gossip-support: add unittests for update authorities

polkadot/node/network/gossip-support/Cargo.toml

@@ -38,5 +38,6 @@ polkadot-node-subsystem-test-helpers = { path = "../../subsystem-test-helpers" }
 
 assert_matches = "1.4.0"
 async-trait = "0.1.74"
+parking_lot = "0.12.1"
 lazy_static = "1.4.0"
 quickcheck = "1.0.3"

polkadot/node/network/gossip-support/src/lib.rs

@@ -63,8 +63,12 @@ use metrics::Metrics;
 const LOG_TARGET: &str = "parachain::gossip-support";
 // How much time should we wait to reissue a connection request
 // since the last authority discovery resolution failure.
+#[cfg(not(test))]
 const BACKOFF_DURATION: Duration = Duration::from_secs(5);
 
+#[cfg(test)]
+const BACKOFF_DURATION: Duration = Duration::from_millis(500);
+
 /// Duration after which we consider low connectivity a problem.
 ///
 /// Especially at startup low connectivity is expected (authority discovery cache needs to be
@@ -271,8 +275,8 @@ where
 					)
 					.await?;
 				}
-				// authority_discovery is just a cache so let's try every leaf to detect if there
-				// are new authorities there.
+				// authority_discovery is just a cache so let's try every time we try to re-connect
+				// if new authorities are present.
 				self.update_authority_ids(sender, session_info.discovery_keys).await;
 			}
 		}