addon-storyshots-puppeteer: per story beforeSnapshot function

[danielo515]

Is your feature request related to a problem? Please describe.
Storyshots-puppeteer is amazing in the sense that I get free test for almost all my components, that is awesome.
However, sometimes I add artificial options to some of my components so I can test them properly. Forcing states like :hover or opening modals that are not meant to be controlled can be tricky.

Describe the solution you'd like
I would love to be able to define a function per story so I can trigger some states before the snapshot is taken, so I don't need to add unneeded features to my components.

Describe alternatives you've considered
Right now, the only option I see fit is to define my own API using the current beforeSnapshot global function

Are you able to assist bring the feature to reality?
I can assist, but don't have time to code a solution

[ndelangen]

The future of storyshots is the test-runner:
https://storybook.js.org/docs/react/writing-tests/test-runner#page-top

And use the play function for expectations:
https://storybook.js.org/docs/react/writing-stories/play-function#page-top

We will not be making any improvement / changes to storyshots.