test: add tests for FMIComponent

Author: AayushSabharwal

test/extensions/Project.toml

@@ -2,6 +2,8 @@
 BifurcationKit = "0f109fa4-8a5d-4b75-95aa-f515264e7665"
 ChainRulesCore = "d360d2e6-b24c-11e9-a2a3-2a2ae2dbcce4"
 ChainRulesTestUtils = "cdddcdb0-9152-4a09-a978-84456f9df70a"
+FMI = "14a09403-18e3-468f-ad8a-74f8dda2d9ac"
+FMIZoo = "724179cf-c260-40a9-bd27-cccc6fe2f195"
 ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 HomotopyContinuation = "f213a82b-91d6-5c5d-acf7-10f1c761b327"
 InfiniteOpt = "20393b10-9daf-11e9-18c9-8db751c92c57"

test/extensions/fmi.jl

@@ -0,0 +1,19 @@
+using ModelingToolkit, FMI, FMIZoo, OrdinaryDiffEq
+using ModelingToolkit: t_nounits as t, D_nounits as D
+import ModelingToolkit as MTK
+
+@testset "Standalone pendulum model" begin
+    @testset "v2, ME" begin
+        fmu = loadFMU("SpringPendulum1D", "Dymola", "2022x"; type = :ME)
+        @mtkbuild sys = MTK.FMIComponent(Val(2), Val(:ME); fmu)
+        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
+        # repeated solve works
+        @test_nowarn solve(prob, Tsit5())
+    end
+end

test/runtests.jl

@@ -114,6 +114,7 @@ end
 
     if GROUP == "All" || GROUP == "Extensions"
         activate_extensions_env()
+        @safetestset "FMI Extension Test" include("extensions/fmi.jl")
         @safetestset "HomotopyContinuation Extension Test" include("extensions/homotopy_continuation.jl")
         @safetestset "Auto Differentiation Test" include("extensions/ad.jl")
         @safetestset "LabelledArrays Test" include("labelledarrays.jl")