Tests

Fix FastBroadcast extension for v1.0 API #388

Job	Run time
Tests (1, Downstream) / Tests - Downstream	2m 59s
Tests (pre, Core) / Tests - Core	6m 27s
Tests (1, nopre) / Tests - nopre	5m 58s
Tests (1, Core) / Tests - Core	6m 23s
Tests (lts, Core) / Tests - Core	16m 39s
Tests (lts, Downstream) / Tests - Downstream	2m 13s
Tests (pre, Downstream) / Tests - Downstream	3m 7s
Tests (lts, nopre) / Tests - nopre	9m 39s
	53m 25s

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