Rendering rust-dominator app in headless browser with wasm-bindgen-test

dominator-headless.rs

use wasm_bindgen::prelude::*;
use wasm_bindgen_test::*;
use wasm_bindgen_test::wasm_bindgen_test_configure;

use dominator_test::App;

wasm_bindgen_test_configure!(run_in_browser);

#[wasm_bindgen_test(async)]
async fn test_html() {
    let html: String = render_app().await;
    assert_eq!(html, "...");
}

#[wasm_bindgen]
pub async fn render_app() -> String {
    let document = web_sys::window().unwrap().document().unwrap();
    let mount_el = document.create_element("div").unwrap();

    let app = App::default();
    dominator::append_dom(&mount_el, app.render());

    gloo_timers::future::TimeoutFuture::new(0).await;
    mount_el.inner_html()
}