Tests

Fix issparse for AbstractVectorOfArray #230

Job	Run time
Tests (1, Core) / Tests - Core	5m 32s
Tests (lts, Downstream) / Tests - Downstream	10m 10s
Tests (pre, Downstream) / Tests - Downstream	17m 13s
Tests (lts, Core) / Tests - Core	4m 14s
Tests (pre, Core) / Tests - Core	5m 30s
Tests (1, Downstream) / Tests - Downstream	17m 44s
	1h 0m 23s

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