def METHOD_NAME(self):
    # Cubes on similar but different meshes -- should *not* combine.
    mesh1 = sample_mesh()
    mesh2 = sample_mesh(n_edges=0)
    self.assertNotEqual(mesh1, mesh2)
    cube1 = sample_mesh_cube(mesh=mesh1)
    cube2 = sample_mesh_cube(mesh=mesh2)
    msg = "Mesh coordinate.* does not match"
    with self.assertRaisesRegex(ValueError, msg):
        cube1 + cube2