From 81255a9ac1f278f5cda17b4efe47386e9e144d78 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 9 Feb 2026 02:47:23 +0000
Subject: [PATCH] Improve test robustness with path validation and named
 constant

Co-authored-by: TingluoHuang <1750815+TingluoHuang@users.noreply.github.com>
---
 src/Test/L0/Listener/RunnerL0.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Test/L0/Listener/RunnerL0.cs b/src/Test/L0/Listener/RunnerL0.cs
index ed90b7d1f..a8f432a06 100644
--- a/src/Test/L0/Listener/RunnerL0.cs
+++ b/src/Test/L0/Listener/RunnerL0.cs
@@ -1107,8 +1107,12 @@ namespace GitHub.Runner.Common.Tests.Listener
 
                 // Place a file where the work directory should be - this blocks Directory.CreateDirectory
                 string parentPath = Path.GetDirectoryName(workPath);
+                Assert.NotNull(parentPath);
+                Assert.NotEmpty(parentPath);
                 Directory.CreateDirectory(parentPath);
-                File.WriteAllText(workPath, "blocking file content");
+
+                const string blockingFileContent = "test file blocking directory creation";
+                File.WriteAllText(workPath, blockingFileContent);
 
                 const int testPoolId = 12345;
                 const int testAgentId = 67890;