Event

Property-Based Testing for Web Applications, Antithesis webinar (on demand)

When

first aired Thursday, 2026-10-29 (from the newsletter; time not stated on any page)

Where

online; on demand

Speakers

Hillel Wayne (Developer Educator, Antithesis). The registration page also lists Somtochi Onyekwere (Staff Software Engineer, Fly.io); the on-demand page does not.

Links

On-demand page; Registration page (titled "Intro to Property-Based Testing for Web Applications"); Hillel Wayne's newsletter, 2026-10-22

Every action a user can take is another chance to break a data constraint, and another test to write; the page asks what it would take to need only one. Hillel Wayne introduces property-based testing as a way to check that constraints hold no matter what your users do. The focus is CRUD apps, but the page says the ideas apply anywhere a "bad thing" must not happen.

The on-demand page lists four takeaways (two further slots are placeholders):

• what system properties and data invariants are, and how to find the invariants in your system;
• writing tests that check whether any sequence of user actions breaks an invariant, and the open-source tools that support this;
• where property testing fits in an overall testing strategy;
• simple signals that show whether the strategy is working.

The registration page lists the first three.

From the newsletter: the interesting part is that it is about property testing web applications, with the emphasis on state-based system invariants rather than algebraic laws and round-trip properties. A footnote says it mentions some Antithesis projects but covers open-source tooling and does not pitch paid products.

• Fuzzing your GUI for property perfection with Bombadil (Antithesis live demo, 2026-11-12), where Adrian Hatch mentioned this webinar.
• Introduction to property-based testing (Alperen Keles, 2026-08-10, with transcript): the page calls itself the first installment of a course on property-based testing. It does not mention this webinar or Hillel Wayne, so no series link between the two is claimed here.