app_window 0.3.3

Cross-platform window library
Documentation 
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// SPDX-License-Identifier: MPL-2.0

//! Test to verify that the closure passed to app_window::application::main() actually executes.
//!
//! This test reproduces the bug where the closure passed to `application::main()`
//! is never executed on WASM, causing the program to return immediately without
//! running the user's initialization code.
//!
//! Expected behavior:
//! - The closure should execute within a reasonable timeframe (500ms)
//! - Debug output should show "Inside app_window::application::main() closure"
//!
//! Bug behavior on WASM:
//! - The function returns immediately
//! - The closure is never executed
//! - We never see "Inside app_window::application::main() closure"
//!
//! Run with: `cargo test --test wasm_main_closure_execution_test`

#[cfg(not(target_arch = "wasm32"))]
use std::time::Duration;
#[cfg(target_arch = "wasm32")]
use web_time::Duration;

#[cfg(not(target_arch = "wasm32"))]
use std::thread;
#[cfg(target_arch = "wasm32")]
use wasm_safe_thread as thread;

//for the time being, wasm_thread only works in browser
//see https://github.com/rustwasm/wasm-bindgen/issues/4534,
//though we also need wasm_thread support.
#[cfg(target_arch = "wasm32")]
wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);

fn main() {
    test_executors::sleep_on(test())
}

#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
async fn test() {
    let (s, r) = std::sync::mpsc::channel();
    let (s2, r2) = r#continue::continuation();

    thread::spawn(move || {
        //one message received here
        r.recv_timeout(Duration::from_millis(500)).unwrap();
        std::process::exit(0);
    });
    app_window::application::main(move || {
        //send two messages to the channel
        s.send(()).unwrap();
        s2.send(());
    });
    r2.await;
}