Improve test coverage about spots

[zenangst]

I'm gonna take a stab at this to see if we cannot get some more sane tests in the mix.

[onmyway133]

@zenangst What you think is right

[zenangst]

I'm gonna try to create some "real-life" scenarios and test the individual components to see that they behave accordingly both with composite spots inside and with component configuration. I think that would be great for regression testing. I also think that layout calculations could be tested, if you give it a set of components of a specific size, depending of the components of course, they should all end up setting the same container size in the end.

I might be interesting to do some UI testing as well, if possible.

[zenangst]

I'll move on to try and test the UI related code, specifically SpotsScrollView. This might be a challenge, but challenges are fun! 😁

[zenangst]

69% percent coverage... we can do better 😁

[zenangst]

I think we can just use codecov to monitor this now.