Add tests for `recursive_unicode` function #3046

Job	Run time
changes	7s
gatekeeper	3s
env	1s
application_tester_draft / run (ubuntu-latest)	2m 54s
application_tester / run (windows-latest)	4m 7s
coverage_draft / generate and upload	3m 24s
application_tester / run (macos-latest)	3m 5s
guitest / run (ubuntu-latest)	1m 2s
guitest / run (macos-latest)	1m 39s
guitest_draft / run (windows-latest)	2m 33s
documentation / build	10s
pytest / run (windows-latest)	5m 54s
mac / build	10m 21s
pytest / run (macos-latest)	6m 45s
scripttest_draft / run	1m 5s
ubuntu / build	5m 21s
windows / build	4m 36s
	53m 7s

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