rspec

1.2K downloads in the last 30 days (39/day), up 65% from the previous period.

485 crates depend on rspec. Reasonable ecosystem adoption, though not yet a core dependency.

The API has been stable (1.x) for over 9 years with 6 releases. This level of maturity means you can depend on it without worrying about breaking changes.

At 31KB, rspec is lightweight. Small crate size correlates with focused, well-scoped functionality.

Notable dependents include colored, publicsuffix, psl, addr, derive-error. When high-quality crates choose rspec, it's a strong quality signal.