Side by side
Proptest vs StreamData
Both stand on property-based testing tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Web
Proptest provides property-based testing, failure shrinking and state-machine support for Rust at no cost. Its maintenance model and experimental or partial support for some targets are worth weighing before adoption.
Visit Proptest Free plan API
Choose StreamData if you write Elixir tests with ExUnit and want generated inputs, shrinking, and reproducible failures. Look elsewhere if your property-based tests need stateful testing or saved counter-examples.
Visit StreamDataThe facts
| Proptest | StreamData | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Web | API |
| Lowest paid plan | Not published | Free or on request |
| Plans published | None | 1 |
| Maker | Not published | Not published |
| Website | proptest-rs.github.io | github.com |
| On property-based testing tools | #19 of 28 | #23 of 28 |
Proptest: what it does well
- Automatically minimizes failing test cases.
- Persists failures for replay in later runs.
- Supports state-machine testing.
- Includes optional subprocess forking and timeouts.
- Available under Apache-2.0 and MIT licenses.
What to know first
- Maintained mainly through passive volunteer maintenance.
- Partial no_std support requires a nightly compiler.
- WebAssembly support is highly experimental.
- WebAssembly lacks i128 and u128 numeric strategies.
StreamData: what it does well
- Combines generators to create custom data generators.
- Generators can also produce streams of random data.
- Shrinks failing values toward simpler examples.
- Reproduce failures by reusing the original seed.
- Free under the Apache License 2.0.
What to know first
- Does not support stateful property-based testing.
- Does not save counter-examples to a file.
Alternatives to Proptest Alternatives to StreamData The whole list