enable embed test by providing the run-in-dune-env as COMMAND option to test

dune/python/test/CMakeLists.txt

@@ -6,8 +6,11 @@ dune_python_add_test(NAME pythontests
 dune_add_test(SOURCES test_embed1.cc
               LINK_LIBRARIES ${DUNE_LIBS} ${Python3_LIBRARIES}
               LABELS quick
-              )
+              COMMAND ${CMAKE_BINARY_DIR}/run-in-dune-env
+)
 
+# add_executable(test_embed1 EXCLUDE_FROM_ALL test_embed1.cc)
+# target_link_libraries(test_embed1 PUBLIC ${DUNE_LIBS} ${Python3_LIBRARIES})
 add_executable(test_embed2 EXCLUDE_FROM_ALL test_embed2.cc)
 target_link_libraries(test_embed2 PUBLIC ${DUNE_LIBS} ${Python3_LIBRARIES})
 # the following should apparently work but doesn't target_link_libraries(test_embed2 PRIVATE Python3::Python)