test code v1

tests/TC093-chunk-single-device.md

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+# Test Case: Indexed Chunk Data on the Primary Device
+
+**Test ID**: TC093-chunk-single-device  
+**Category**: Chunk-Based  
+**Priority**: High
+
+## Objective
+
+Verify 8-byte chunk indexes whose device ID is zero without a device table.
+This is not a 4-byte block-map substitute.
+
+## Fixture
+
+Use `single-indexed.erofs` from the fresh G6 generator.  It is derived from the
+mkfs blob baseline by asserting each original `(high=0, device=1, pblk)`,
+folding the new blob bytes behind the metadata block, changing every index to
+`device=0`, adding one to each pblk, and removing the device-table feature.
+`verify` must report `extra_devices=0` and `entry_size=8`.
+
+## Manual procedure
+
+```sh
+I=/root/repo22-g6/images
+S=/root/repo22-g6/sources/chunk
+mkdir -p /mnt/g6
+kldload /root/repo22-g6/erofs.ko
+mdconfig -a -t vnode -f "$I/single-indexed.erofs" -u 90
+mount -t erofs -o ro /dev/md90 /mnt/g6
+sha256 "$S/indexed.bin" /mnt/g6/indexed.bin
+cmp "$S/indexed.bin" /mnt/g6/indexed.bin
+dd if="$S/indexed.bin" of=/tmp/tc093.expected bs=1 skip=28672 count=8192 2>/dev/null
+dd if=/mnt/g6/indexed.bin of=/tmp/tc093.actual bs=1 skip=28672 count=8192 2>/dev/null
+cmp /tmp/tc093.expected /tmp/tc093.actual
+```
+
+## Expected results
+
+- Mount succeeds without any `device.N` option.
+- Full-file and cross-32768-byte-chunk comparisons pass.
+- No external GEOM provider or device-table lookup is attempted.
+
+## Cleanup and zero-state check
+
+```sh
+umount /mnt/g6
+mdconfig -d -u 90
+kldunload erofs
+rm -f /tmp/tc093.expected /tmp/tc093.actual
+mount -p | awk '$3 == "erofs" { print }'
+mdconfig -l
+kldstat -n erofs 2>/dev/null || true
+sysctl -n kern.geom.conftxt | grep -E 'md90|erofs' || true
+```
+
+All four final outputs must be empty.