uschindler commented on code in PR #14627:
URL: https://github.com/apache/lucene/pull/14627#discussion_r2079517705


##########
lucene/test-framework/src/java/org/apache/lucene/tests/mockfile/WindowsFS.java:
##########
@@ -58,7 +58,13 @@ private Object getKey(Path existing) throws IOException {
     BasicFileAttributeView view =
         Files.getFileAttributeView(existing, BasicFileAttributeView.class);
     BasicFileAttributes attributes = view.readAttributes();
-    return attributes.fileKey();
+    Object key = attributes.fileKey();
+    if (key != null) {
+      return key;
+    }
+    // the key may be null, e.g. on real Windows!
+    // in that case we fallback to the real path
+    return existing.toRealPath();

Review Comment:
   @rmuir : You added thumbs up. Should I remove the realPath or levae it in? I 
feel better with realPath, but t may slowdown even more.



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