where the naming is left completely on lvm.
(Commited code has been different version of test).
So here it should be able to figure out new free name and create a new LV.
dd if="$dev1" of=backup_i bs=256K count=1
dd if="$dev2" of=backup_j bs=256K count=1
-lvcreate -l1 -n $lv1 $vg $dev1
+lvcreate -l1 $vg $dev1
dd if=backup_j of="$dev2" bs=256K count=1
dd if=backup_i of="$dev1" bs=256K count=1
# device-mapper: create ioctl failed: Device or resource busy
# Failed to activate new LV.
-should lvcreate -l1 -n $lv1 $vg $dev1
+should lvcreate -l1 $vg $dev1