Enhance unit test coverage #1611

Job	Run time
linux-gallery-python3.9-minimum	2m 10s
linux-gallery-python3.13-upgraded	4m 37s
linux-python3.9-minimum	6m 53s
windows-gallery-python3.9-minimum	3m 4s
linux-python3.13-upgraded	5m 6s
windows-python3.9-minimum	6m 42s
windows-gallery-python3.13-upgraded	7m 38s
conda-linux-python3.9-minimum	5m 58s
windows-python3.13-upgraded	6m 20s
macos-python3.9-minimum	7m 45s
conda-linux-python3.13-upgraded	4m 32s
macos-python3.13-upgraded	2m 49s
conda-linux-gallery-python3.13-ros3	1m 34s
conda-linux-python3.13-ros3	1m 41s
Deploy pre-release from dev	1s
	1h 6m 50s

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