The fountain website has some good files for reviewing formatting difference between fountain, fdx and PDF. Some are referenced in the test programs but they are optional. It is not clear to me the licensing arrangements for the text so I have not included them in this repository.
If you want to include them in the test sequence go to the fountain website and
download them and place them in the testdata directory. When you
run go test they will be found and included in the basic test process.