Fix unit tests due to a missing plugin [Mapping] (#463)

* fix unit tests due to missing plugin

* fix python unit test due to missing plugin

Author: fredroy

bindings/Modules/tests/SofaConstraintSolver/matrix_access.py

@@ -14,6 +14,7 @@ def simulate_pendulum(self):
                                                      "Sofa.Component.Constraint.Projective",
                                                      "Sofa.Component.IO.Mesh",
                                                      "Sofa.Component.LinearSolver.Direct",
+                                                     "Sofa.Component.Mapping.NonLinear",
                                                      "Sofa.Component.Mapping.MappedMatrix",
                                                      "Sofa.Component.Mass",
                                                      "Sofa.Component.ODESolver.Backward",

bindings/Sofa/tests/Core/BaseLink.py

@@ -8,6 +8,7 @@ def create_scene(rootName="root"):
     root = Sofa.Core.Node(rootName)
     root.addObject("RequiredPlugin", name="Sofa.Component.StateContainer")
     root.addObject("RequiredPlugin", name="Sofa.Component.SolidMechanics.Spring")
+    root.addObject("RequiredPlugin", name="Sofa.Component.Mapping.Linear")
     return root
 
 class Test(unittest.TestCase):

bindings/Sofa/tests/Simulation/Node.py

@@ -285,6 +285,7 @@ def test_getMechanicalState(self):
         def test_getMechanicalMapping(self):
             root = Sofa.Core.Node("root")
             root.addObject("RequiredPlugin", name="Sofa.Component.StateContainer")
+            root.addObject("RequiredPlugin", name="Sofa.Component.Mapping.Linear")
             root.addObject("MechanicalObject", name="t1")
             root.addObject("MechanicalObject", name="t2")
             mm  = root.addObject("BarycentricMapping", input="@/t1", output="@/t2")