update

tests/TC022-compact-inode-special.md

@@ -0,0 +1,31 @@
+# Test Case: Compact Special Inodes and Linux dev_t Decode
+
+**Test ID**: TC022-compact-inode-special
+
+## Objective
+
+Verify compact char/block/FIFO inodes and Linux `new_decode_dev` conversion to
+FreeBSD `dev_t`.
+
+## Fixture
+
+Use `images/compact.erofs`. Source metadata records real nodes
+`char-large=2748:344865`, `block-large=2748:344865`, and `fifo`; structured
+evidence asserts compact inodes and raw on-disk `i_u.rdev=0x543abc21` for both
+devices. Compile `tests/stat_special.c` natively in FreeBSD.
+
+## Procedure
+
+```sh
+./stat_special char  "$mnt/char-large"  2748 344865
+./stat_special block "$mnt/block-large" 2748 344865
+./stat_special fifo  "$mnt/fifo"
+stat -f '%N mode=%p rdev=%r' "$mnt/char-large" "$mnt/block-large" "$mnt/fifo"
+```
+
+## Expected Results
+
+- Char and block helpers report major 2748, minor 344865, and raw FreeBSD
+  `st_rdev=0xa430005bc21`.
+- FIFO type is correct and `st_rdev=NODEV`.
+- A raw little-endian cast would differ; all helper checks and cleanup pass.