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tests/TC104-deflate-level9.md

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+# Test Case: DEFLATE Compression Level 9
+
+**Test ID**: TC104-deflate-level9  
+
+**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 9 (maximum) compression.
+
+## Preconditions
+- EROFS image created with DEFLATE level 9: `mkfs.erofs -zdeflate,level=9 test.img src/`
+- Large test files (1MB+) for compression testing
+- FreeBSD 13.0+ with zlib support
+
+## Test Steps
+1. Create image with DEFLATE level 9 compression
+2. Attach and mount: `unit=$(mdconfig -a -t vnode -f test.img); mount -t erofs -o ro /dev/${unit} /mnt`
+3. Read large compressed files sequentially
+4. Test random access throughout file
+5. Measure decompression performance
+
+## Expected Results
+- All files decompress correctly
+- Best compression ratio among DEFLATE levels
+- Slightly slower decompression acceptable
+- No data corruption
+
+## Verification Method
+- Verify checksums match original files
+- Compression ratio > level 6
+- Decompression throughput > 50 MB/s
+- Random access correctness validated
+
+## Cleanup
+```sh
+umount /mnt
+mdconfig -d -u "${unit}"
+```
+
+## Notes
+Tests feature 58: DEFLATE compressed data path with maximum compression.