Save the node form through the Save button a person sees. An administration theme may clone the form's Save into a sticky action bar on top of the original, so the sticky clone is submitted when present, the plain #edit-submit otherwise, both through an in-page click that waits for the navigation. The saved node becomes "the content item I created" for the steps that view, edit or delete it.
When the browser refuses the submit because a required field is empty, the step fails at once with the browser's own message for each such field; it does not wait for a page that cannot come. A scenario that expects the refusal uses "I try to save the content".
Examples
When I save the content
And I save the content item
When we save the content
And I save the node
When we save the nodePattern
When(/^(I |we )*save the (?:content|content item|node)$/, …)Part of @webship-js/drupal-cms-steps (github.com/webship/drupal-cms-steps), a step pack for Webship-js 2.0.x.