Quora has taken code quality very seriously.
And yes, it was setup for CD pretty much near the beginning.
commit 9bcf5be94a6ce3efac5fda8de342a476af52d231 Author: Adam D'Angelo <dangelo@ugcs.caltech.edu> Date: Tue May 19 15:28:20 2009 -0700
autotest work
add after_git_update.py