# Test Case: DEFLATE Compression Level 6

**Test ID**: TC103-deflate-level6  

**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 DEFLATE compressed data path with level 6 (default) compression.

## Preconditions
- EROFS image created with DEFLATE level 6: `mkfs.erofs -zdeflate,level=6 test.img src/`
- Test files with various entropy levels
- FreeBSD 13.0+ with zlib support

## Test Steps
1. Create image with DEFLATE level 6 compression
2. Attach and mount: `unit=$(mdconfig -a -t vnode -f test.img); mount -t erofs -o ro /dev/${unit} /mnt`
3. Read text files, binaries, and random data
4. Verify all content matches original
5. Test partial reads at various offsets

## Expected Results
- All files decompress correctly
- Better compression ratio than level 1
- Random access works at any offset
- Stable decompression performance

## Verification Method
- SHA256 checksums match for all files
- Compression ratio >= level 1
- No decompression failures
- Random read correctness verified

## Cleanup
```sh
umount /mnt
mdconfig -d -u "${unit}"
```

## Notes
Tests feature 58: DEFLATE compressed data path with balanced compression.