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tests/TC009-statfs-basic.md

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+# Test Case: Basic statfs Information
+
+**Test ID**: TC009-statfs-basic
+
+## Objective
+
+Verify FreeBSD `statfs(2)` fields against the qualified image superblock.
+
+## Fixture
+
+Use `images/compact.erofs`. Before transfer, record `dump.erofs -s` and the
+`compact` superblock row in `fixture-evidence.txt`. Follow
+`tests/G1-MANUAL-SETUP.md` and compile `tests/statfs_probe.c` in the guest.
+
+## Procedure
+
+Host qualification:
+
+```sh
+dump.erofs -s /work/build/repo22-g1/images/compact.erofs
+python3 tests/erofs_fixture.py inspect /work/build/repo22-g1/images/compact.erofs
+```
+
+Guest dynamic check after mounting the image on `$mnt`:
+
+```sh
+./statfs_probe "$mnt"
+df -kT "$mnt"
+df -iT "$mnt"
+mount -p | awk -v p="$mnt" '$2 == p'
+```
+
+Unmount and detach the exact dynamic md unit.
+
+## Expected Results
+
+- `fstype=erofs`, `bsize=4096`, `iosize=4096`, and `readonly=1`.
+- `blocks` and `files` equal the image's declared block and inode counts.
+- `bfree`, `bavail`, and `ffree` are zero; `df` conversions agree.
+- `mount -p` contains `ro`; cleanup succeeds.
+
+`stat -f` is not a `statfs(2)` probe and must not be substituted.