Tests

Improve BlockUnitRange indexing #553

Job	Run time
Tests (lts, macOS-latest) / Julia lts - macOS-latest	6m 16s
Tests (lts, windows-latest) / Julia lts - windows-latest	11m 48s
Tests (1, ubuntu-latest) / Julia 1 - ubuntu-latest	16m 48s
Tests (1, windows-latest) / Julia 1 - windows-latest	18m 0s
Tests (1, macOS-latest) / Julia 1 - macOS-latest	9m 32s
Tests (lts, ubuntu-latest) / Julia lts - ubuntu-latest	10m 53s
	1h 13m 17s

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