Help with showing sidebar widgets by default

Please could someone help me solve this?

Is there something I can add to the register sidebar and register sidebar widget function so that the widget displays on the sidebar by default, rather than the use having to drag it there.

I want them to be able to drag it off to make it inactive, but I want it to display by default.

I know how to register a dynamic sidebar called ‘Sidebar Test’ and a widget called ‘Widget Test’. I just need to know how to make Widget Test show by default in Sidebar Test when the functions file of the theme is executed.

Thank y ou