Specifying which Phobos modules to unittest

[Joseph Rushton Wakeling]

Hello all,

Is there any way to specify individual Phobos modules to unittest when building, 
instead of having to do the whole lot?

When working on 1 single module, it'd be nice to be able to unittest that one 
alone and not have to worry about doing the complete set of tests until ready to 
push back to GitHub.

Can anyone advise?

Thanks & best wishes,

     -- Joe