Review of 083: an upgrade handled during shutdown is left for the broker; an enrolment cut short by shutdown is told to try again; a refused redelivery says what it probably is

internal/link/store_window_test.go

@@ -165,3 +165,17 @@ func TestWhatIsHeldLeavesRoomInThePrefetch(t *testing.T) {
 		t.Fatalf("a message past the ceiling was held: %+v", *last)
 	}
 }
+
+// An upgrade handled during shutdown is left for the broker too — the upgrader's error is the
+// cancelled context, which is no answer about the announcement.
+func TestAnUpgradeHandledDuringShutdownIsLeftForTheBroker(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	s := quietServer()
+	s.upgrader = upgradesWith{err: context.Canceled}
+	to := &settledAs{}
+	s.upgraded(ctx, a(t, to, "upgraded", Upgraded{Module: "gitea", Commit: "abcdef0123"}))
+	if !to.held() {
+		t.Fatalf("an upgrade handled during shutdown was settled, and so lost: %+v", *to)
+	}
+}