Link console capture race fix to issue #4808

changelog.d/unreleased/4800-4808.fixed.md

@@ -0,0 +1,17 @@
+---
+category: fixed
+issues:
+  - 4800
+  - 4808
+affected:
+  - tests/CodeIndex.Tests/ConsoleCaptureTests.cs
+  - TESTING_GUIDE.md
+---
+
+## English
+
+- **Console capture restoration assertions no longer race parallel tests (#4800, #4808)** — the timeout regression test now snapshots and verifies `Console.Out` and `Console.Error` while holding the shared console ownership gate, preventing another test from replacing a writer during the assertion.
+
+## 日本語
+
+- **console capture の復元 assertion が並列テストと競合しなくなりました (#4800, #4808)** — timeout 回帰テストは共有 console ownership gate を保持した状態で `Console.Out` と `Console.Error` の snapshot 取得と検証を行うため、assertion 中に別のテストが writer を差し替える競合を防止します。

tests/CodeIndex.Tests/ConsoleCaptureTests.cs

@@ -193,7 +193,7 @@ await ConsoleCapture.CaptureAsync(
     }
 
     [Fact]
-    public async Task CaptureAsync_TimeoutRestoresOnlyAfterCallbackObservesCancellation_Issue4749()
+    public async Task CaptureAsync_TimeoutRestoresOnlyAfterCallbackObservesCancellation_Issues4749And4808()
     {
         TextWriter originalOut;
         TextWriter originalError;