Tests

refactor: change problem constructors to `XProblem(sys, op[, tspan])` #2013

Job	Run time
Tests (lts, Downstream) / Tests - Downstream	35s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	19m 32s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	36s
Tests (pre, Extensions) / Tests - Extensions	14m 26s
Tests (lts, RegressionI) / Tests - RegressionI	32s
Tests (1, Extended) / Tests - Extended	19m 23s
Tests (lts, Extensions) / Tests - Extensions	34s
Tests (1, Extensions) / Tests - Extensions	24m 27s
Tests (1, InterfaceII) / Tests - InterfaceII	36m 36s
Tests (1, RegressionI) / Tests - RegressionI	16m 15s
Tests (pre, InterfaceI) / Tests - InterfaceI	14m 36s
Tests (1, Initialization) / Tests - Initialization	20m 46s
Tests (lts, InterfaceI) / Tests - InterfaceI	30s
Tests (lts, InterfaceII) / Tests - InterfaceII	29s
Tests (1, Downstream) / Tests - Downstream	14m 59s
Tests (pre, InterfaceII) / Tests - InterfaceII	14m 34s
Tests (pre, FMI) / Tests - FMI	14m 19s
Tests (1, FMI) / Tests - FMI	25m 48s
Tests (pre, Downstream) / Tests - Downstream	14m 29s
Tests (lts, FMI) / Tests - FMI	32s
Tests (lts, Initialization) / Tests - Initialization	34s
Tests (1, InterfaceI) / Tests - InterfaceI	41m 1s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	14m 19s
Tests (pre, RegressionI) / Tests - RegressionI	14m 14s
Tests (pre, Extended) / Tests - Extended	14m 0s
Tests (lts, Extended) / Tests - Extended	31s
Tests (pre, Initialization) / Tests - Initialization	14m 14s
	5h 52m 51s

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