Act
+		var exception = await Assert.ThrowsAsync<InvalidOperationException>(() =>
+				dispatcher.DispatchAsync(request).ToListAsync().AsTask());
+
+		// Assert
+		await Assert.That(exception).IsNotNull();
+
+		var stackTrace = await Assert.That(exception.StackTrace).IsNotNull();
+
+		await Assert.That(stackTrace).Contains(nameof(FailingStreamHandler));
+		await Assert.That(stackTrace).Contains(nameof(StreamOpenBehavior<,>));
+
+		// 3. Verify that the internal lambda from ScalarRequestInvoker.Chain is HIDDEN.
+		// In C#, these lambdas usually appear as "ScalarRequestInvoker`2.<>c__DisplayClass..." or similar.
+		// Since we added [StackTraceHidden], this frame should be omitted.
+		await Assert.That(stackTrace).DoesNotContain("StreamRequestInvoker+<>");
+	}
+}