test_case crate provides procedural macro attribute that generates parametrized test instances.

Crate has to be added as a dependency to Cargo.toml:

[dev-dependencies]
test-case = "2.1.0"

and imported to the scope of a block where it's being called (since attribute name collides with rust's built-in custom_test_frameworks) via:

use test_case::test_case;

#[cfg(test)]
mod tests {
    use test_case::test_case;

    #[test_case(-2, -4 ; "when both operands are negative")]
    #[test_case(2,  4  ; "when both operands are positive")]
    #[test_case(4,  2  ; "when operands are swapped")]
    fn multiplication_tests(x: i8, y: i8) {
        let actual = (x * y).abs();

        assert_eq!(8, actual)
    }
}

Output from cargo test for this example:

$ cargo test

running 4 tests
test tests::multiplication_tests::when_both_operands_are_negative ... ok
test tests::multiplication_tests::when_both_operands_are_positive ... ok
test tests::multiplication_tests::when_operands_are_swapped ... ok

test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

Most up to date documentation is available in our wiki.

Licensed under of MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

Project roadmap is available at link. All contributions are welcome.

Recommended tools:

• cargo readme - to regenerate README.md based on template and lib.rs comments
• cargo insta - to review test snapshots
• cargo edit - to add/remove dependencies
• cargo fmt - to format code
• cargo clippy - for all insights and tips
• cargo fix - for fixing warnings