[TF-A] arm-trustedfirmware whether has unit test

hi,

I has quality engineer from china. I would to start study the Arm profile-A trustedfirmware and try to test it. I has read trustedfirmware documetion , From the Processes & policies Chap about CI part. "https://trustedfirmware-a.readthedocs.io/en/latest/process/contributing.html... " Find ATF has Coverity Scan and test image build. but I would to know, trustedfirmware-a whether has unit test part in the code level quality check.

Brs Tony