Test Case: MicroLZMA Compression

Test ID: TC109-microlzma

G5 fixture contract: Use 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

Create image with MicroLZMA-compressed small files
Attach and mount: unit=$(mdconfig -a -t vnode -f test.img); mount -t erofs -o ro /dev/${unit} /mnt
Read all small files
Verify content integrity
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

umount /mnt
mdconfig -d -u "${unit#md}"

Notes

Tests feature 60: MicroLZMA variant of LZMA compression.

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