fast-check Free plan 8.9 Visit Rapid
pgregory.net
Spec sheet
- What it does
- Rapid is a Go library for property-based testing that checks user-defined properties against automatically generated test cases.Read 3 Oct 2026 · github.com
- License
- Rapid is licensed under the Mozilla Public License Version 2.0.Read 3 Oct 2026 · github.com
- Automatic minimization
- When a failure is found, Rapid automatically minimizes the failing test case before presenting it.Read 3 Oct 2026 · github.com
- Comparison limit
- Compared with Go's testing.F.Fuzz, Rapid describes itself as better suited to structured data and state machine tests, while lacking coverage-guided feedback and mutations.Read 3 Oct 2026 · github.com
- Configuration
- Rapid's options can be set with flags prefixed -rapid. or corresponding RAPID_ environment variables.Read 3 Oct 2026 · github.com
- Data generation
- Its type-safe generators use generics and bias data generation toward small values and edge cases.Read 3 Oct 2026 · github.com
- Dependencies
- Rapid has no dependencies outside the Go standard library.Read 3 Oct 2026 · github.com
- Failure persistence
- Rapid supports persisting minimized failing test cases and automatically rerunning them.Read 3 Oct 2026 · github.com
- Fuzzing integration
- The MakeFuzz function lets a Rapid test be used as a fuzz target for Go's standard fuzzer.Read 3 Oct 2026 · github.com
- Stability
- The project says tests should continue to work across future releases with the same major version, subject to stated API-change exceptions.Read 3 Oct 2026 · github.com
- Stateful testing
- Rapid supports state machine testing.Read 3 Oct 2026 · github.com
- Usage
- Rapid tests run with the standard go test command.Read 3 Oct 2026 · github.com
Plans and prices
Rapid Free Open-source Go library · No dependencies outside the Go standard library Read 3 Oct 2026 · github.com
Where Specifiction places it
- Property-Based Testing Tools#18 of 287.1