Unit Tests

Add and integrate `FuturesExecutorMixin` #4191

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Run time

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Job	Run time
test-bare (3.9)	31s
test-ubuntu (3.9)	3m 38s
test-windows (3.9)	7m 19s
test-ubuntu (3.10)	3m 37s
test-ubuntu (3.11)	3m 37s
test-ubuntu (3.12)	3m 38s
	22m 20s