FsCheck vs Rapid
FsCheck
fscheck.github.ioRapid
pgregory.netSide by side
| Figure | FsCheck | Rapid |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| Self-hosted | — | Yes |
| Plans published | 1 | 1 |
| Spec score · Property-Based Testing Tools | 8.4 (#3) | 7.1 (#18) |
| License | The project says its BSD license permits modification and redistribution for commercial and non-commercial purposes. | Rapid is licensed under the Mozilla Public License Version 2.0. |
| Stateful testing | Model-based testing for stateful systems and objects is in the Experimental namespace, where semantic-versioning promises do not apply. | Rapid supports state machine testing. |
Plans
In their own words
FsCheck
FsCheck checks properties of.NET programs against randomly generated cases. Developers can express properties in F#, C# or VB, then run them with the built-in runner from an interactive session, a command-line program or a test framework. Integrations are documented for xUnit.net and NUnit, with user-created integrations for Expecto, Fuchu, AutoFixture and MSTest. When a property fails, FsCheck shrinks the input and shows a minimal counterexample. Developers can also define custom generators and shrinkers and group them in Arbitrary instances. The library supports parameterized cases and parallel execution, and its packages and NUnit and xUnit.NET plugins are available from NuGet. FsCheck is free: its listed plan is free, with a BSD license permitting commercial and non-commercial modification and redistribution. It runs on Linux, macOS and Windows. The project maintains version 3.x, but its documentation covers 2.x and is described as out of date and incomplete. Its model-based testing API is experimental and exempt from semantic-versioning guarantees.