implement persistent memberships

crates/projection-xmpp/tests/lib.rs

@@ -1,4 +1,5 @@
 use std::io::ErrorKind;
+use std::net::SocketAddr;
 use std::sync::Arc;
 use std::time::Duration;
 
@@ -281,6 +282,7 @@ async fn terminate_socket() -> Result<()> {
     assert_matches!(s.next_xml_event().await?, Event::End(b) => assert_eq!(b.local_name().into_inner(), b"features"));
     s.send(r#"<starttls/>"#).await?;
     assert_matches!(s.next_xml_event().await?, Event::Empty(b) => assert_eq!(b.local_name().into_inner(), b"proceed"));
+    let buffer = s.buffer;
 
     let connector = TlsConnector::from(Arc::new(
         ClientConfig::builder()