ARMI unit tests

Adding 3 test crumbs for requirements #4691

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Run time

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Job	Run time
build (3.7)	8m 59s
build (3.8)	8m 25s
build (3.9)	8m 21s
build (3.10)	8m 33s
build (3.11)	7m 36s
	41m 54s