[test.stationary...] minor updates

dune/gdt/test/stationary-eocstudies/base.hh

@@ -18,6 +18,7 @@
 #include <dune/grid/io/file/dgfparser/dgfparser.hh>
 
 #include <dune/xt/common/convergence-study.hh>
+#include <dune/xt/common/test/common.hh>
 #include <dune/xt/common/fvector.hh>
 #include <dune/xt/common/string.hh>
 #include <dune/xt/common/timedlogging.hh>

dune/gdt/test/stationary-heat-equation/ESV2007.hh

@@ -47,7 +47,7 @@ struct ESV2007DiffusionProblem
 
   // We can only reproduce the results from ESV2007 by using a quadrature of order 3, which we obtain with a p1 DG space
   // and a force of order 2.
-  ESV2007DiffusionProblem(int force_order = DXTC_TEST_CONFIG_GET("setup.force_order", 2))
+  ESV2007DiffusionProblem(int force_order = 2)
     : diffusion_factor(1)
     , diffusion_tensor(XT::LA::eye_matrix<XT::Common::FieldMatrix<double, d, d>>(d, d))
     , dirichlet(0)
@@ -55,7 +55,7 @@ struct ESV2007DiffusionProblem
     , force(force_order)
   {}
 
-  XT::Grid::GridProvider<G> make_initial_grid()
+  XT::Grid::GridProvider<G> make_initial_grid() const
   {
     if (std::is_same<G, YASP_2D_EQUIDISTANT_OFFSET>::value) {
       return XT::Grid::make_cube_grid<G>(-1, 1, 8);
@@ -107,7 +107,7 @@ class ESV2007DiffusionTest : public StationaryDiffusionIpdgEocStudy<G>
 public:
   ESV2007DiffusionTest()
     : BaseType()
-    , problem()
+    , problem(DXTC_TEST_CONFIG_GET("setup.force_order", 2))
   {}
 
 protected:

dune/gdt/test/stationary-heat-equation/OS2015.hh

@@ -56,7 +56,7 @@ struct OS2015MultiscaleProblem
              /*second_domain_with_negative_value=*/{{{4.25, 4.4}, {0.25, 0.4}}, -1e3}})
   {}
 
-  XT::Grid::GridProvider<G> make_initial_grid()
+  XT::Grid::GridProvider<G> make_initial_grid() const
   {
     if (std::is_same<G, YASP_2D_EQUIDISTANT_OFFSET>::value) {
       return XT::Grid::make_cube_grid<G>({0., 0.}, {5., 1.}, {100u, 20u});