Protocol 4.3Testing
Test Coverage
Checks for coverage reporting tools, upload services (Codecov), and threshold enforcement in CI.
You cannot improve what you do not measure. Coverage baselines help prioritize testing effort and prevent regression.
Incidents that failed this protocol
FastlyJun 2021civilizational
Single customer config change triggers global Fastly CDN outage
Test coverage: the latent bug was not exercised by Fastly's test suite despite affecting common customer configuration patterns.
OpenSSL ProjectApr 2014civilizational
CVE-2014-0160 — Heartbleed buffer over-read in OpenSSL TLS heartbeat
Test coverage: bounds-check coverage on the heartbeat extension was insufficient — the bug existed for 2 years undetected.
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