integration test verifying that we can read messages after initiating close handshake.

tests/receive_after_init_close.rs

@@ -0,0 +1,61 @@
+//! Verifies that we can read data messages even if we have initiated a close handshake,
+//! but before we got confirmation.
+
+use std::net::TcpListener;
+use std::process::exit;
+use std::thread::{sleep, spawn};
+use std::time::Duration;
+
+use tungstenite::{accept, connect, Error, Message};
+use url::Url;
+
+#[test]
+fn test_receive_after_init_close() {
+    env_logger::init();
+
+    spawn(|| {
+        sleep(Duration::from_secs(5));
+        println!("Unit test executed too long, perhaps stuck on WOULDBLOCK...");
+        exit(1);
+    });
+
+    let server = TcpListener::bind("127.0.0.1:3013").unwrap();
+
+    let client_thread = spawn(move || {
+        let (mut client, _) = connect(Url::parse("ws://localhost:3013/socket").unwrap()).unwrap();
+
+        client
+            .write_message(Message::Text("Hello WebSocket".into()))
+            .unwrap();
+
+        let message = client.read_message().unwrap(); // receive close from server
+        assert!(message.is_close());
+
+        let err = client.read_message().unwrap_err(); // now we should get ConnectionClosed
+        match err {
+            Error::ConnectionClosed => {}
+            _ => panic!("unexpected error"),
+        }
+    });
+
+    let client_handler = server.incoming().next().unwrap();
+    let mut client_handler = accept(client_handler.unwrap()).unwrap();
+
+    client_handler.close(None).unwrap(); // send close to client
+
+    // This read should succeed even though we already initiated a close
+    let message = client_handler.read_message().unwrap();
+    assert_eq!(message.into_data(), b"Hello WebSocket");
+
+    assert!(client_handler.read_message().unwrap().is_close()); // receive acknowledgement
+
+    let err = client_handler.read_message().unwrap_err(); // now we should get ConnectionClosed
+    match err {
+        Error::ConnectionClosed => {}
+        _ => panic!("unexpected error"),
+    }
+
+    drop(client_handler);
+
+    client_thread.join().unwrap();
+}