diff --git a/observer/observer_test.go b/observer/observer_test.go
index d457759..b2ac1c6 100644
--- a/observer/observer_test.go
+++ b/observer/observer_test.go
@@ -3,6 +3,7 @@ package observer
 import (
 	"fmt"
 	"testing"
+	"time"
 )
 
 func TestObserver(t *testing.T) {
@@ -28,4 +29,5 @@ func TestObserver(t *testing.T) {
 	newUser2 := "gan"
 	userRegister.Notify(newUser1)
 	userRegister.Notify(newUser2)
+	time.Sleep(1 * time.Second)
 }