[affine] add a (failing to build) minimal test for an affine function

dune/xt/functions/test/affine.cc

+// This file is part of the dune-xt-functions project:
+//   https://github.com/dune-community/dune-xt-functions
+// Copyright 2009-2017 dune-xt-functions developers and contributors. All rights reserved.
+// License: Dual licensed as BSD 2-Clause License (http://opensource.org/licenses/BSD-2-Clause)
+//      or  GPL-2.0+ (http://opensource.org/licenses/gpl-license)
+//          with "runtime exception" (http://www.dune-project.org/license.html)
+// Authors:
+//   Felix Schindler (2013 - 2017)
+//   Rene Milk       (2013 - 2016)
+//   Tobias Leibner  (2014 - 2016)
+
+#include <dune/xt/common/test/main.hxx>
+
+#include <memory>
+
+#include <dune/xt/common/exceptions.hh>
+#include <dune/xt/grid/grids.hh>
+#include <dune/xt/grid/gridprovider/cube.hh>
+#include <dune/xt/functions/affine.hh>
+
+#include <dune/xt/functions/test/functions.hh>
+
+using namespace Dune;
+using namespace Dune::XT;
+using namespace Dune::XT::Functions;
+
+/* we just take the constant function as a container for the types we need */
+/* since this one always exists for all combinations */
+struct FunctionsTest //: public FunctionTest<TESTFUNCTIONTYPE>
+{
+  virtual void check() const
+  {
+    auto grid = XT::Grid::make_cube_grid<GRIDTYPE>();
+    const auto testfunction = TESTFUNCTIONTYPE::create();
+    for (auto&& entity : elements(grid.leaf_view())) {
+      auto xx_global = entity.geometry().center();
+      auto xx_local = entity.geometry().local(xx_global);
+      TESTFUNCTIONTYPE::JacobianRangeType jacobian;
+      testfunction->local_function(entity)->jacobian(xx_local);
+    }
+  }
+};

dune/xt/functions/test/affine.mini

+__name = functions
+__exec_suffix = {gridname}_{dimDomain}d_r{dimRange}_rc{dimRangeCols}
+
+dimRange = 1, 3 | expand
+dimRangeCols = 1, 3 | expand
+
+include grids.mini
+
+[__static]
+GRIDTYPE = {grid}
+TESTFUNCTIONTYPE = Dune::XT::Functions::AffineFunction<{entity_type}, double, {dimDomain}, double, {dimRange}, {dimRangeCols}>

dune/xt/functions/test/functions.cc

@@ -16,6 +16,7 @@
 #include <dune/xt/common/exceptions.hh>
 #include <dune/xt/grid/grids.hh>
 #include <dune/xt/functions.hh>
+#include <dune/xt/common/test/gtest/gtest.h>
 
 #include "functions.hh"
 
@@ -42,3 +43,8 @@ struct FunctionsTest : public FunctionTest<TESTFUNCTIONTYPE>
     }
   }
 };
+
+TEST_F(FunctionsTest, creation_and_evalution)
+{
+  this->check();
+}