· 6 min read
What We Learned Running 10,000 Property-Based Tests Against a Calendar Engine
Property-based testing caught DST double-counting, leap year edge cases, and RRULE bugs that unit tests missed. Here's our proptest setup.
· 4 min read
Introducing the Truth Engine: Deterministic RRULE Expansion
Why we built a Rust-based RRULE expansion library with 9,000+ property-based tests — and why AI agents need it.