consistently when command line arguments --verbose (or -v),
--debug (or -d), and --immediate (or -i) is given.
+If you need to skip all the remaining tests you should set skip_all
+and immediately call test_done. The string you give to skip_all will
+be used as an explanation for why the test was skipped. for instance:
+ if ! test_have_prereq PERL
+ skip_all='skipping perl interface tests, perl not available'