Several parts of the code in api_test_runner.py returned 1 on failure. While common for main() functions, this is bad in functions that are expected to return something else than an exit code, and lets the program run after the error. sys.exit(1) should be used in those cases instead.
Created attachment 418146 [details] Patch
Committed r271789: <https://trac.webkit.org/changeset/271789> All reviewed patches have been landed. Closing bug and clearing flags on attachment 418146 [details].
<rdar://problem/73564098>