test code v1

tests/TC134-metabox-shared-nonzero-base.md

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+# Test Case: Metabox shared xattr with nonzero base
+
+**Test ID**: TC134-metabox-shared-nonzero-base
+**Fixture**: `metabox-plain.erofs`
+
+## Objective
+
+Verify that metabox shared IDs are relative to the nonzero
+`xattr_blkaddr << blkszbits`. Require manifest fields `xattr_blkaddr=1`,
+carrier xattr base 4096, shared record IDs/offsets, and bit-63 inode NIDs.
+
+## Manual steps
+
+```sh
+getextattr -qq -x user metaboxshared /mnt/repo22-g4/metabox-a
+getextattr -qq -x user metaboxshared /mnt/repo22-g4/metabox-b
+sha256 -q /mnt/repo22-g4/metabox-a /mnt/repo22-g4/metabox-b
+stat -f 'inode=%i size=%z' /mnt/repo22-g4/metabox-a \
+  /mnt/repo22-g4/metabox-b
+```
+
+## Expected results
+
+Both values are `nonzero-base`; data hashes match source and inode numbers
+retain bit 63. A read from logical offset `shared_id * 4` must not occur.
+Clean up.