Latest changes in dune_add_test break build of dune-grid.
The ci for dune-grid gives this error now: CMake Error at /duneci/modules/dune-common/cmake/modules/DuneTestMacros.cmake:307 (_add_test): _add_test given test NAME "test-parallel-ug" which already exists in this directory.
Those who are responsible for this should take care of it immediately.