Merge branch 'fix/new-module-exercise' into 'master'

[ex][dunemodule] Use dumux_add_test

See merge request !193

exercises/exercise-dunemodule/README.md

@@ -52,10 +52,10 @@ mkdir appl
 
 ```cmake
 # add a new finite volume 1p test
-dune_add_test(NAME test_1p_compressible_stationary_tpfa
-              SOURCES main.cc
-              COMPILE_DEFINITIONS TYPETAG=OnePCompressibleTpfa
-              CMD_ARGS params.input)
+dumux_add_test(NAME test_1p_compressible_stationary_tpfa
+               SOURCES main.cc
+               COMPILE_DEFINITIONS TYPETAG=OnePCompressibleTpfa
+               CMD_ARGS params.input)
 
 # add a symlink for the input file
 dune_symlink_to_source_files(FILES "params.input")