[Feature]: Fake Timers

[daniel-nagy]

It looks like fake timers have been purposefully turned off. Would it be possible to implement fake timers?

[aaronabramov]

there was an issue with a shared state in the early version of this runner (all tests shared the same window) and using fake timers was really unsafe, but i think current implementation should allow implementing fake timers. i have not looked into it yet!

pull request would be appreciated 🙂
here's where they're initialized (or disabled in this case)
https://github.com/facebook-atom/jest-electron-runner/blob/master/packages/electron/src/Environment.js#L24-L30

[daniel-nagy]

Unsafe as in Spectre and Meltdown unsafe?

[aaronabramov]

not that unsafe 😅
but potentially can leak state from one test to another. I think right now we're running every test in a separate electron window and disposing it after the test is done, so it should be easy to implement the same support as the main jest runner

[steel]

I created a PR here: #67

[witthong]

Would it be possible to implement fake timers?