This package build-depends on dbus-x11, and seems to be relying on X11
autolaunching to get a D-Bus session bus for its build-time tests: it
does not seem to explicitly invoke dbus-launch or dbus-run-session.

It also depends on dbus-x11 for autopkgtests (debian/tests/awesome), and
this time it explicitly invokes dbus-launch.

D-Bus X11 autolaunching is a poorly-understood legacy code path which
should be avoided where possible. Instead, please build-depend on
dbus-daemon and invoke a temporary D-Bus session bus explicitly, more
like this (untested):

override_dh_auto_test:
	make -C tests all
	GI_TYPELIB_PATH=tests LD_LIBRARY_PATH=tests \
		xvfb-run -a \
		dbus-run-session -- \
		dh_auto_test

This only requires a B-D on dbus-daemon <!nocheck>, which is a smaller
dependency than dbus-x11 and contains more robust code.

Similarly, for the autopkgtest, please depend on dbus-daemon and use
something more like (untested):

xvfb-run -s '-screen 0 1024x768x24' dbus-run-session -- awesome -c "$CONFIG"

Thanks,
    smcv