searx/tests/unit/settings/user_settings_keep_only.yml

use_default_settings:
    engines:
        keep_only:
            - wikibooks
            - wikinews
server:
    secret_key: "user_secret_key"
    bind_address: "0.0.0.0"
    default_http_headers:
        Custom-Header: Custom-Value
engines:
    - name: wikipedia
    - name: newengine
      engine: dummy