use wasm_bindgen::prelude::*; use wasm_bindgen_test::*; #[wasm_bindgen(module = "/tests/headless/strings.js")] extern "C" { fn test_string_roundtrip(c: &Closure String>); } #[wasm_bindgen_test] fn string_roundtrip() { test_string_roundtrip(&Closure::wrap(Box::new(|s| s))); }