You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: app.rs
    path of file: ./repos/rust-farm/handson/walking-cat/tests
    
    the code of the file until where you have to start completion: use futures::prelude::*;
use js_sys::Error;
use wasm_bindgen::JsValue;
use wasm_bindgen_futures::JsFuture;
use wasm_bindgen_test::{wasm_bindgen_test, wasm_bindgen_test_configure};

wasm_bindgen_test_configure!(run_in_browser);

// This runs a unit test in native Rust, so it can only use Rust APIs.
#[test]
fn rust_te
    
fn async_test() -> impl Future<Item = (), Error = JsValue> {
    // Creates a JavaScript Promise which will asynchronously resolve with the value 42.
    let promise = js_sys::Promise::resolve(&JsValue::from(42));

    // Converts that Promise into a Future.
    // The unit test will wait for the Future to resolve.
    JsFuture::from(promise).map(|x| {
        assert_eq!(x, 42);
    })
}