CI Build hangs indefinitely when uitests present

Our automated tester has a suite of ui tests he's been working on. When these are enabled on our release pipeline they are:

  1. Very slow
  2. While all tests pass, when building the app afterwards the build hangs indefinitely

When disabling the tests the build is successful. The build machine is a 2020 M1 with 16GB ram running Xcode 13.1, I remoted in while it was running and the CPU usage / Ram seemed fine.

The CI log / Fastlane gives no error indication, it just freezes trying to link a library and I have to manually cancel the build

I'm wondering if the tests have exhausted something within Xcode build itself so it gives up at a certain point, is there anything obvious I can check?

Thanks

CI Build hangs indefinitely when uitests present
 
 
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