Login checkout pane should show guest checkout greeting message

Let's automate that tests to ensure it works now and in the future.

@greggles what do you think, the tests might be quite heavy due to the Drupal Commerce dependencies and configuration. Should we merge it as-is or better invest the time for the test?
@Grevil what do you think?

I don't have a strong opinion on it. If someone doing the work is willing to do it then that seems great, but I agree it could be hard to get to testing this.

I bet it's not a hard job to add testing, composer req --dev drupal/commerce should work now instead of test_dependencies (used by DrupalCI)

As of #13

Alright all done! @Anybody, should we show the message only if the "Email registration guest registration after checkout" pane is enabled, or also when the "Guest registration after checkout" is enabled?

Checking both panes makes only sense. Creating tests now.

Alright, I refactored some of the existing test helping methods, adjusted Testclass names / folder structure and added the required test! Please review! 😊

Tests fail.

All green now, please review!

Thanks @Grevil for taking the time! :)

Automatically closed - issue fixed for 2 weeks with no activity.