Tests

Use `similar` methods from `ArrayPartion` for `NamedArrayPartition` #107

Job	Run time
Tests (1, Core) / Tests - Core	5m 57s
Tests (1, Downstream) / Tests - Downstream	15m 2s
Tests (lts, Core) / Tests - Core	5m 40s
Tests (lts, Downstream) / Tests - Downstream	8m 5s
Tests (pre, Core) / Tests - Core	5m 37s
Tests (pre, Downstream) / Tests - Downstream	15m 15s
	55m 36s

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