Tests

Use `similar` methods from `ArrayPartion` for `NamedArrayPartition` #106

Job	Run time
Tests (1, Downstream) / Tests - Downstream	15m 0s
Tests (lts, Downstream) / Tests - Downstream	7m 58s
Tests (1, Core) / Tests - Core	5m 26s
Tests (lts, Core) / Tests - Core	5m 28s
Tests (pre, Core) / Tests - Core	5m 25s
Tests (pre, Downstream) / Tests - Downstream	15m 6s
	54m 23s

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