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tests/TC103-deflate-level6.md

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+# 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.