Add test coverage for xcode-beta

This was ommitted from commit ac6693ca

Not caught since CI does not have beta xcode installed
2 jobs for master in 3 minutes and 50 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #4131
autoscale-linux
linux

00:02:56

passed #4132
openswift
osx

00:00:53