At the present time, it's not possible for the majority of Moodle's plugin types to provide their own data generators for use in Behat tests. This is a severe hindrance for plugin maintainers – we can't complete our test suites without a fix for this.

This is because the current behat_data_generators::the_following_exist() implementation uses a hardcoded array of core-supplied data generators (behat_data_generators::$elements).

Following a forum discussion, I believe that Moodle should provide a new plugin-specific the following "{:frankenstylecomponentname}" "{:elementname}s" exist syntax. The presence of this statement in a scenario would cause Moodle to instantiate the {$frankenstylecomponentname}_generator class and invoke the create_{$elementname} method to create the object.

Acutally, the final decision for the form the step should take, similar to MDL-66559 and MDL-66335, is

Given the following "mod_quiz > user overrides" exist:

      | quiz           | user     | attempts |

      | Test quiz name | student1 | 2        |