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iOS testbed fails to start on completely clean Xcode install machine #130292

Description

@freakboy3742

Bug report

Bug description:

The iOS testbed contains tooling to tail the log of a simulator while a test suite runs. It identifies the simulator by generating an initial list of simulators; and then polling until that list increases by one entry. To do this, it uses the command xcrun simctl --set testing list -j

However, on a complete clean development machine, there are no testing devices yet, and xcrun simctl --set testing list -j returns an error code of 1, rather than an empty list.

Github Actions CI is one example of this configuration. A workaround is to manually create the ~/Library/Developer/XCTestDevices folder.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Other

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  1. added
    3.13only security fixes
    3.14bugs and security fixes
    type-bugAn unexpected behavior, bug, or error
    on Feb 19, 2025
  2. added a commit that references this issue on Feb 25, 2025
  3. added a commit that references this issue on Feb 25, 2025
  4. added a commit that references this issue on Feb 25, 2025
  5. added 3 commits that reference this issue on Feb 25, 2025
  6. added 3 commits that reference this issue on Mar 16, 2025
  7. added 3 commits that reference this issue on Feb 3, 2026
  8. added 2 commits that reference this issue on Jun 12, 2026
  9. added 2 commits that reference this issue on Oct 2, 2026
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    3.13only security fixes3.14bugs and security fixesOS-iostype-bugAn unexpected behavior, bug, or error

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