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+# Test Case: LZ4 ztailpacking Data Path
+
+**Test ID**: TC091-ztailpacking-basic  
+
+**G5 fixture contract**: Use [G5-MANUAL-SETUP.md](G5-MANUAL-SETUP.md).
+Its generated paths, source comparisons, structured corruption offsets, and
+cleanup rules supersede placeholder examples in this file.
+**Category**: Compression  
+**Priority**: High  
+**Regression**: None
+
+## Objective
+Verify correct operation of ztailpacking (compressed tail packing) for LZ4-compressed files.
+
+## Preconditions
+- EROFS image with ztailpacking enabled: `test-ztailpacking.erofs`
+- Test file: `/inline.dat` (64KB deterministic compressible data)
+- Mount point: `/mnt/test`
+- Generate with:
+  ```
+  mkfs.erofs -zlz4 -C4096 -Eztailpacking test-ztailpacking.erofs source
+  ```
+- Before mounting, require `dump.erofs -s` to report `ztailpacking` and
+  `dump.erofs --path=/inline.dat -e` to show the compressed physical extent
+  inside the metadata block. Enabling the mkfs option alone does not prove
+  that the target file was tail-packed.
+
+## Test Steps
+1. Mount the image:
+   ```
+   mount -t erofs /dev/md0 /mnt/test
+   ```
+
+2. Read file with packed tail:
+   ```
+   cat /mnt/test/inline.dat > /tmp/output.dat
+   ```
+
+3. Verify file size correct:
+   ```
+   stat -f %z /mnt/test/inline.dat
+   ```
+
+4. Read file tail specifically:
+   ```
+   tail -c 1024 /mnt/test/inline.dat > /tmp/tail.dat
+   ```
+
+5. Verify data integrity:
+   ```
+   sha256 /tmp/output.dat
+   ```
+
+## Expected Results
+- Step 2: File read successfully with tail decompressed
+- Step 3: Size matches original uncompressed size
+- Step 4: Tail data correct
+- Step 5: Checksum matches reference
+
+## Verification Method
+- Verify tail-packed data decompressed correctly
+- Confirm storage efficiency (tail stored inline or in special area)
+- Test tail packing transparent to reader
+- Verify boundary between main data and packed tail handled correctly
+
+## Cleanup
+```
+umount /mnt/test
+mdconfig -d -u md0
+rm /tmp/output.dat /tmp/tail.dat
+```
+
+## Notes
+- ztailpacking stores compressed file tail inline with inode or in special area
+- Reduces fragmentation and improves small file efficiency
+- Related tests: TC092 (edge cases), TC033 (uncompressed tailpacking)