EDIT: I think I had something wrong on the logging.basicConfig() because now is creating the .log file when running that line and then the ic() is writing correctly on the log file.
Edit 2: I found what was happening, I was using another directory and now found the og log file with all the tests that were supposed lost.
Thanks for your help.
logger.debug('test') created the log file and logged test, after that ic('test') wrote correctly on the log file.
Restating the kernel and running again directly with ic('test') it wrote on the already existing log file.
So, to recap. If the .log file doesn't exists, ic() didn't create the file and nothing is logged, if the the log file already exists, then the ic() wrote correctly on the log file.
The only missing part is how to create the log file without needing of the logger.debub('').
Tried to create an empty log file with open('logfile.log', 'a').close() and the log file is created but is useless (dosen't even write the logger.debug('test') output)