DMD: how to restore old unittest+main

[novice3]

On Thursday, 13 August 2020 at 08:30:44 UTC, Jonathan wrote:
> Is there a reason you need to run all unittests every time you 
> want to run the program?

Starting app with unittests while develop - frequent event for me.
Releasing app - rare event for me.
I want do frequent action without efforts (just start and see all 
ok - unitests and main),
and can do rare action (release) with some efforts (compile with 
other switches).