How to test Theia electron app using Spectron ?

[kingkan143]

Need to test Theia Electron app as Integrated system test.

[vince-fugnitto]

@kingkan143 we currently do not test our example-electron application with Spectron.
If you're going to add Spectron for your own application then the best place to start would be their dcoumentation (I'm not sure how much the community can help as it was never added before).