From Unit Tests to Whole Universe Tests (with Will Wilson)

How confident are you when your test suite goes green? If you're honest, probably not 100% confident - because most bugs come from scenarios we never thought to test. Traditional testing only catches the problems we anticipate, but the 3am pager alerts? Those come from the unexpected interactions, timing issues, and edge cases we never imagined.In this episode, Will Wilson from Antithesis takes us deep into the world of autonomous testing. They've built a deterministic hypervisor that can simulate entire distributed systems - complete with fake AWS services - and intelligently explore millions of possible states to find bugs before production. Think property-based testing, but for your entire infrastructure stack. The approach is so thorough they've even used it to find glitches in Super Mario Brothers (seriously).We explore how deterministic simulation works at the hypervisor level, why traditional integration tests are fundamentally limited, and how you can write maintainable tests that actually find the bugs that matter. If you've ever wished you could test "what happens when everything that can go wrong does go wrong," this conversation shows you how that's finally becoming possible.---Support Developer Voices on Patreon: https://patreon.com/DeveloperVoicesSupport Developer Voices on YouTube: https://www.youtube.com/@DeveloperVoices/joinAntithesis: https://antithesis.com/Antithesis testing with Super Mario: https://antithesis.com/blog/sdtalk/...and with Metroid: https://antithesis.com/blog/2025/metroid/MongoDB: https://www.mongodb.com/etcd (Linux Foundation): https://etcd.io/Facebook Hermit: https://github.com/facebookexperimental/hermitRR (Record-Replay Debugger): https://rr-project.org/T-SAN (Thread Sanitizer): https://clang.llvm.org/docs/ThreadSanitizer.htmlToby Bell's Strange Loop Talk on JPL Testing: https://www.youtube.com/results?search_query=toby+bell+strange+loop+jplAndy Weir - Project Hail Mary: https://www.goodreads.com/book/show/54493401-project-hail-maryAndy Weir - The Martian: https://www.goodreads.com/book/show/18007564-the-martianAntithesis Blog (Nintendo Games Testing): https://antithesis.com/blog/Kris on Bluesky: https://bsky.app/profile/krisajenkins.bsky.socialKris on Mastodon: http://mastodon.social/@krisajenkinsKris on LinkedIn: https://www.linkedin.com/in/krisjenkins/

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