[test-quarantine] Quarantine IIS RequestPathBaseTests flaky tests (HTTP 500 on startup)

[DeagleGross]

Quarantines two IIS path base tests that have been intermittently failing in the IISExpress.FunctionalTests pipeline:

Test	Failures (30 days)	Issue
IISExpress.FunctionalTests.RequestPathBaseTests.RequestPathBase_Split	6	#161
IISExpress.FunctionalTests.RequestPathBaseTests.RequestPathBase_WithDoubleSlashes_Split	6	#161

Both tests fail in the same builds with HTTP 500 instead of expected 200, suggesting an IISExpress startup race condition. The using Microsoft.AspNetCore.InternalTesting; statement was already present in the file.

Note: This source file (Common.FunctionalTests/RequestPathBaseTests.cs) compiles into multiple test assemblies. The failures are observed only in the IISExpress variant ([RequiresNewHandler] tests).

Associated issue: #161

Note

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Generated by Daily Test Quarantine Management · ◷

---

Note

This was originally intended as a pull request, but the git push operation failed.

Workflow Run: View run details and download patch artifact

The patch file is available in the agent artifact in the workflow run linked above.

To create a pull request with the changes:

# Download the artifact from the workflow run
gh run download 24028854426 -n agent -D /tmp/agent-24028854426

# Create a new branch
git checkout -b quarantine/2026-04-06-iis-request-pathbase-e93f76f0a7e74b99

# Apply the patch (--3way handles cross-repo patches where files may already exist)
git am --3way /tmp/agent-24028854426/aw-quarantine-2026-04-06-iis-request-pathbase.patch

# Push the branch to origin
git push origin quarantine/2026-04-06-iis-request-pathbase-e93f76f0a7e74b99

# Create the pull request
gh pr create --title '[test-quarantine] Quarantine IIS RequestPathBaseTests flaky tests (HTTP 500 on startup)' --base main --head quarantine/2026-04-06-iis-request-pathbase-e93f76f0a7e74b99 --repo DeagleGross/aspnetcore

Show patch preview (42 of 42 lines)

From 830afb556f3fcfc7305062f3cac7afbd7ec2cb63 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Mon, 6 Apr 2026 11:21:16 +0000
Subject: [PATCH] Quarantine RequestPathBaseTests.RequestPathBase_Split and
 RequestPathBase_WithDoubleSlashes_Split

Both tests have been flaky in the IISExpress.FunctionalTests pipeline,
failing with HTTP 500 instead of expected 200 (6 failures across 4 builds
in the past 30 days). The failures are consistent with an IISExpress
startup race condition.

Associated issue: https://github.com/DeagleGross/aspnetcore/issues/161

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 .../IIS/IIS/test/Common.FunctionalTests/RequestPathBaseTests.cs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Servers/IIS/IIS/test/Common.FunctionalTests/RequestPathBaseTests.cs b/src/Servers/IIS/IIS/test/Common.FunctionalTests/RequestPathBaseTests.cs
index fd4cd1d429..da50219623 100644
--- a/src/Servers/IIS/IIS/test/Common.FunctionalTests/RequestPathBaseTests.cs
+++ b/src/Servers/IIS/IIS/test/Common.FunctionalTests/RequestPathBaseTests.cs
@@ -32,6 +32,7 @@ public class RequestPathBaseTests : FixtureLoggedTest
 
     [ConditionalTheory]
     [RequiresNewHandler]
+    [QuarantinedTest("https://github.com/DeagleGross/aspnetcore/issues/161")]
     [InlineData("/Sub/App/PathAndPathBase", "/Sub/App/PathAndPathBase", "")]
     [InlineData("/SUb/APp/PathAndPAthBase", "/SUb/APp/PathAndPAthBase", "")]
     [InlineData(@"/Sub\App/PathAndPathBase/", @"/Sub\App/PathAndPathBase", "/")]
@@ -52,6 +53,7 @@ public class RequestPathBaseTests : FixtureLoggedTest
 
     [ConditionalTheory]
     [RequiresNewHandler]
+    [QuarantinedTest("https://github.com/DeagleGross/aspnetcore/issues/161")]
     [InlineData("//Sub/App/PathAndPathBase", "//Sub/App/PathAndPathBase", "")]
     [InlineData(@"/\Sub/App/PathAndPathBase/", @"/\Sub/App/PathAndPathBase", "/")]
     [InlineData(@"/Sub/\App/PathAndPathBase//pat
... (truncated)