examples/hello-world/src/main.rs

use actix_web::{middleware, web, App, HttpRequest, HttpServer};

fn index(req: HttpRequest) -> &'static str {
    println!("REQ: {:?}", req);
    "Hello world!"
}

fn main() -> std::io::Result<()> {
    std::env::set_var("RUST_LOG", "actix_web=info");
    env_logger::init();

    HttpServer::new(|| {
        App::new()
            // enable logger
            .wrap(middleware::Logger::default())
            .service(web::resource("/index.html").to(|| "Hello world!"))
            .service(web::resource("/").to(index))
    })
    .bind("127.0.0.1:8080")?
    .run()
}

#[cfg(test)]
mod tests {
    use super::*;
    use actix_web::dev::Service;
    use actix_web::{test, web, App, http, Error};

    #[test]
    fn test_index() -> Result<(), Error>  {
        let app = App::new().route("/", web::get().to(index));
        let mut app = test::init_service(app);

        let req = test::TestRequest::get()
            .uri("/")
            .to_request();
        let resp = test::block_on(app.call(req)).unwrap();

        assert_eq!(resp.status(), http::StatusCode::OK);

        let response_body = match resp.response().body().as_ref() {
            Some(actix_web::body::Body::Bytes(bytes)) => bytes,
            _ => panic!("Response error"),
        };

        assert_eq!(response_body, r##"Hello world!"##);

        Ok(())
    }
}