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tests/TC001-mount-basic.md

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+# Test Case: Basic Mount and Unmount
+
+**Test ID**: TC001-mount-basic
+
+## Objective
+
+Verify that the exact G1 KLD mounts a valid image read-only, exposes source
+data exactly, and unmounts cleanly.
+
+## Fixture
+
+Use `images/compact.erofs` and `source/compact/root.txt` generated by
+`tests/prepare_g1_fixtures.sh`. Follow `tests/G1-MANUAL-SETUP.md` and record the
+image, source, and KLD SHA256 values.
+
+## Procedure
+
+```sh
+image=/tmp/repo22-g1/images/compact.erofs
+source=/tmp/repo22-g1/source/compact/root.txt
+mnt=/mnt/repo22-g1-001
+md=$(mdconfig -a -t vnode -f "$image")
+mkdir -p "$mnt"
+kldstat | grep -i erofs
+mount -t erofs -o ro "/dev/$md" "$mnt"
+mount -p | awk -v p="$mnt" '$2 == p'
+cmp "$source" "$mnt/root.txt"
+sha256 "$source" "$mnt/root.txt"
+./statfs_probe "$mnt"
+umount "$mnt"
+mdconfig -d -u "${md#md}"
+rmdir "$mnt"
+```
+
+## Expected Results
+
+- Mount, `cmp`, `statfs_probe`, unmount, and detach all return zero.
+- The mount entry is `erofs` and read-only; both file hashes are identical.
+- Cleanup leaves neither this mount point nor its md provider.