Enhance unit test coverage #1617

Job	Run time
linux-gallery-python3.9-minimum	2m 16s
linux-python3.9-minimum	6m 23s
linux-gallery-python3.13-upgraded	4m 39s
linux-python3.13-upgraded	5m 5s
windows-gallery-python3.9-minimum	3m 57s
windows-python3.9-minimum	6m 35s
windows-gallery-python3.13-upgraded	8m 55s
windows-python3.13-upgraded	6m 22s
macos-python3.9-minimum	7m 47s
macos-python3.13-upgraded	2m 51s
conda-linux-gallery-python3.13-ros3	1m 19s
conda-linux-python3.13-ros3	1m 33s
conda-linux-python3.9-minimum	6m 1s
conda-linux-python3.13-upgraded	4m 47s
Deploy pre-release from dev	1s
	1h 8m 31s

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