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tests/TC140-compressed-metabox-carrier.md

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+# Test Case: Compressed metabox carrier
+
+**Test ID**: TC140-compressed-metabox-carrier
+**Fixtures**: `metabox-compressed.erofs`, `metabox-fragment.erofs`, four `bad-*` fragment images
+
+## Objective
+
+Verify metadata/xattr reads from compressed and fragment-backed compressed
+metabox carriers, then reject loop, range, and recursive carrier relations.
+Require manifest carrier layout, NIDs, packed size, fragment offset/range,
+relocated metadata block, transformed fields, and image/source hashes.
+
+## Positive steps
+
+Mount each positive image separately and run:
+
+```sh
+stat -f 'mode=%Sp size=%z inode=%i' /mnt/repo22-g4/metabox-a
+sha256 -q /mnt/repo22-g4/metabox-a
+lsextattr user /mnt/repo22-g4/metabox-a
+getextattr -qq -x user metaboxshared /mnt/repo22-g4/metabox-a
+getextattr -qq -x user repo22.application.component.setting \
+  /mnt/repo22-g4/metabox-a
+getextattr -qq -x user shared-prefix-key /mnt/repo22-g4/metabox-a
+```
+
+## Negative steps
+
+Attach and trace-mount `bad-fragment-self-loop.erofs`,
+`bad-fragment-range.erofs`, `bad-metabox-recursive-nid.erofs`, and
+`bad-packed-recursive-nid.erofs` separately. Record `nmount`, dmesg,
+`vmstat -m | grep erofs`, responsiveness, and cleanup after each.
+
+## Expected results
+
+Both positives return source hash and exact values. All four negatives return
+`EINTEGRITY` (97), with active EROFS allocations, mounts, and md units at zero.