At the moment, to add a access restriction to an activity in Behat test it is required to do it manually:

Given I am on the "H5P Test" "h5pactivity activity editing" page logged in as teacher1

    And I expand all fieldsets

    And I click on "Add restriction..." "button"

    And I click on "Date" "button" in the "Add restriction..." "dialogue"

    And I set the following fields to these values:

      | Direction | from   |

      | x[day]    | 1      |

      | x[month]  | 1      |

      | x[year]   | <year> |

    And I press "Save and return to course"

The goal of this issue is to implement a custom step for activity restrictions to add restrictions in the backend and convert the manual steps to use the new step to speed up execution. Another reason for implementing this is because these availability tests require to be executed on browser because of @javascript, so converting those steps would also allow to run those tests on Browserkit (NonJS).