Unit Tests

Add and integrate `FuturesExecutorMixin` #4190

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Run time

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Job	Run time
test-bare (3.9)	57s
test-ubuntu (3.9)	5m 19s
test-windows (3.9)	12m 18s
test-ubuntu (3.10)	4m 36s
test-ubuntu (3.11)	5m 3s
test-ubuntu (3.12)	5m 11s
	33m 24s