Fixed RunLoop test in the same way as an example

fastping_test.go

@@ -180,13 +180,17 @@ func TestRunLoop(t *testing.T) {
 	wait := make(chan bool)
 	quit, errch := p.RunLoop()
 	ticker := time.NewTicker(time.Millisecond * 250)
+loop:
+	for {
 		select {
 		case err := <-errch:
 			t.Fatalf("Pinger returns error %v", err)
 		case <-ticker.C:
+			ticker.Stop()
 			quit <- wait
 		case <-wait:
-		break
+			break loop
+		}
 	}
 
 	if recvCount < 2 {