first pass at Testing.

examples/testing/Cargo.toml

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+[package]
+name = "testing"
+version = "0.1.0"
+authors = ["Cameron Dershem <cameron@pinkhatbeard.com>"]
+edition = "2018"
+
+[dependencies]
+actix-web = "1.0"
+futures = "0.1"
+bytes = "0.4"

examples/testing/src/integration_one.rs

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+// <integration-one>
+// use actix_web::test::TestServer;
+// use actix_web::HttpRequest;
+// use std::str;
+
+// fn index(req: HttpRequest) -> &'static str {
+//     "Hello world!"
+// }
+
+// fn main() {
+//     // start new test server
+//     let mut srv = TestServer::new(|app| app.handler(index));
+
+//     let request = srv.get().finish().unwrap();
+//     let response = srv.execute(request.send()).unwrap();
+//     assert!(response.status().is_success());
+
+//     let bytes = srv.execute(response.body()).unwrap();
+//     let body = str::from_utf8(&bytes).unwrap();
+//     assert_eq!(body, "Hello world!");
+// }
+// </integration-one>

examples/testing/src/integration_three.rs

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+// <integration-three>
+// #[test]
+// fn test() {
+//     let srv = TestServer::build_with_state(|| {
+//         // we can start diesel actors
+//         let addr = SyncArbiter::start(3, || {
+//             DbExecutor(SqliteConnection::establish("test.db").unwrap())
+//         });
+//         // then we can construct custom state, or it could be `()`
+//         MyState{addr: addr}
+//    })
+
+//    // register server handlers and start test server
+//    .start(|app| {
+//         app.resource(
+//             "/{username}/index.html", |r| r.with(
+//                 |p: Path<PParam>| format!("Welcome {}!", p.username)));
+//     });
+//     // now we can run our test code
+// );
+// </integration-three>

examples/testing/src/integration_two.rs

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+// <integration-two>
+// use actix_web::{http, test, App, HttpRequest, HttpResponse};
+
+// fn index(req: &HttpRequest) -> HttpResponse {
+//     HttpResponse::Ok().into()
+// }
+
+// /// This function get called by http server.
+// fn create_app() -> App {
+//     App::new().resource("/test", |r| r.h(index))
+// }
+
+// fn main() {
+//     let mut srv = test::TestServer::with_factory(create_app);
+
+//     let request = srv.client(http::Method::GET, "/test").finish().unwrap();
+//     let response = srv.execute(request.send()).unwrap();
+
+//     assert!(response.status().is_success());
+// }
+// </integration-two>

examples/testing/src/main.rs

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+mod integration_one;
+mod integration_three;
+mod integration_two;
+mod stream_response;
+mod websockets;
+// <unit-tests>
+use actix_web::{http, test, HttpRequest, HttpResponse};
+
+fn index(req: HttpRequest) -> HttpResponse {
+    if let Some(hdr) = req.headers().get(http::header::CONTENT_TYPE) {
+        if let Ok(_s) = hdr.to_str() {
+            return HttpResponse::Ok().into();
+        }
+    }
+    HttpResponse::BadRequest().into()
+}
+
+fn main() {
+    let req =
+        test::TestRequest::with_header("content-type", "text/plain").to_http_request();
+
+    let resp = test::block_on(index(req)).unwrap();
+    assert_eq!(resp.status(), http::StatusCode::OK);
+
+    let req = test::TestRequest::default().to_http_request();
+    let resp = test::block_on(index(req)).unwrap();
+    assert_eq!(resp.status(), http::StatusCode::BAD_REQUEST);
+}
+// </unit-tests>

examples/testing/src/stream_response.rs

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+// <stream-response>
+// use bytes::Bytes;
+// use futures::stream::poll_fn;
+// use futures::{Async, Poll, Stream};
+
+// use actix_web::http::{ContentEncoding, StatusCode};
+// use actix_web::test::TestServer;
+// use actix_web::{Error, HttpRequest, HttpResponse};
+
+// fn sse(_req: &HttpRequest) -> HttpResponse {
+//     let mut counter = 5usize;
+//     // yields `data: N` where N in [5; 1]
+//     let server_events = poll_fn(move || -> Poll<Option<Bytes>, Error> {
+//         if counter == 0 {
+//             return Ok(Async::Ready(None));
+//         }
+//         let payload = format!("data: {}\n\n", counter);
+//         counter -= 1;
+//         Ok(Async::Ready(Some(Bytes::from(payload))))
+//     });
+
+//     HttpResponse::build(StatusCode::OK)
+//         .content_encoding(ContentEncoding::Identity)
+//         .content_type("text/event-stream")
+//         .streaming(server_events)
+// }
+
+// fn main() {
+//     // start new test server
+//     let mut srv = TestServer::new(|app| app.handler(sse));
+
+//     // request stream
+//     let request = srv.get().finish().unwrap();
+//     let response = srv.execute(request.send()).unwrap();
+//     assert!(response.status().is_success());
+
+//     // convert ClientResponse to future, start read body and wait first chunk
+//     let mut stream = response.payload();
+//     loop {
+//         match srv.execute(stream.into_future()) {
+//             Ok((Some(bytes), remain)) => {
+//                 println!("{:?}", bytes);
+//                 stream = remain
+//             }
+//             Ok((None, _)) => break,
+//             Err(_) => panic!(),
+//         }
+//     }
+// }
+// </stream-response>

examples/testing/src/websockets.rs

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+// <web-socket>
+use actix::{Actor, StreamHandler};
+use actix_web::*;
+use futures::Stream;
+
+struct Ws; // <- WebSocket actor
+
+impl Actor for Ws {
+    type Context = ws::WebsocketContext<Self>;
+}
+
+impl StreamHandler<ws::Message, ws::ProtocolError> for Ws {
+    fn handle(&mut self, msg: ws::Message, ctx: &mut Self::Context) {
+        match msg {
+            ws::Message::Text(text) => ctx.text(text),
+            _ => (),
+        }
+    }
+}
+
+fn main() {
+    let mut srv = test::TestServer::new(|app| app.handler(|req| ws::start(req, Ws)));
+
+    let (reader, mut writer) = srv.ws().unwrap();
+    writer.text("text");
+
+    let (item, reader) = srv.execute(reader.into_future()).unwrap();
+    assert_eq!(item, Some(ws::Message::Text("text".to_owned())));
+}
+// </web-socket>