Interface tests

Fix for product of `Dirichlet` #633

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Run time

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Job	Run time
test (1.6, ubuntu-latest, x64)	12m 20s
test (1.6, macOS-latest, x64)	11m 34s
test (1, ubuntu-latest, x64)	10m 46s
test (1, macOS-latest, x64)	10m 41s
	45m 21s