[test/factory] handle broken ALUgrid behaviour with non-default comms

dune/xt/grid/gridprovider/factory.hh

@@ -90,6 +90,10 @@ public:
                                                const Common::Configuration config = Common::Configuration(),
                                                MPIHelper::MPICommunicator mpi_comm = MPIHelper::getCommunicator())
   {
+    if (is_alugrid<GridType>::value && mpi_comm != MPIHelper::getCommunicator()) {
+      DUNE_THROW(InvalidStateException,
+                 "Alugrid either ignores, or outright fails with non-world comes when used here");
+    }
     if (CubeType::static_id() == type)
       return call_create<CubeType>(config, mpi_comm);
     else if (DgfType::static_id() == type)
@@ -161,6 +165,11 @@ public:
          const Common::Configuration config = Common::Configuration(),
          MPIHelper::MPICommunicator mpi_comm = MPIHelper::getCommunicator())
   {
+    if (is_alugrid<GridType>::value && mpi_comm != MPIHelper::getCommunicator()) {
+      DUNE_THROW(InvalidStateException,
+                 "Alugrid either ignores, or outright fails with non-world comes when used here");
+    }
+
     if (CubeType::static_id() == type)
       return call_create<CubeType>(config, mpi_comm);
     else if (available().empty())

dune/xt/grid/test/mpi_grid.tpl

@@ -27,7 +27,7 @@ GTEST_TEST(GridProvider_{{name}}, layers)
   MPI_Comm split_comm;
   MPI_Comm_split(MPI_COMM_WORLD, world_rank, world_rank, &split_comm);
 
-  {% if "cube" in type or "UGGrid" in type %}
+  {% if "ALU" in type or "UGGrid" in type %}
     // uggrid + alu cube grids cannot handle non-default comms
     EXPECT_THROW(ProviderFactory::create(config, split_comm), Dune::InvalidStateException);
     return;

python/dune/xt/grid/grids.bindings.hh

@@ -109,7 +109,7 @@ struct grid_name<ALUGrid<dim, dim, cube, conforming, Comm>>
 
 
 // not optimal
-template<int dim, int dimworld, ALU3dGridElementType elType, class Comm>
+template <int dim, int dimworld, ALU3dGridElementType elType, class Comm>
 struct grid_name<ALU3dGrid<dim, dimworld, elType, Comm>>
 {
   static std::string value()