Consider adding golden tests

[n-bernat]

When developing new features it's important to avoid regressions.

Since this package is very UI-specific, golden tests would be useful to ensure that nothing breaks.

While I'm working on rounded section radius for the pie chart, I've noticed some issues with my implementation, that would be easier to spot early on with golden tests that provide a reference image.

There is a package called alchemist that can help implement golden tests.

[imaNNeo]

Hi @n-bernat
Thanks for your great suggestion.
I remember we had some golden tests, but we decided to remove them (I don't remember the reason)
But I agree that they are super helpful here.

Do you have time to help us set it up?
You can start simple and add a simple test for a chart