Eris vs JSVerify
Eris
github.comJSVerify
jsverify.github.ioSide by side
| Figure | Eris | JSVerify |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 0 | 1 |
| Spec score · Property-Based Testing Tools | 7.6 (#12) | 8.1 (#5) |
| Installation | The README gives Composer as the installation method and shows the command composer require --dev giorgiosironi/eris. | The project README instructs users to install the module with npm install jsverify. |
| License | The repository identifies the project as MIT licensed. | The GitHub repository identifies the project license as MIT. |
| Maintainer | The project documentation credits Giorgio Sironi. | The official site says the project is maintained by phadej. |
| Purpose | Eris brings QuickCheck-style property-based testing to PHP and PHPUnit. | JSVerify is a property-based testing library for JavaScript, inspired by QuickCheck. |
| Reproducibility | When Eris is used outside PHPUnit, the documentation says reproducibility can be obtained by setting the ERIS_SEED environment variable. | The README says test runs can be reproduced using a particular random generator state. |
Plans
In their own words
JSVerify
JSVerify is a free, open-source property-based testing library for JavaScript, inspired by QuickCheck. It generates inputs and checks whether a stated property holds across them. When a check fails, it attempts to shrink the generated input into a smaller counterexample. Properties can return Promises, allowing asynchronous methods to be tested. JSVerify is framework agnostic; the project names Mocha, nodeunit, and Jasmine as examples. The README instructs users to install it with `npm install jsverify` and says TypeScript typings are provided, though TypeScript specs cannot use the type DSL. Documented defaults are 100 tests and a maximum generated-value size of 50. Options cover test count, maximum generated size, quiet output, and random generator state. Generated values are deterministic when using primitives from the random module, and the RNG state can be set. The project is maintained by phadej and licensed under MIT. Its official site points to the GitHub README for API and usage documentation. The README cautions that exposed utility functions may change incompatibly, including in patch releases.