On fresh install (also visible during test initialization) you can have error/warning about the encryption key:
tests-1 | PHP Warning: chown(): No such file or directory in /usr/share/tuleap/src/common/Cryptography/KeyFactoryFromFileSystem.php on line 144
tests-1 | Impossible to chown /etc/tuleap/conf/encryption_secret.key to codendiadm
tests-1 | PHP Warning: chgrp(): No such file or directory in /usr/share/tuleap/src/common/Cryptography/KeyFactoryFromFileSystem.php on line 147
tests-1 | Impossible to chgrp /etc/tuleap/conf/encryption_secret.key to codendiadm