pqueue-bundle/tests/Fixtures/config/pqueue.yaml

pqueue:
  transport:
    class: 'Michel\PQueue\Transport\FilesystemTransport'
    options:
      directory: '%kernel.project_dir%/var/pqueue'
  handlers:
    sources:
      - '%kernel.project_dir%/MessageHandler'
    cache_dir: '%kernel.cache_dir%'