Rust Snippet: rstest Boilerplate Template

```cargo
[dependencies]
rstest = "0.19.0"
```

#[cfg(test)]
mod test {
    use rstest::rstest;
    #[rstest]
    #[case("a", "a")]
    #[case("b", "b")]
    fn run_test(#[case] input: &str, #[case] expected: &str) {
        let results = input;
        assert_eq!(expected, input);
    }
}