fixup! test: add tests for FMIComponent

Author: AayushSabharwal

test/extensions/fmi.jl

@@ -9,6 +9,7 @@ import ModelingToolkit as MTK
         prob = ODEProblem{true, SciMLBase.FullSpecialize}(
             sys, [sys.mass__s => 0.5, sys.mass__v => 0.0], (0.0, 8.0))
         sol = solve(prob, Tsit5(); reltol = 1e-8, abstol = 1e-8)
+        @test SciMLBase.successful_retcode(sol)
 
         truesol = FMI.simulate(fmu, (0.0, 8.0); saveat = 0.0:0.1:8.0)
         @test sol(0.0:0.1:8.0).u≈truesol.states.u atol=1e-4