Xcode simulator on. Jenkins space crashes automated tests due to audio engine

Question

I have a swift app that has automated tests, a few of which trigger sounds for different things. They run fine on my local machine in a simulator and on a real device.

On our Jenkins machine which spins off slave nodes for each build, the tests that trigger audio crash. The root cause seems to that AvAudioPlayerNode fails due to the engine not running.

[avae] AVAEInternal.h:70:_AVAE_Check: required condition is false: [AVAudioPlayerNode.mm:536:StartImpl: (_engine->IsRunning())]

This worked fine in iOS 11.2 and Xcode 9. We've just got our Jenkins machine and code updated for iOS 12 and Xcode 10.

Has anyone seen this before?

Answer 1

I think the way the simulator is handling pass through from the microphone on the computer into the virtual microphone has changed in Xcode10. Jenkins and Travis computers often are virtual machines without a microphone at all.