pause_hold: pin the undeclared-agent case and fix the test comment

swarm-controller/src/pause_hold.rs

@@ -109,8 +109,7 @@ mod tests {
         assert_eq!(declared(&wanted, "atlas").await, Some(AgentState::Paused));
     }
 
-    /// An operator's `Offline` is not overruled by the agent's pause, and an
+    /// An operator's `Offline` is not overruled by the agent's pause.
-    /// agent no hive declares leaves the pause to be tried again.
     #[tokio::test]
     async fn only_an_agent_declared_up_is_paused() {
         let nats = TestNats::start();
@@ -130,4 +129,24 @@ mod tests {
         assert_eq!(declared(&wanted, "atlas").await, Some(AgentState::Offline));
         assert!(login.unheld_pauses().is_empty(), "nothing left to hold");
     }
+
+    /// An agent no hive declares has nothing to override: its pause is held at
+    /// once and nothing is written to any declaration.
+    #[tokio::test]
+    async fn an_undeclared_agent_is_held_at_once_and_nothing_is_declared() {
+        let nats = TestNats::start();
+        let wanted = WantedWriter::new(nats.client().await);
+        let hives = vec!["pr1ma".to_owned()];
+        let login = Reported::default();
+        login.record(
+            &swarm_queue_client::agent_state_subject("atlas"),
+            &header(Some("skipped get_loose_ends")),
+        );
+        assert_eq!(login.unheld_pauses(), ["atlas"], "control: pending first");
+
+        hold_pending(&login, &wanted, &hives).await;
+        assert!(login.unheld_pauses().is_empty(), "held at once");
+        assert_eq!(declared(&wanted, "atlas").await, None);
+        assert!(wanted.view("pr1ma").await.unwrap().is_none());
+    }
 }