Throw when trying to instantiate a post.Mesh with a None as MeshedRegion

Author: PProfizi

src/ansys/dpf/post/mesh.py

@@ -27,6 +27,8 @@ class Mesh:
 
     def __init__(self, meshed_region: dpf.MeshedRegion):
         """Initialize this class."""
+        if meshed_region is None:
+            raise ValueError("Tried to instantiate an empty Mesh.")
         self._meshed_region = meshed_region
 
     def __str__(self):

tests/test_mesh.py

@@ -1,8 +1,9 @@
 import ansys.dpf.core as dpf
 import numpy as np
+import pytest
 from pytest import fixture
 
-from ansys.dpf.post import StaticMechanicalSimulation
+from ansys.dpf.post import Mesh, StaticMechanicalSimulation
 
 
 @fixture
@@ -14,6 +15,8 @@ def mesh(static_rst):
 def test_mesh_core_object(mesh):
     assert isinstance(mesh._core_object, dpf.MeshedRegion)
     assert mesh._core_object.nodes.n_nodes == 81
+    with pytest.raises(ValueError, match="Tried to instantiate an empty Mesh."):
+        _ = Mesh(None)
 
 
 def test_mesh_node_ids(mesh):