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tests/TC068-shared-xattr-scan-notfound.md

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+# Test Case: Shared xattr scan not found
+
+**Test ID**: TC068-shared-xattr-scan-notfound
+**Fixture**: `basic.erofs`, `/shared-a`
+
+## Objective
+
+Verify clean exhaustion of inline and shared scans and namespace isolation.
+
+## Manual steps
+
+Mount `basic.erofs`, list the user namespace, then capture both misses:
+
+```sh
+lsextattr user /mnt/repo22-g4/shared-a
+truss -o /tmp/tc068-name.truss \
+  getextattr -qq user nonexistent /mnt/repo22-g4/shared-a
+truss -o /tmp/tc068-ns.truss \
+  getextattr -qq system shared_key /mnt/repo22-g4/shared-a
+grep extattr_get_file /tmp/tc068-*.truss
+```
+
+## Expected results
+
+Both kernel calls return `ENOATTR` (87), with no `EINTEGRITY`, delay, or name
+leak into the FreeBSD `system` namespace. Unmount and detach the image.