* gnu/tests/base.scm (%test-basic-os): Use 'start-service' instead of a busy loop to wait for 'term-tty1'.
* gnu/system/vm.scm (virtualized-operating-system): Export. * gnu/tests/base.scm: New file. * gnu/local.mk (GNU_SYSTEM_MODULES): Add it. * Makefile.am (check-system): New target.