Green suites that hid holes: fleet gates that plant failure
I have shipped test suites that were green for the life of a repo and still left a hole on the LAN. By green I mean the dashboard color everyone treats as “safe to ship” — the check passed, the badge is cheerful, nobody is paging. CI (continuous integration) is the automated check-runner that usually paints that color: on every push or pull request it runs a suite of tests and jobs, then reports pass or fail. Green CI is valuable when it asked the hard questions. It is dangerous when it only asked the easy ones, or never ran the suite that looked like coverage. ...