How integreate 'selectors' with Behat (regon_map is requreid to work with selectors)

behat.yml

default:
  paths:
    features: 'features'
  extensions:
    Behat\MinkExtension\Extension:
      goutte: ~
      selenium2: ~
      base_url: https://production.server/
    Drupal\DrupalExtension\Extension:
      blackbox: ~
      region_map:
        content: "#content"
        footer: "#footer"
        left header: "#header-left"
        right header: "#header-right"
        right sidebar: "#column-right"
      selectors:
        message_selector: '.messages'
        error_message_selector: '.messages.messages-error'
        success_message_selector: '.messages.messages-status'

I am working with Drupal 8 version 8.5.0, and I had to change messages-error to messages--error and messages-status to messages--status in order to make it work. Thank you for the great snippet of code!

Thanks for making this public, really helpful 👍