Fix issue with tests failing due to test-related race conditions.

internal/forward/watchdog_test.go

@@ -154,12 +154,21 @@ func (s *WatchdogTestSuite) TestMultipleWorkers() {
 	s.watchdog.RegisterWorker("worker-3", makeCallback("worker-3"))
 
 	// worker-1: Keep sending heartbeats (healthy)
+	// Use a done channel to ensure goroutine exits before test ends
 	ticker1 := time.NewTicker(50 * time.Millisecond)
-	defer ticker1.Stop()
+	done := make(chan struct{})
+	var wg sync.WaitGroup
+	wg.Add(1)
 	go func() {
+		defer wg.Done()
+		defer ticker1.Stop()
 		for i := 0; i < 10; i++ {
-			<-ticker1.C
-			s.watchdog.Heartbeat("worker-1")
+			select {
+			case <-ticker1.C:
+				s.watchdog.Heartbeat("worker-1")
+			case <-done:
+				return
+			}
 		}
 	}()
 
@@ -172,6 +181,10 @@ func (s *WatchdogTestSuite) TestMultipleWorkers() {
 	// Wait for hung workers to be detected
 	time.Sleep(600 * time.Millisecond)
 
+	// Signal goroutine to stop and wait for it
+	close(done)
+	wg.Wait()
+
 	// Check results
 	mu.Lock()
 	defer mu.Unlock()

internal/mdns/publisher.go

@@ -155,7 +155,8 @@ func (p *Publisher) Stop() {
 // goroutines to exit cleanly. This works around a race condition in the
 // grandcat/zeroconf library where recv4() can access ipv4conn after shutdown()
 // sets it to nil. See: https://github.com/grandcat/zeroconf/issues/95
-const shutdownSettleTime = 50 * time.Millisecond
+// Note: 100ms is needed for CI environments where timing can be more variable.
+const shutdownSettleTime = 100 * time.Millisecond
 
 // shutdownWithTimeout attempts to shutdown a zeroconf server with a timeout.
 // If shutdown hangs, it logs a warning and returns anyway.