Tests

Use getsym instead of an explicitly generated function and avoid writeback if nothing is returned #1878

Job	Run time
Tests (1, Downstream) / Tests - Downstream	25m 59s
Tests (1, Extended) / Tests - Extended	19m 46s
Tests (1, Extensions) / Tests - Extensions	44m 2s
Tests (1, FMI) / Tests - FMI	25m 19s
Tests (1, Initialization) / Tests - Initialization	31m 13s
Tests (1, InterfaceI) / Tests - InterfaceI	42m 34s
Tests (1, InterfaceII) / Tests - InterfaceII	54m 50s
Tests (1, RegressionI) / Tests - RegressionI	15m 58s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	21m 23s
Tests (lts, Extended) / Tests - Extended	10m 56s
Tests (lts, Downstream) / Tests - Downstream	16m 45s
Tests (lts, Extensions) / Tests - Extensions	28m 55s
Tests (lts, FMI) / Tests - FMI	16m 50s
Tests (lts, Initialization) / Tests - Initialization	23m 14s
Tests (lts, InterfaceI) / Tests - InterfaceI	31m 26s
Tests (lts, InterfaceII) / Tests - InterfaceII	51m 52s
Tests (lts, RegressionI) / Tests - RegressionI	7m 59s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 45s
Tests (pre, Downstream) / Tests - Downstream	15m 6s
Tests (pre, Extended) / Tests - Extended	14m 43s
Tests (pre, Extensions) / Tests - Extensions	15m 4s
Tests (pre, FMI) / Tests - FMI	15m 13s
Tests (pre, Initialization) / Tests - Initialization	14m 35s
Tests (pre, InterfaceI) / Tests - InterfaceI	14m 40s
Tests (pre, InterfaceII) / Tests - InterfaceII	15m 47s
Tests (pre, RegressionI) / Tests - RegressionI	15m 32s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	14m 36s
	10h 16m 2s

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