Tests

Merge pull request #2937 from SciML/myb/pss #84

Job	Run time
Tests (Downstream) / Tests - Downstream	10m 31s
Tests (Extensions) / Tests - Extensions	8m 43s
Tests (InterfaceI) / Tests - InterfaceI	30m 22s
Tests (InterfaceII) / Tests - InterfaceII	9m 54s
Tests (RegressionI) / Tests - RegressionI	7m 30s
	1h 7m 0s

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