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add instructions for setting up cargo insta (#334)

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Adrian Garcia Badaracco 2022-10-06 07:01:11 -05:00 • committed by GitHub
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CONTRIBUTING.md
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@ -14,6 +14,12 @@ your proposed change.
ruff is written in Rust (1.63.0). You'll need to install the
[Rust toolchain](https://www.rust-lang.org/tools/install) for development.
You'll also need [Insta](https://insta.rs/docs/) to update snapshot tests:
```shell
cargo install cargo-insta
```
### Development
After cloning the repository, run ruff locally with:
@ -58,7 +64,7 @@ similar rules are implemented.
To add a test fixture, create a file under `resources/test/fixtures`, named to match the `CheckCode`
you defined earlier (e.g., `E402.py`). This file should contain a variety of violations and
non-violations designed to evaluate and demonstrate the behavior of your lint rule. Run ruff locally
with (e.g.) `cargo run resources/test/fixtures/E402.py`. Once you're satisified with the output,
with (e.g.) `cargo run resources/test/fixtures/E402.py`. Once you're satisfied with the output,
codify the behavior as a snapshot test by adding a new function to the `mod tests` section of
`src/linter.rs`, like so: