Test pipeline

Add example of using the Starlette test client with tox #1234

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Run time

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Job	Run time
test (3.8)	2m 25s
test (3.9)	1m 45s
test (3.10)	1m 41s
test (3.11)	2m 9s
test (3.12)	1m 45s
finish-coveralls	0s
	9m 45s