# Test Case: Metabox-backed shared xattrs

**Test ID**: TC081-metabox-backed-xattr
**Fixture**: `metabox-plain.erofs`, `/metabox-a`, `/metabox-b`

## Objective

Verify shared entries, inline entries, and long-prefix shared entries from a
metabox logical stream. Require `SHARED_EA_IN_METABOX`, `xattr_blkaddr=1`,
carrier size/bounds, shared IDs, and prefix fields in the generator manifest.

## Manual steps

```sh
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
getextattr -qq -x user shared-prefix-key /mnt/repo22-g4/metabox-a
getextattr -qq -x user repo22.application.component.setting \
  /mnt/repo22-g4/metabox-a
```

## Expected results

Values are `nonzero-base`, `nonzero-base`, `shared-value`, and
`long-prefix-value`; all names list once. Clean up.