pyo3-testing 0.3.0

Simplified testing for pyo3-wrapped functions
Documentation 
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# pyo3-testing: A crate to make testing pyo3 wrapped functions easy in rust

Pyo3-testing is designed to save the need to continually build and install your wrapped extension modules in order to run integration tests in python.

It provides a test attribute `#[pyo3test]` which allows you to shorten your tests to:

```rust
#[pyo3test]
#[pyo3import(py_adders: from adders import addone)]
fn test_pyo3test_simple_case() {
    let result: isize = addone!(1);
    assert_eq!(result, 2);
}
```

Without `pyo3-testing` this test can run to over 20 lines of code and randomly fail due to issues with python interpreter pre-initialisation.

For a walk-through guide to using the crate along with lots of other tips on developing rust extensions for python see: [Combining rust & python - a worked example](https://musicalninjadad.github.io/FizzBuzz)

Technical documentation for the crate is available at [docs.rs](https://docs.rs/pyo3-testing)

## Recognition

This crate wouldn't be possible or necessary without the amazing work done by [pyo3](https://www.github.com/pyo3/pyo3)

## Feedback, ideas and contributions

... are very welcome via [MusicalNinjas/pyo3-testing](https://github.com/MusicalNinjas/pyo3-testing)