test code v1

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+# Test Case: LZ4 Compression Configuration Handling
+
+**Test ID**: TC088-lz4-config-handling  
+
+**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**: Medium  
+**Regression**: None
+
+## Objective
+Verify correct handling of different LZ4 compression configurations.
+
+## Preconditions
+- Multiple EROFS images with different LZ4 configs:
+  - `lz4-pcluster-4k.erofs` (4KB pcluster)
+  - `lz4-pcluster-64k.erofs` (64KB pcluster)
+  - `lz4-pcluster-256k.erofs` (256KB pcluster)
+- Test file in each: `/files/test.dat` (identical content)
+- Mount points: `/mnt/test1`, `/mnt/test2`, `/mnt/test3`
+- Generate the images explicitly with `mkfs.erofs 1.8.6`:
+  ```
+  mkfs.erofs -zlz4 -C4096 lz4-pcluster-4k.erofs source
+  mkfs.erofs -zlz4 -C65536 lz4-pcluster-64k.erofs source
+  mkfs.erofs -zlz4 -C262144 lz4-pcluster-256k.erofs source
+  ```
+- Confirm the requested feature/configuration with `dump.erofs -s` before
+  treating an image as a valid fixture.
+
+## Test Steps
+1. Mount all three images:
+   ```
+   mount -t erofs /dev/md0 /mnt/test1
+   mount -t erofs /dev/md1 /mnt/test2
+   mount -t erofs /dev/md2 /mnt/test3
+   ```
+
+2. Read from each and verify identical output:
+   ```
+   sha256 /mnt/test1/files/test.dat
+   sha256 /mnt/test2/files/test.dat
+   sha256 /mnt/test3/files/test.dat
+   ```
+
+3. Record image sizes without assuming a monotonic compression ratio:
+   ```
+   stat -f %z /root/lz4-pcluster-4k.erofs
+   stat -f %z /root/lz4-pcluster-64k.erofs
+   stat -f %z /root/lz4-pcluster-256k.erofs
+   ```
+
+4. Verify the same offset read with each pcluster size. Timing is diagnostic
+   only and is not a functional pass criterion:
+   ```
+   time dd if=/mnt/test1/files/test.dat of=/dev/null bs=4K skip=100 count=10
+   time dd if=/mnt/test2/files/test.dat of=/dev/null bs=4K skip=100 count=10
+   time dd if=/mnt/test3/files/test.dat of=/dev/null bs=4K skip=100 count=10
+   ```
+
+## Expected Results
+- Step 1: All mounts succeed
+- Step 2: All three checksums identical (data integrity)
+- Step 3: Image sizes are recorded for the exact corpus and mkfs version
+- Step 4: All reads succeed and return identical data at the tested offset
+
+## Verification Method
+- Verify all pcluster configurations work correctly
+- Record pcluster size effects without assuming they are monotonic for every
+  corpus or under a QEMU TCG guest
+- Test driver handles different configs transparently
+
+## Cleanup
+```
+umount /mnt/test1 /mnt/test2 /mnt/test3
+mdconfig -d -u "${unit1#md}"
+mdconfig -d -u "${unit2#md}"
+mdconfig -d -u "${unit3#md}"
+```
+
+## Notes
+- Pcluster size is compression unit (physical cluster)
+- Larger pcluster -> better compression, worse random access
+- Typical sizes: 4KB, 16KB, 64KB, 256KB
+- Related tests: TC089 (pcluster mapping)