The Rust community recently approved a Custom Test Frameworks eRFC which lays out a series of goals and possible directions of exploration for implementing custom test frameworks. In this post, I present my own proposed fulfillment of the RFC with rationale.

I recently set out to fix a bug in #[test] expansion in Rust. What follows is a chronicle of that journey.

Lately, I’ve been working implementing the Custom Test Frameworks eRFC for Rust. While exploring the compiler codebase, I’ve learned about the internals of testing in Rust and figured it would be interesting to share.