Can we bring 'test' applet's help back?

[Kang-Che Sung]

This is just an idea.

After 'test' and '[' become separate, individually selectable applets, it
could be possible to bring the help of '[' and '[[' back after they got
removed in commit de5edadee2dca2896492f97ab3a56e389305e74d
("special-case {true,false,test} --help")

I mean that "test --help" will still display nothing, but "[ --help" without
the closing "]" or "[[ --help" without "]]" can show the help text.

So, is this a good idea?