test code v1

tests/TC120-empty-file.md

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+# Test Case: Empty File Read
+
+**Test ID**: TC120-empty-file  
+**Category**: Boundary & Stress  
+**Priority**: Medium  
+**Regression**: None
+
+## Objective
+
+Verify exact zero-length inode, EOF, seek, hash, and close behavior.
+
+## Preconditions
+
+- Complete `G7-MANUAL-SETUP.md`.
+- Load the exact G7 KLD by full path.
+- Verify the guest copy of `SOURCE-SHA256SUMS` before mounting.
+
+## Manual Steps
+
+```sh
+G7=/root/repo22-g7
+FIX=$G7/fixtures
+SRC=$FIX/sources/boundaries/empty.bin
+IMAGE=$FIX/images/boundaries.erofs
+MNT=/mnt/repo22-g7-tc120
+E=$G7/evidence/TC120
+mkdir -p "$MNT" "$E"
+unit=$(mdconfig -a -t vnode -f "$IMAGE")
+printf 'md=%s\n' "$unit" | tee "$E/provider.txt"
+mount -t erofs -o ro "/dev/$unit" "$MNT"
+stat -f 'size=%z mode=%Sp name=%N' "$SRC" "$MNT/empty.bin" \
+  | tee "$E/stat.txt"
+source_hash=$(sha256 -q "$SRC")
+target_hash=$(sha256 -q "$MNT/empty.bin")
+printf 'source=%s\ntarget=%s\n' "$source_hash" "$target_hash" \
+  | tee "$E/hashes.txt"
+test "$source_hash" = "$target_hash"
+cmp "$SRC" "$MNT/empty.bin"
+"$G7/g7_probe" empty "$MNT/empty.bin" | tee "$E/probe.txt"
+umount "$MNT"
+mdconfig -d -u "${unit#md}"
+test -z "$(mount -p | awk -v m="$MNT" '$2 == m { print }')"
+test -z "$(mdconfig -l | tr ' ' '\n' | grep -x "$unit")"
+```
+
+## PASS Gate
+
+- Both sizes are exactly 0 and both SHA256 values are the empty-file hash.
+- `cmp` exits 0.
+- The probe reports `read_bytes=0`, both seek offsets 0, and exit 0.
+- The exact mount and md provider are absent after cleanup.
+
+Any kernel panic, trap, hang, or unexpected EROFS dmesg error is KFAIL and
+requires an issue report without changing `src`.