[FEM] Elmer: add support for 2D magnetodynamics

- adds the corresponding Elmer equation (it is now possible to do Elmer's tutorial example no. 16)

src/Mod/Fem/femtest/app/test_object.py

@@ -84,14 +84,14 @@ class TestObjectCreate(unittest.TestCase):
         # thus they are not added to the analysis group ATM
         # https://forum.freecadweb.org/viewtopic.php?t=25283
         # thus they should not be counted
-        # solver children: equations --> 6
+        # solver children: equations --> 7
         # gmsh mesh children: group, region, boundary layer --> 3
         # resule children: mesh result --> 1
         # post pipeline children: region, scalar, cut, wrap --> 4
         # analysis itself is not in analysis group --> 1
-        # thus: -14
+        # thus: -16
 
-        self.assertEqual(len(doc.Analysis.Group), count_defmake - 15)
+        self.assertEqual(len(doc.Analysis.Group), count_defmake - 16)
         self.assertEqual(len(doc.Objects), count_defmake)
 
         fcc_print("doc objects count: {}, method: {}".format(
@@ -366,6 +366,10 @@ class TestObjectType(unittest.TestCase):
             "Fem::EquationElmerHeat",
             type_of_obj(ObjectsFem.makeEquationHeat(doc, solverelmer))
         )
+        self.assertEqual(
+            "Fem::EquationElmerMagnetodynamic2D",
+            type_of_obj(ObjectsFem.makeEquationMagnetodynamic2D(doc, solverelmer))
+        )
 
         fcc_print("doc objects count: {}, method: {}".format(
             len(doc.Objects),
@@ -597,6 +601,10 @@ class TestObjectType(unittest.TestCase):
             ObjectsFem.makeEquationHeat(doc, solverelmer),
             "Fem::EquationElmerHeat"
         ))
+        self.assertTrue(is_of_type(
+            ObjectsFem.makeEquationMagnetodynamic2D(doc, solverelmer),
+            "Fem::EquationElmerMagnetodynamic2D"
+        ))
 
         fcc_print("doc objects count: {}, method: {}".format(
             len(doc.Objects),
@@ -1422,6 +1430,21 @@ class TestObjectType(unittest.TestCase):
             "Fem::EquationElmerHeat"
         ))
 
+         # EquationElmerMagnetodynamic2D
+        equation_magnetodynamic2D = ObjectsFem.makeEquationMagnetodynamic2D(doc, solver_elmer)
+        self.assertTrue(is_derived_from(
+            equation_magnetodynamic2D,
+            "App::DocumentObject"
+        ))
+        self.assertTrue(is_derived_from(
+            equation_magnetodynamic2D,
+            "App::FeaturePython"
+        ))
+        self.assertTrue(is_derived_from(
+            equation_magnetodynamic2D,
+            "Fem::EquationElmerMagnetodynamic2D"
+        ))
+
         fcc_print("doc objects count: {}, method: {}".format(
             len(doc.Objects),
             sys._getframe().f_code.co_name)
@@ -1706,6 +1729,12 @@ class TestObjectType(unittest.TestCase):
                 solverelmer
             ).isDerivedFrom("App::FeaturePython")
         )
+        self.assertTrue(
+            ObjectsFem.makeEquationMagnetodynamic2D(
+                doc,
+                solverelmer
+            ).isDerivedFrom("App::FeaturePython")
+        )
 
         fcc_print("doc objects count: {}, method: {}".format(
             len(doc.Objects),
@@ -1786,6 +1815,7 @@ def create_all_fem_objects_doc(
     ObjectsFem.makeEquationFlow(doc, sol)
     ObjectsFem.makeEquationFlux(doc, sol)
     ObjectsFem.makeEquationHeat(doc, sol)
+    ObjectsFem.makeEquationMagnetodynamic2D(doc, sol)
 
     doc.recompute()