tests

Add numbered viewer variables to be able to access multiple created viewers #133

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Run time

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Job	Run time
ubuntu-latest py3.9	2m 42s
ubuntu-latest py3.12	2m 0s
windows-latest py3.9	3m 38s
windows-latest py3.12	2m 29s
macos-latest py3.9	30s
macos-latest py3.12	1m 4s
deploy	0s
	12m 23s