Is phobos too fluffy?

[Imperatorn]

On Saturday, 19 September 2020 at 09:45:13 UTC, Russel Winder 
wrote:
> On Sat, 2020-09-19 at 09:15 +0000, Imperatorn via Digitalmars-d 
> wrote:
>> On Saturday, 19 September 2020 at 06:59:54 UTC, Jonathan M 
>> Davis
> […]
>> 
>> "It's very common practice"
>> 
>> Actually no it is not. D is the only example I've seen that 
>> routinely does this. Virtually all other languages separate 
>> code and tests.
>
> Rust has unit tests in the source modules, just as D does. It 
> works very well.
>
> Rust also has ways of doing integration and system testing, 
> where the tests are separate. It works very well.

I get the point in doing so. What I mean is that explains why 
Phobos is "fluffy" then, and it's probably not a problem