This repository has a script that can be used to generate some random files with using some random content. The files can be compressed or not and can either be created splited between one or more buckets. In this case, if you have decided to comprees the output the whole directory will be compressed with all files within.
After you have downloaded the script and installed the dependencies, just type the following command to get a help about the possible arguments:
python
create_csv_files.py --help