PropCheck vs StreamData
PropCheck
github.comStreamData
github.comSide by side
| Figure | PropCheck | StreamData |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Linux | Yes | — |
| API | — | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Property-Based Testing Tools | 8.0 (#7) | 7.0 (#23) |
| Generators | It includes generators for common Ruby data types and a DSL for defining custom generators. | It provides generators and functions for combining them into custom generators. |
| Installation | The README says to add `gem 'prop_check'` to a Gemfile or install it with `gem install prop_check`. | The README instructs users to add the stream_data dependency and run mix deps.get. |
| License | The project is released under the MIT License. | The repository README identifies the license as Apache License 2.0. |
| Purpose | PropCheck is a Ruby library for property-based testing that checks assertions against generated inputs. | StreamData is an Elixir library for data generation and property-based testing. |
| Shrinking | When a generated case fails, PropCheck attempts to simplify it to a minimal counterexample. | Generators can shrink failing values toward simpler examples to make property test failures easier to understand and reproduce. |
Plans
In their own words
PropCheck
PropCheck is a Ruby library for property-based testing: it generates inputs and checks whether assertions hold across them. When a generated example fails, it tries to simplify that case into a smaller counterexample. Built-in generators cover integers, floats, strings, symbols, arrays, hashes, sets, dates, times and datetimes. A generator DSL lets developers define their own, while the API also supports mapping and binding values, alternatives and weighted frequency choices.
Before, after and around hooks provide setup and cleanup around generated examples. The README gives usage examples for RSpec, MiniTest, test-unit and vanilla Ruby, and says the library has no external dependencies. PropCheck requires Ruby 2.5.1 or later and is released under the MIT License. It is available as a free Community library. Installation can be done through a Gemfile or with `gem install prop_check`. For generated examples involving a database, the README recommends cleaning database state around each example and mentions DatabaseCleaner. Stateful property testing is described as a possible future separate add-on.