The root cause of the issue is that Xcode / the iOS Simulator has issues in performance limited environments. This included Virtual Machines (which is how your builds are running on bitrise.io), MacBook Airs, Mac Minis with HDD storage, …
It can happen even if you use Apple’s Xcode Bots CI server on non SSD Mac Mini.
UI Tests fail to start
One or more UI Test case hangs
As reported in this StackOverflow answer & in this Apple dev forum discussion a possible workaround can be to not to store
**XCUIApplication()**in a variable, instead reference / use it directly. E.g. instead of:
let app = XCUIApplication() ; ... ; app.launch()do:
Others reported that if you add a delay (
sleep(10)) after every
app.launch()related to your tests, it can leave enough time for Xcode / the iOS Simulator to initialize the Accessibility labels, so that UI Tests can properly find the elements by the Accessibility labels. (Related Apple developer forum discussion)
Related: remove every explicit
Try another Simulator device
Some users had success with splitting the tests into multiple Schemes, and running those separately, with separate Test Steps.
A great article about splitting tests into multiple Schemes: http://artsy.github.io/blog/2016/04/06/Testing-Schemes
Try another Xcode version.