See (thanks to Uwe for the link):
https://github.com/reutenauer/polyglossia/commit/
ccb0e9e2c6411170ad779b05ff5076f1193cc323
We thus invert the LuaTeX Farsi tests.
All inverted tests now have explanations for why they are not
currently expected to work.
export/templates/ectaart_pdf5
export/templates/ectaart_dvi3
#
+# LuaTeX does not support Farsi yet. See:
+# https://github.com/reutenauer/polyglossia/commit/ccb0e9e2c6411170ad779b05ff5076f1193cc323
export/examples/fa/splash_pdf5
+export/examples/fa/splash_dvi3