perform a test during a mousedown event

I want to write a test when the mousedown event is triggered. A class is add during the mousedown and removed at the mouseup event. At the moment it is only possible to perform a ".click()" which triggers a mousedown and also a mouseup event so I can not test if the class is added between the mousedown and the mouseup event.

Start by tracing the existing .click() entry point and how it dispatches mousedown and mouseup events. The work is done when a test can trigger mousedown independently, observe the class while it is present, and then trigger mouseup to verify its removal.

Written by the indexing model from the issue text.