Pantheon Build Tools with Lando Behat Testing

.lando.yml

name: some-site
recipe: pantheon
config:
  framework: drupal8
  env: dev
  site: some-site
  id: some-uuid-string-here
  drush: 8.3
  php: '7.3'
  webroot: web
  xdebug: true

services:
  appserver:
    overrides:
      environment:
        BEHAT_PARAMS: >-
          {"extensions" : {"Behat\\MinkExtension" : {"base_url" :
          "http://appserver_nginx/"}, "Drupal\\DrupalExtension" : {"drush" :   {
          "root":  "/app/web" }}}}
  qa:
    type: compose
    services:
      image: quay.io/pantheon-public/build-tools-ci:6.x
      user: root
      ports:
        - '9222'
      command: "google-chrome --disable-gpu --headless --remote-debugging-address=0.0.0.0 --remote-debugging-port=9222 --no-sandbox </dev/null &>/dev/null &"
      environment:
        DEV_SITE_URL: https://dev-site-name.pantheonsite.io
        MULTIDEV_SITE_URL: https://appserver_nginx
        NODE_EXTRA_CA_CERTS: /user/.lando/certs/lndo.site.pem
tooling:
  backstop:
    service: qa
    cmd:
      - "backstop reference --config=.ci/test/visual-regression/backstopConfig.js"
      - "backstop test --config=/app/.ci/test/visual-regression/backstopConfig.js"
  behat:
    service: qa
    cmd: "/app/vendor/bin/behat -c /app/tests/behat/behat-lando.yml"

behat-lando.yml

#
# behat.yml file for testing locally with lando.
#
default:
  suites:
    default:
      paths:
        - %paths.base%/features
        - %paths.base%/site-features
      contexts:
        - FeatureContext
        - Drupal\DrupalExtension\Context\DrupalContext
        - Drupal\DrupalExtension\Context\MinkContext
        - Drupal\DrupalExtension\Context\MessageContext
        - Drupal\DrupalExtension\Context\DrushContext
        - FailAid\Context\FailureContext
  extensions:
    Behat\MinkExtension:
      files_path: './data-files'
      # base_url set by ENV
      browser_name: chrome
      sessions:
        default:
          chrome:
            api_url: "http://qa:9222"
            validate_certificate: false

    Drupal\DrupalExtension:
      blackbox: ~
      api_driver: 'drush'
      drush:
        root: '/app/web'

    DMore\ChromeExtension\Behat\ServiceContainer\ChromeExtension: ~

A Micro-improvement here would be to use the same behat.yml file that pantheon does.... but add a profile for pantheon and a profile for lando...
What this does is keeps yoru other parts of tests DRY. Specifically in this scenario you have to duplicate all the configuration for your contexts, paths, and any other settings (like selectors) across both behat yaml files. Using profiles lets you do the work once.

That said, I culdn't figure out a way to NOT have to duplicate pretty much everything under Behat\MikeExtension in the profile settings... See https://gist.github.com/generalredneck/9091aa83f3e4deac97daa6044653e49d/revisions for the changes I would make

Edit:
Pro Tip: Make sure you double check your $settings['trusted_host_patterns']. It might not like appserver_nginx out of the box.

Should I be setting a base_url here - it states #base_url set by ENV - this is unclear to me.

I'm using this precise configuration but am getting this error:

Could not fetch version information from http://192.168.16.8:9222/json/version. Check if Chrome is running. See docs/troubleshooting.md if Chrome crashed unexpectedly.