testsuccess aptcache stats
cp rootdir/tmp/testsuccess.output stats.output
testsuccess test -s stats.output
+testfailureequal 'E: apt-cache stats does not take any arguments' aptcache stats foo
testsuccess aptcache xvcg foo
cp rootdir/tmp/testsuccess.output xvcg.output
testsuccess test -s xvcg.output