Integration tests

Replace datetime.utcfromtimestamp #976

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Run time

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Job	Run time
test libev (3.8)	31m 8s
test asyncio (3.8)	32m 24s
test asyncore (3.8)	31m 19s
test libev (3.11)	28m 48s
test asyncio (3.11)	28m 57s
test asyncore (3.11)	29m 35s
test libev (3.12)	29m 13s
test asyncio (3.12)	29m 17s
test libev (3.13)	26m 53s
test asyncio (3.13)	27m 2s
	4h 54m 36s