I ran into this while writing behat scenario file for a plugin. I did not need any JS so the test was without the @javascript tag.

I have a form with advcheckbox field with the value set to 1 by default (block instance configuration form). In behat, I need to go to the form, uncheck it, save the form and test the effect.

Given I add the "Muhehe" block

And I configure the "Muhehe" block

And I set the following fields to these values:

  | Checkbox field checked by default | 0 |

When I press "Save changes"

Then ...

This does not work for me and the form is always saved with the checkbox field kept checked. I am quite sure I tried all variants like

• using label, name ad id of the field as the selector
• using I set the field "Checkbox field" to "0"
• using empty string "", zero string "0" and zero 0

nothing helped.

Only way to make it behave as expected was to run the test via real browser, i.e. add the @javascript tag to the feature file.

This was discussed with stronk7 at https://moodle.org/local/chatlogs/index.php?conversationid=19649 and was concluded to be a bug.