# Detox synchronization issues - Mon 8th Feb, 2020

I had some troubles getting a `useEffect` to fire (which is meant to bypass my app's login for e2e testing). I have had to change my approach for logging into the app during an e2e test. Below are some useful resources for the future:

https://github.com/wix/Detox/issues/1513
https://github.com/wix/Detox/issues/2622
https://github.com/wix/Detox/issues/2579

https://github.com/wix/Detox/blob/master/docs/Troubleshooting.Synchronization.md#identifying-which-synchronization-mechanism-causes-us-to-wait-too-much

https://github.com/wix/Detox/blob/master/docs/APIRef.DeviceObjectAPI.md#devicelaunchappparams

`React Native (bundle load)`
Detox seemed to get stuck on the actual JS bundle stage.

###### tags: `programmingjournal` `2021` `detox` `login`