Use C++ testing framework

[Yuriy Skalko]

On 16.12.2020 22:14, Yuriy Skalko wrote:
> There were already several discussions here in 2013, 2015 and even in 
> 1999 about using some unit testing framework, but without any tangible 
> result. I think it is now time to change this :)
> 
> There are several widely used frameworks, I've chosen "doctest" 
> (https://github.com/onqtam/doctest/). It is not the most popular, but is 
> the fasest and has small size -- it consists of only one file. Also it 
> is very convenient to use 
> (https://github.com/onqtam/doctest/blob/master/doc/markdown/tutorial.md).
> 
> Now LyX has some simple hand-made unit testing in `tests` directories 
> that is used to test a few base classes/functions. I've converted some 
> of these tests to the new framework.
> 
> I only updated/added CMake files and these surely will require further 
> improvements.
> 
> So, what is your opinion about this change? Comments are very appreciated.
> 
> 
> Yuriy

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