diff --git a/core/discov/clients_test.go b/core/discov/clients_test.go
index 89eeb972..132a8824 100644
--- a/core/discov/clients_test.go
+++ b/core/discov/clients_test.go
@@ -28,6 +28,9 @@ func TestExtract(t *testing.T) {
 
 	_, ok = extract("any", -1)
 	assert.False(t, ok)
+
+	_, ok = extract("any", 10)
+	assert.False(t, ok)
 }
 
 func TestMakeKey(t *testing.T) {
diff --git a/core/discov/publisher_test.go b/core/discov/publisher_test.go
index ab6d0aaa..e99ed2f3 100644
--- a/core/discov/publisher_test.go
+++ b/core/discov/publisher_test.go
@@ -4,10 +4,12 @@ import (
 	"errors"
 	"sync"
 	"testing"
+	"time"
 
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/assert"
 	"github.com/tal-tech/go-zero/core/discov/internal"
+	"github.com/tal-tech/go-zero/core/lang"
 	"github.com/tal-tech/go-zero/core/logx"
 	"go.etcd.io/etcd/clientv3"
 )
@@ -152,3 +154,16 @@ func TestPublisher_keepAliveAsyncPause(t *testing.T) {
 	pub.Pause()
 	wg.Wait()
 }
+
+func TestPublisher_Resume(t *testing.T) {
+	publisher := new(Publisher)
+	publisher.resumeChan = make(chan lang.PlaceholderType)
+	go func() {
+		publisher.Resume()
+	}()
+	go func() {
+		time.Sleep(time.Minute)
+		t.Fail()
+	}()
+	<-publisher.resumeChan
+}
diff --git a/core/discov/subscriber_test.go b/core/discov/subscriber_test.go
index b4f16b30..3d24cfb8 100644
--- a/core/discov/subscriber_test.go
+++ b/core/discov/subscriber_test.go
@@ -1,6 +1,7 @@
 package discov
 
 import (
+	"sync/atomic"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -198,3 +199,18 @@ func TestContainer(t *testing.T) {
 		}
 	}
 }
+
+func TestSubscriber(t *testing.T) {
+	var opt subOptions
+	Exclusive()(&opt)
+
+	sub := new(Subscriber)
+	sub.items = newContainer(opt.exclusive)
+	var count int32
+	sub.AddListener(func() {
+		atomic.AddInt32(&count, 1)
+	})
+	sub.items.notifyChange()
+	assert.Empty(t, sub.Values())
+	assert.Equal(t, int32(1), atomic.LoadInt32(&count))
+}