tests: rework the actually useful tests to live in the integration crate

crates/irtt-client/src/receive.rs

@@ -111,42 +111,3 @@ pub(crate) fn drain_tx_timestamps<S: std::os::fd::AsRawFd>(
 ) -> io::Result<()> {
     linux::drain_tx_timestamps(socket, on_timestamp)
 }
-
-#[cfg(all(test, feature = "tokio"))]
-mod tests {
-    use std::net::UdpSocket;
-
-    use crate::metadata::ReceiveMeta;
-
-    fn connected_loopback_pair() -> (UdpSocket, UdpSocket) {
-        let a = UdpSocket::bind("127.0.0.1:0").unwrap();
-        let b = UdpSocket::bind("127.0.0.1:0").unwrap();
-        a.connect(b.local_addr().unwrap()).unwrap();
-        b.connect(a.local_addr().unwrap()).unwrap();
-        (a, b)
-    }
-
-    #[test]
-    fn tokio_try_receive_preserves_fallback_metadata_and_would_block() {
-        let runtime = tokio::runtime::Builder::new_current_thread()
-            .enable_io()
-            .build()
-            .unwrap();
-
-        runtime.block_on(async {
-            let (sender, receiver) = connected_loopback_pair();
-            receiver.set_nonblocking(true).unwrap();
-            let receiver = tokio::net::UdpSocket::from_std(receiver).unwrap();
-            sender.send(b"tokio").unwrap();
-            receiver.readable().await.unwrap();
-
-            let mut buf = [0_u8; 16];
-            let datagram = super::try_recv_tokio_datagram(&receiver, &mut buf).unwrap();
-            assert_eq!(&buf[..datagram.len], b"tokio");
-            assert_eq!(datagram.meta, ReceiveMeta::default());
-
-            let error = super::try_recv_tokio_datagram(&receiver, &mut buf).unwrap_err();
-            assert_eq!(error.kind(), std::io::ErrorKind::WouldBlock);
-        });
-    }
-}