Nightly clippy raises warning "unneeded unit expression"

test-case version: 1.1.0
rustc & clippy version: 1.54.0-nightly (c1e8f3a58 2021-05-30)

Clippy raises a warning to the following code.

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

    #[test_case(1, 1)]
    fn square(x: i32, y: i32) {
        assert_eq!(x*x, y);
    }
}

Messages from clippy,

warning: unneeded unit expression
 --> src/main.rs:9:5
  |
9 |     #[test_case(1, 1)]
  |     ^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(clippy::unused_unit)]` on by default
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
  = note: this warning originates in the attribute macro `test_case` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: 1 warning emitted

I think this warning should be suppressed in macro, or we should modify the macro not to use unit expressions, if possible.

frondeus / test-case

Nightly clippy raises warning "unneeded unit expression" #66