How can one reliably run unittests

[Dennis]

On Monday, 6 September 2021 at 16:55:30 UTC, deadalnix wrote:
> Damn, I don't know who that guy is, but it seems like he 
> foresaw the current mess that we are in.

The comment reads:

> I'm not convinced this is the right approach. The thing will 
> still fail to link when no main function is provided.
>
> IMO, it is better to do this as proposed by basil. I plan to do 
> a DMD PR.

So what happened to that plan? What's basil's proposal?