# Contributing to cargo-mutants
Pull requests are welcome. If the change is not obvious please feel free to open
a bug or Github discussion first.
## Code of Conduct
This project is conducted in accord with the [Rust Code of
Conduct](https://www.rust-lang.org/policies/code-of-conduct).
## UI Style
- Always print paths with forward slashes, even on Windows. Use `path_slash`.
## Rust Style
Generally, variables and parameters should be the snake_case version of their
type name, unless that would be unclear: `source_tree: SourceTree`.
For this relatively small project I'm moving towards `pub use` of all public
names into `main.rs`, so that other implementation modules can just
`use crate::*`.
Try to keep one major class or separation of concern per mod, with
implementation details being private. However, fields that would have trivial
getters and that don't break the abstraction can be public.
## Testing
Of course, please add tests for new features or bug fixes. The primary means of testing is Rust source trees under `testdata/tree`: you can copy an existing tree and modify it to show the new behavior that you want to test.
Unit tests within the source file can also be added for particular behavior that is hard to exercise from a command-line test.