# Raises an error if we cors.credentials value is incorrect
karma.bin-should-fail --log.format=text --log.config=false --log.level=error --config.file karma.yaml
! stdout .
stderr 'msg="Invalid cors.credentials value ''foo'' for alertmanager ''am1'', allowed options: omit, inclue, same-origin'

-- karma.yaml --
alertmanager:
  servers:
    - name: am1
      uri: https://localhost:9093
      cors:
        credentials: foo
