On my machine, the that call looks like its coming from dkms (and the problem looks like it would be common to all dkms packages).
Would a suggests on debhelper on that package would be sufficient?
- Bug#909183: zfs-dkms: 'dkms mkdeb -m zfs' requires dh_test... Mykola Nikishov
- Bug#909183: [zfs-dkms] Antonio Russo
