How to use rstest

rstest is a Rust testing framework that simplifies parameterized tests using fixtures and macros, but it is not present in your provided source code context which only contains aho-corasick metadata and rustfmt type alias tests. To use it, you must first add it to your project's Cargo.toml and then import the macros in your test module.

[dev-dependencies]
rstest = "0.18"

use rstest::rstest;

#[rstest]
#[case(1, 2, 3)]
#[case(4, 5, 9)]
fn test_add(#[case] a: i32, #[case] b: i32, #[case] expected: i32) {
    assert_eq!(a + b, expected);
}

rstest is a tool that helps you write cleaner tests by letting you run the same test code with different data sets automatically. Think of it like a spreadsheet where you write a formula once and it calculates the result for every row, rather than writing the formula for each row manually. You use it when you need to verify that your code handles many different inputs correctly without repeating yourself.