Gopter vs Rantly
Gopter
github.comRantly
github.comSide by side
| Figure | Gopter | Rantly |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Linux | Yes | — |
| Self-hosted | Yes | Yes |
| Plans published | 2 | 1 |
| Spec score · Property-Based Testing Tools | 8.6 (#2) | 7.3 (#17) |
| License | The repository identifies Gopter as MIT licensed. | The project code is published under the MIT License. |
| Purpose | Gopter is a Go property-testing library that brings ideas from ScalaCheck and QuickCheck to Go. | Rantly generates random test data and provides a Test::Unit extension for property-based testing. |
| Shrinking | Its shrinkers automatically seek a minimum value that falsifies a property. | Optional shrinking can reduce failing values; the documented search is limited to at most 1024 shrinking operations and does not fully traverse the failure tree. |
Plans
In their own words
Gopter
Gopter is a free Go module for property-based testing. It creates properties from conditions and generated inputs, then checks whether those properties hold. Its generators provide more control than Go's testing/quick package and can be composed with operations such as Map, FlatMap, SuchThat, and WithShrinker. When a property fails, shrinkers seek a smaller value that still demonstrates the failure. Gopter also includes a generator for regular-expression matches and supports stateful tests based on arbitrary commands. Properties can run with Go's testing.T through TestingRun, and the gopter/convey package provides helpers for using Gopter inside GoConvey tests. Console and formatted reporters present test results. The project declares Go 1.20 and is distributed under the MIT License. Its documentation covers the gopter, gen, prop, arbitrary, commands, and convey packages. The README identifies two omissions: ScalaCheck's Pretty feature is not provided, and parallel commands are not available yet.