Merge branch 'master' of https://github.com/wwu-numerik/dune-stuff into dune-testtools

dune/stuff/test/grid_provider.hh

@@ -42,6 +42,8 @@
 
 #endif // HAVE_ALUGRID
 
+#include "gtest/gtest.h"
+
 template <class GridProviderType>
 class ConstGridProviderBase : public testing::Test
 {