[test] Add test with nonoverlapping grid manager that cannot communicate

test/porousmediumflow/1p/incompressible/CMakeLists.txt

@@ -145,3 +145,11 @@ dumux_add_test(NAME test_1p_incompressible_mpfa_extrude_distorted
                                     -Problem.CheckIsConstantVelocity true
                                     -Problem.EnableGravity false
                                     -Grid.File ./grids/randomlydistorted.dgf)
+
+# check grids without communicate method (using box and numeric differentiation)
+dumux_add_test(NAME test_1p_incompressible_box_numdiff_no_communicate
+               LABELS porousmediumflow 1p
+               SOURCES main.cc
+               COMPILE_DEFINITIONS TYPETAG=OnePIncompressibleBox NUMDIFFMETHOD=DiffMethod::numeric GRIDTYPE=Dumux::NoCommunicateGrid<2>
+               COMMAND ./test_1p_incompressible_box_numdiff_no_communicate
+               CMD_ARGS -Grid.Overlap 0)

test/porousmediumflow/1p/incompressible/main.cc

@@ -149,6 +149,9 @@ int main(int argc, char** argv)
     // output result to vtk
     vtkWriter.write(1.0);
 
+    // output residual norm (test assembler interface)
+    std::cout << "Residual norm: " << assembler->residualNorm(x) << std::endl;
+
     timer.stop();
 
     const bool checkIsConstantVelocity = getParam<bool>("Problem.CheckIsConstantVelocity", false);

test/porousmediumflow/1p/incompressible/properties.hh

@@ -50,6 +50,67 @@
 #define GRIDTYPE Dune::YaspGrid<2>
 #endif
 
+////////////////////////////////////////////////////
+// A fake grid that cannot communicate.           //
+// Can be used to make sure that compilation and  //
+// sequential execution also work for such grids. //
+////////////////////////////////////////////////////
+namespace Dumux {
+
+template<int dim>
+class NoCommunicateGrid;
+
+template<int dim>
+class NoCommunicateGridLeafGridView
+: public Dune::YaspGrid<dim>::LeafGridView
+{
+    using ParentType = typename Dune::YaspGrid<dim>::LeafGridView;
+public:
+    using ParentType::ParentType;
+
+    struct Traits : public ParentType::Traits
+    { using Grid = NoCommunicateGrid<dim>; };
+};
+
+template<int dim>
+class NoCommunicateGrid : public Dune::YaspGrid<dim>
+{
+    using ParentType = Dune::YaspGrid<dim>;
+public:
+    using ParentType::ParentType;
+    struct Traits : public ParentType::Traits
+    { using LeafGridView = NoCommunicateGridLeafGridView<dim>; };
+
+    using LeafGridView = NoCommunicateGridLeafGridView<dim>;
+
+    typename Traits::LeafGridView leafGridView() const
+    { return NoCommunicateGridLeafGridView<dim>(*this); }
+private:
+    using ParentType::communicate;
+    using ParentType::communicateCodim;
+};
+
+template<int dim>
+class GridManager<NoCommunicateGrid<dim>> : public GridManager<Dune::YaspGrid<dim>>
+{
+    using ParentType = GridManager<Dune::YaspGrid<dim>>;
+public:
+    using ParentType::ParentType;
+    using Grid = NoCommunicateGrid<dim>;
+    Grid& grid() { return static_cast<NoCommunicateGrid<dim>&>(ParentType::grid()); }
+};
+
+} // end namespace Dumux
+
+namespace Dune::Capabilities {
+
+template<int dim, int codim>
+struct canCommunicate<Dumux::NoCommunicateGrid<dim>, codim>
+{ static constexpr bool v = false; };
+
+} // end namespace Dune::Capabilities
+/////////////////////////////////////////
+
 namespace Dumux::Properties {
 // Create new type tags
 namespace TTag {