Tests

Use getsym instead of an explicitly generated function and avoid writeback if nothing is returned #1874

Job	Run time
Tests (1, Extended) / Tests - Extended	19m 35s
Tests (1, FMI) / Tests - FMI	24m 47s
Tests (1, Downstream) / Tests - Downstream	32m 13s
Tests (1, Extensions) / Tests - Extensions	38m 54s
Tests (1, Initialization) / Tests - Initialization	32m 53s
Tests (1, InterfaceI) / Tests - InterfaceI	42m 37s
Tests (1, InterfaceII) / Tests - InterfaceII	54m 41s
Tests (1, RegressionI) / Tests - RegressionI	16m 18s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	21m 28s
Tests (lts, Downstream) / Tests - Downstream	21m 1s
Tests (lts, Extended) / Tests - Extended	11m 10s
Tests (lts, Extensions) / Tests - Extensions	24m 45s
Tests (lts, FMI) / Tests - FMI	15m 38s
Tests (lts, Initialization) / Tests - Initialization	22m 54s
Tests (lts, InterfaceI) / Tests - InterfaceI	31m 53s
Tests (lts, InterfaceII) / Tests - InterfaceII	52m 24s
Tests (lts, RegressionI) / Tests - RegressionI	8m 2s
Tests (pre, Downstream) / Tests - Downstream	14m 49s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	12m 5s
Tests (pre, Extended) / Tests - Extended	14m 42s
Tests (pre, Extensions) / Tests - Extensions	14m 46s
Tests (pre, Initialization) / Tests - Initialization	14m 58s
Tests (pre, FMI) / Tests - FMI	14m 30s
Tests (pre, RegressionI) / Tests - RegressionI	14m 59s
Tests (pre, InterfaceI) / Tests - InterfaceI	14m 59s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	37s
Tests (pre, InterfaceII) / Tests - InterfaceII	15m 18s
	10h 2m 56s

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