Ah ha, plain
$ test
with no arguments is not documented. The closest thing documented is
$ test STRING
but when
$ string=; test $string
then sorry. Not documented. man test, help test, info test, /usr/bin/[ --help,
nope, not documented.
If the result is not defined, still document that fact.
And, document plain
$ test -n
which acts differently than plain
$ test
In info one sees,
Besides the options below, a single argument is also allowed.
But still you haven't mentioned what about no arguments.
BTW, the test manpage perhaps should take a lesson from bash's help
test, and not say recursive things like
EXPRESSION is true or false and sets exit status. It is one of:
( EXPRESSION )
EXPRESSION is true
until further down the page after first lays out what EXPRESSION is.
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