Try jest-electron-runner, compare to karma-electron

[trusktr]

https://github.com/facebook-atom/jest-electron-runner

See if it is faster than our current karma-electon setup or not.

[trusktr]

Also see how to run Jest within Karma, in case Karma is faster and we prefer the Jest API (which matches the as-pect API we use in lume/glas, so we'll have consistency): jestjs/jest#848 (comment)

[trusktr]

We will make the main test runner be web-test-runner, and remove Karma in lume/lume#268. We might want to add something like jest-electron-runner for tests that use Electron/Node APIs.