Using set_tests_properties for setting or unsetting multiple variables

Ah, I see. I’d have struggled to work that out from the documentation, but yes this works on both platforms:

add_test(NAME SimplePythonTest
         COMMAND ${CMAKE_COMMAND} -E env --unset=PYTHONHOME --unset=PYTHONPATH  ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_LIST_DIR}/SimpleTest.py 
         WORKING_DIRECTORY ${my_home})

Thank you.