Flake8 and pytest

Add optional contrived candidate at exact center #131

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Run time

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Job	Run time
build (3.7)	1m 11s
build (3.8)	1m 20s
build (3.9)	1m 15s
build (3.10)	1m 13s
build (3.11)	1m 8s
build (3.12)	1m 41s
	7m 48s