unittests, dub and libraries

[Jesse Phillips]

On Wednesday, 28 March 2018 at 03:07:23 UTC, Jonathan M Davis 
wrote:
> Run
>
>     dub test
>
> The problem is that an executable needs a main, and a library 
> doesn't have one, whereas when you're testing a library, you 
> need an executable. So, a main must be inserted - e.g. with the 
> -main flag to dmd. Just building the unittest build doesn't 
> insert one. However, dub test _does_ deal with that for you.
>
> - Jonathan M Davis

And a note on the reverse, if you have an executable project $ 
dub test won't build in the app.d file since it contains main and 
dub test wants to avoid running your main function.