Open and close forms in the unit tests should be avoided

[DanicaSTFC]

When we run the unit tests forms are opened and closed quickly on the screen. It would be better if this did not happen unless strictly necessary. The forms could only exist in the background or the open and close functionality be mocked.

[DanicaSTFC]

On 13/12/2023 Edo Laura and I decided to work on this issue with low priority. Danica should try to understand how much work is required to solve this and then decide whether to include it in the milestone.

[DanicaSTFC]

On 19/02 we made the github action skip one of the test files, due to some errors in using the screen and setting CI to 1. See PR #124 Ideally, we would want the GH actions to automatically run the tests and therefore resolving this issue becomes important.