XNAT Desktop Client Testing

Spectron is an integration testing framework that's built by the Electron development team (repo, including decent docs):

• Testing your Electron apps with ChromeDriver

• Write Automated Tests for Electron With Spectron, Mocha, and Chai (alternate link)

• Instrumenting Electron Apps for Security Testing

• Spectron questions on Stack Overflow

You can also test Electron applications with Selenium (the Applitools service that blog post is pimping looks pretty cool as well and they have a free trial and an open-source project licensing program). Here's more on Selenium and WebDriver from the Electron site.