Developer Tests a Recovery Script Branch That Had Never Once Fired in Production

A developer maintaining a DEV.to publishing pipeline discovered that a shell script written to fix a recurring detached HEAD git bug had always followed its success path, never once triggering its error branch. The script, run at the start of every session since mid-July, fast-forwards the main branch onto a detached commit when that commit is a clean descendant of main. Because the pipeline runs sequentially with no concurrent sessions or force-pushes, a genuine divergence was structurally impossible in normal operation. To verify the untested error branch, the developer deliberately reproduced the divergence scenario in a throwaway scratch repository, confirming the script exited correctly with the expected error message. The exercise highlighted a broader code-review concern: guard clauses that look correct on paper but are never actually exercised because the surrounding system prevents the condition from occurring.