test code v1

tests/TC073-metabox-container.md

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+# Test Case: Plain metabox container
+
+**Test ID**: TC073-metabox-container
+**Fixture**: `metabox-plain.erofs`, `/metabox-a`, `/metabox-b`
+
+## Objective
+
+Verify metadata and xattrs read from a plain regular metabox carrier. Before
+guest use, require manifest fields `METABOX`, `sb_extslots=1`, relocated
+`meta_blkaddr`, `metabox_nid`, bit-63 dirent NIDs, and image/source hashes.
+
+## Manual steps
+
+```sh
+unit=$(mdconfig -a -t vnode -f /tmp/repo22-g4/images/metabox-plain.erofs)
+mount -t erofs -o ro /dev/${unit} /mnt/repo22-g4
+stat -f 'mode=%Sp size=%z inode=%i' /mnt/repo22-g4/metabox-a \
+  /mnt/repo22-g4/metabox-b
+sha256 -q /mnt/repo22-g4/metabox-a /mnt/repo22-g4/metabox-b
+lsextattr user /mnt/repo22-g4/metabox-a
+getextattr -qq -x user metaboxshared /mnt/repo22-g4/metabox-a
+getextattr -qq -x user metaboxshared /mnt/repo22-g4/metabox-b
+umount /mnt/repo22-g4
+mdconfig -d -u "${unit#md}"
+```
+
+## Expected results
+
+The inode numbers retain bit 63; file hashes match the generated source;
+`metaboxshared` is `nonzero-base` for both files. No mount/md remains.