test code v1

tests/TC071-shared-security-xattr.md

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+# Test Case: Shared security xattr
+
+**Test ID**: TC071-shared-security-xattr
+**Fixture**: `basic.erofs`, `/security-shared-a`, `/security-shared-b`
+
+## Objective
+
+Verify a shared Linux `security.*` entry mapped to FreeBSD namespace `system`.
+The transformer must record `e_name_index: 1 -> 6`.
+
+## Manual steps
+
+```sh
+lsextattr system /mnt/repo22-g4/security-shared-a
+getextattr -qq -x system security.selinux /mnt/repo22-g4/security-shared-a
+getextattr -qq -x system security.selinux /mnt/repo22-g4/security-shared-b
+truss -o /tmp/tc071.truss getextattr -qq system security.missing \
+  /mnt/repo22-g4/security-shared-a
+grep extattr_get_file /tmp/tc071.truss
+```
+
+## Expected results
+
+Both values are exactly `system_u:object_r:shared_repo22_t:s0\0`; the missing
+name returns `ENOATTR` (87). Unmount and detach.