Darn, that is very unfortunate. As far as we are concerned Xcode 26 is dead in the water until this is resolved. We can't continue testing or consider adopting it despite being very motivated to do so.

I see below that someone reported this hasn't been resolved in Beta 5. This is a P1 blocker from our point of view, we cannot adopt or even further test Xcode 26 until this is resolved. Can you provide any more feedback about when we can expect a fix, or any insight into how we might reliably work around this issue?

Spoke too soon, works sometimes, not others. Back to beta 3.

This (hopefully temporary) hack is working for us, thank you!

Simply appending any additional argument after 'never' made it work

Confusing. 1) no help docs from xcodebuild. 2) xcodebuild test -project MyProject.xcodeproj -scheme ConfigTests -destination platform='iOS Simulator,name=iPhone 14,OS=16.1' -collect-test-diagnostics never xcodebuild: error: option -collect-test-diagnostics requires one of two values: on-failure or never xcodebuild test -project MyProject.xcodeproj -scheme ConfigTests -destination platform='iOS Simulator,name=iPhone 14,OS=16.1' -collect-test-diagnostics never Xcode14.1Workaround=YES

Confusing. 1) no help docs from xcodebuild. 2) xcodebuild test -project MyProject.xcodeproj -scheme ConfigTests -destination platform='iOS Simulator,name=iPhone 14,OS=16.1' -collect-test-diagnostics never xcodebuild: error: option -collect-test-diagnostics requires one of two values: on-failure or never xcodebuild test -project MyProject.xcodeproj -scheme ConfigTests -destination platform='iOS Simulator,name=iPhone 14,OS=16.1' -collect-test-diagnostics never Xcode14.1Workaround=YES