Writing
Writing
Notes on testing, developer tools, and what we find building Flawd and Lash.
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We mutation-tested 10 popular open-source projects across five languages
Celery, Ghost, Traefik, Vector, Prisma and five others, mutated thousands of times to see what their test suites actually catch. Verified scores ran from 72.6 to 100 percent. The misses, and what it took to trust these numbers, are the interesting part.