Fix test_ignore_outdated_membership_changes

Author: link2xt

src/receive_imf/tests.rs

@@ -4152,11 +4152,15 @@ async fn test_ignore_outdated_membership_changes() -> Result<()> {
 
     SystemTime::shift(Duration::from_secs(3600));
 
-    // Bob replies again adding Alice back.
+    // Bob replies again, even after some time this does not add Alice back.
+    //
+    // Bob cannot learn from Alice that Alice has left the group
+    // because Alice is not going to send more messages to the group.
     send_text_msg(bob, bob_chat_id, "i'm bob".to_string()).await?;
     let msg = &bob.pop_sent_msg().await;
     alice.recv_msg(msg).await;
-    assert!(is_contact_in_chat(alice, alice_chat_id, ContactId::SELF).await?);
+
+    assert!(!is_contact_in_chat(alice, alice_chat_id, ContactId::SELF).await?);
 
     Ok(())
 }