More tests

Author: AnHeuermann

test/characteristic_ideal_diodes.jl

@@ -0,0 +1,18 @@
+@testset "CharacteristicIdealDiodes simulation (algebraic unknowns)" begin
+    # This model has unknowns but all are algebraic (zero mass-matrix rows).
+    # Regression test: Rodas5Pr returned Unstable when the saveat-grid fix
+    # was only applied to models with no unknowns at all.
+    model    = "Modelica.Electrical.Analog.Examples.CharacteristicIdealDiodes"
+    bmo_path = joinpath(FIXTURES, "$model.bmo")
+    mktempdir() do tmpdir
+        par_ok, _, par_err, ode_prob = run_parse(bmo_path, tmpdir, model)
+        @test par_ok
+        par_ok || @warn "Parse error: $par_err"
+
+        if par_ok
+            sim_ok, _, sim_err, _ = run_simulate(ode_prob, tmpdir, model)
+            @test sim_ok
+            sim_ok || @warn "Simulation error: $sim_err"
+        end
+    end
+end