Test External

`ChildProcess` is not shared between tests, inline it. #853

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Run time

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Job	Run time
3.1 on ubuntu	1m 45s
3.2 on ubuntu	2m 0s
3.3 on ubuntu	1m 57s
3.1 on macos	1m 46s
3.2 on macos	1m 27s
3.3 on macos	1m 30s
	10m 25s