Add Tests

[stamoun]

Add testing ability for the various React components (unit) or for the whole electron app (integration/system).

For system/integration, Spectron should be used (https://www.electronjs.org/spectron).

No idea if you have a preference for a given framework (mocha, jest, enzyme?), I think the app would benefit from being testable. (this can go alongside with the implementation of CI/CD).

Definitely an enhancement :)

[dvx]

I have experience with both Mocha and Jest, so it's a toss-up from my end. I totally agree that testing should be a roadmap priority!