test code v1

tests/TC109-microlzma.md

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+# Test Case: MicroLZMA Compression
+
+**Test ID**: TC109-microlzma  
+
+**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 MicroLZMA compressed data path works correctly.
+
+## Preconditions
+- `images/microlzma-edge.erofs`, generated with LZMA level 6
+- Actual 1-byte, 4096-byte, and 16384-byte source files
+- The 16384-byte inode must be compressed full-index with algorithm 1. The
+  smaller files are valid flat controls and must not be claimed as compressed.
+- FreeBSD 13.0+ with liblzma
+
+## Test Steps
+1. Create image with MicroLZMA-compressed small files
+2. Attach and mount: `unit=$(mdconfig -a -t vnode -f test.img); mount -t erofs -o ro /dev/${unit} /mnt`
+3. Read all small files
+4. Verify content integrity
+5. Test edge cases (1-byte, 16KB boundary)
+
+## Expected Results
+- All files read correctly and match their source bytes
+- MicroLZMA format handled properly
+- Good compression for small files
+- No format detection errors
+
+## Verification Method
+- Checksums match for all files
+- Verify LZMA format detection in dmesg
+- Test files at boundaries: 1B, 4KB, 16KB
+- No decompression failures
+
+## Cleanup
+```sh
+umount /mnt
+mdconfig -d -u "${unit#md}"
+```
+
+## Notes
+Tests feature 60: MicroLZMA variant of LZMA compression.