How to pass an option containing a space to a package in LaTeX/XeLaTeX

Question

When I declare an option containing a space, LaTeX/XeLaTeX eats it.

In the main .tex, I have :

\usepackage[test font]{test}

In my .sty file I have :

\DeclareOption*{\newfontfamily\testfont[Scale=1]{\CurrentOption}}
\ProcessOptions

But the Tex engine passes to the package testfont option and not test font.

So the question is how to pass the option containing the space to the package.

Answer 1

Protect it with braces

\usepackage[{test font}]{test}

Answer 2

Try

\catcode`\ =11
\usepackage[test font]{test}
\catcode`\ =10

This is quite likely to fail, but the failure might be progress on what we have so far.