Test External

Require shared endpoint by default. (#148) #186

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Run time

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Job	Run time
3.0 on ubuntu	1m 35s
3.1 on ubuntu	1m 39s
3.2 on ubuntu	1m 36s
3.0 on macos	1m 43s
3.1 on macos	1m 58s
3.2 on macos	2m 9s
	10m 40s