Tests

Merge pull request #244 from SciML/fm/sparse #110

Job	Run time
Tests (1, macos-latest) / Tests	9m 33s
Tests (1, ubuntu-latest) / Tests	13m 50s
Tests (1, windows-latest) / Tests	19m 47s
Tests (lts, macos-latest) / Tests	7m 27s
Tests (lts, windows-latest) / Tests	20m 36s
Tests (lts, ubuntu-latest) / Tests	10m 7s
Tests (pre, macos-latest) / Tests	10m 5s
Tests (pre, ubuntu-latest) / Tests	11m 33s
Tests (pre, windows-latest) / Tests	20m 7s
	2h 3m 5s

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