Merge pull request #75 from breakroom/test-isolation #237

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Run time

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Job	Run time
test (1.15.x, 26.x, true)	1m 53s
test (1.14.x, 25.x)	1m 25s
test (1.13.x, 24.x)	1m 54s
test (1.12.x, 24.x)	1m 27s
	6m 39s