* Tests for core Buildsystem API (mostly path API).
* Tests for check_auto_configure() for each buildsystem.
* Build system autoselection tests under "typical" conditions for each buildsystem.
* DH_AUTO_OPTIONS and command line argument parsing tests.
* Real dh_auto_* tests for autoconf/makefile build systems with emulated.
autoconf behaviour under in both in source and out of source tree scenarios.