How to test fluentui v9 combobox correctly?

[rosergeev]

Hi there!
I don't get how to write tests that are related to combobox or other fluentui components that dynamically insert something to the root node of the DOM, e.g. Calendar's popup.
Here it is the simple test repro https://codesandbox.io/p/devbox/testcombobox-jyvp8t?file=%2Fsrc%2FComponents%2FComboWrapper.test.tsx%3A6%2C49
In this test I would like programmatically open Combobox and select second element.
How to achieve this?

[bsunderhus]

The listbox (popover) of a Combobox is inside a Portal, and portals do not render on node environment. I'd recommend using some browser environment testing tool, like playwright or cypress, as in those environments portals would render.

[rosergeev]

Thank you for your answer, now it's much clearer!