Assert the confirmation a webform shows after a submission is, or is not, on screen, optionally with its text.
Examples
Then I should see the form confirmation
And I should see the form confirmation "Thanks for contacting us!"
Then I should not see the form confirmation
And we should see the form confirmation "We have received your message"
Then we should not see the form confirmation "Thanks"
Pattern
Then(/^(I |we )*should( not)* see the form confirmation(?: "([^"]*)")?$/, …)
Part of @webship-js/drupal-cms-steps (github.com/webship/drupal-cms-steps), a step pack for Webship-js 2.0.x.