There are a few misfeatures in `test`, though. For instance, one way to use it is test somestring to test if "somestring" is empty. POSIX mandates that te

There are a few misfeatures in `test`, though. For instance, one way to use it is test somestring to test if "somestring" is empty. POSIX mandates that test with exactly one argument succeeds iff that argument is a non-empty string, to allow that. Fish's test is POSIX-conformant. Now, that means that test -n is true! Which is also triggered for test -n $var if $var has 0 elements. This is a problem and should be improved.