Unit testing

Fix #2658: Use `is not None` for `boundary_left` and `boundary_right`… #3845

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Run time

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Job	Run time
Unit tests (ubuntu-latest, 3.12, x64)	1m 6s
Unit tests (ubuntu-latest, 3.11, x64)	1m 6s
Unit tests (ubuntu-latest, 3.10, x64)	1m 13s
Unit tests (ubuntu-latest, 3.13, x64)	58s
	4m 23s