Discover the future of software from the people making it happen.Listen to some of the smartest developers we know talk about what they're working on, how they're trying to move the industry forward, and what you can learn from it. You might find the solution to your next architectural headache, pick up a new programming language, or just hear some good war stories from the frontline of technology.Join your host Kris Jenkins as we try to figure out what tomorrow's computing will look like the best way we know how - by listening directly to the developers' voices.
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.
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Antithesis: 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/hermit
RR (Record-Replay Debugger): https://rr-project.org/
T-SAN (Thread Sanitizer): https://clang.llvm.org/docs/ThreadSanitizer.html
Toby Bell's Strange Loop Talk on JPL Testing: https://www.youtube.com/results?search_query=toby+bell+strange+loop+jpl
Andy Weir - Project Hail Mary: https://www.goodreads.com/book/show/54493401-project-hail-mary
Andy Weir - The Martian: https://www.goodreads.com/book/show/18007564-the-martian
Antithesis Blog (Nintendo Games Testing): https://antithesis.com/blog/
Kris on Bluesky: https://bsky.app/profile/krisajenkins.bsky.social
Kris on Mastodon: http://mastodon.social/@krisajenkins
Kris on LinkedIn: https://www.linkedin.com/in/krisjenkins/