Gopter vs SwiftCheck
Gopter
github.comSwiftCheck
github.comSide by side
| Figure | Gopter | SwiftCheck |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| macOS | — | Yes |
| Linux | Yes | — |
| iOS | — | Yes |
| Self-hosted | Yes | — |
| Plans published | 2 | 0 |
| Spec score · Property-Based Testing Tools | 8.6 (#2) | 6.5 (#27) |
| Generators | It provides tighter control over generators than Go's testing/quick package. | The library provides generator combinators for choosing values, filtering generated values, and composing generators. |
| License | The repository identifies Gopter as MIT licensed. | SwiftCheck is released under the MIT license. |
| Property testing | It creates properties from condition functions and generated inputs. | Its `forAll` quantifier lets tests express properties that should hold across generated inputs. |
| Purpose | Gopter is a Go property-testing library that brings ideas from ScalaCheck and QuickCheck to Go. | SwiftCheck is a Swift testing library that automatically generates random data to test program properties. |
| Shrinking | Its shrinkers automatically seek a minimum value that falsifies a property. | When a generated test case fails, SwiftCheck reduces the data toward a minimal counterexample. |
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.