1. change computer name to be unique
2. close notification windows
3. turn on Do not disturb
4. disable firewall
5. close Finder windows

How to use:

- name: Prepare macOS runner
  uses: paulz/prepare-macos@v1

Example workflow

Xcode UI Tests are sensitive to open windows and interruptions. This action helps to prevent following system alerts during a test run:

1. Alert that computer with this name is already in use, see example
2. Notification Center alerts
3. macOS upgrade is available alerts
4. Firewall prompt to receive incoming connections
5. Finder window blocking screenshot

1. This action can run before checkout to rename computer earlier. It takes macOS a few seconds to report the conflict.
2. Reuse across multiple projects instead of copying shell script.
3. Put together ideas to help avoiding flaky UI tests.