Hi, nice. Thank you!
I noticed that on a default setup kernel-headers are not installed and so tests do still fail. See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=945594 I assume - since it is hard to generically include this as a dependency in the control file, it would be better if dkms autopkgtest installs the dependency during the test if needed. Best regards Hanno