UserInput.js:4: add tests

[0pdd]

The puzzle 0-cde23681 from #0 has to be resolved:

mr-git-cli/lib/UserInput.js

Line 4 in 28ccec6

// @todo #0:1h add tests

The puzzle was created by @jonny64 on 21-Sep-24.

Estimate: 60 minutes, role: DEV.

If you have any technical questions, don't ask me, submit new tickets instead. The task will be "done" when the problem is fixed and the text of the puzzle is removed from the source code. Here is more about PDD and about me.