I just pushed a patch in the testing API to allow creation of dummy CSV files. I also removed the CSV files we already had in there for testing purpose. See commits d824bca892dbaca4448c6503d8e3b971ba1c1ffc and dcfafcc9242ef92a56d16e8cda5f7db070f5417b.

@VirgileFritsch : I think that you only need ids for your fetcher so take a look at what I did for the oasis test.