Add unit test for pulsarClient Seek (#11107)

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

internal/util/mqclient/pulsar_client_test.go

@@ -376,6 +376,58 @@ func TestPulsarClient_Consume2(t *testing.T) {
 	log.Info("main done")
 }
 
+func TestPulsarClient_Seek(t *testing.T) {
+	pulsarAddress, _ := Params.Load("_PulsarAddress")
+	pc, err := GetPulsarClientInstance(pulsar.ClientOptions{URL: pulsarAddress})
+	defer pc.Close()
+	assert.NoError(t, err)
+	assert.NotNil(t, pc)
+	rand.Seed(time.Now().UnixNano())
+
+	ctx := context.Background()
+	topic := fmt.Sprintf("test-topic-%d", rand.Int())
+	subName := fmt.Sprintf("test-subname-%d", rand.Int())
+
+	producer, err := pc.CreateProducer(ProducerOptions{Topic: topic})
+	assert.Nil(t, err)
+	assert.NotNil(t, producer)
+
+	log.Info("Produce start")
+	var id MessageID
+	arr := []int{1, 2, 3}
+	for _, v := range arr {
+		msg := &ProducerMessage{
+			Payload:    IntToBytes(v),
+			Properties: map[string]string{},
+		}
+		id, err = producer.Send(ctx, msg)
+		assert.Nil(t, err)
+	}
+
+	log.Info("Produced")
+
+	consumer, err := pc.client.Subscribe(pulsar.ConsumerOptions{
+		Topic:                       topic,
+		SubscriptionName:            subName,
+		Type:                        pulsar.KeyShared,
+		SubscriptionInitialPosition: pulsar.SubscriptionPositionEarliest,
+	})
+	assert.Nil(t, err)
+	assert.NotNil(t, consumer)
+	defer consumer.Close()
+	seekID := id.(*pulsarID).messageID
+	consumer.Seek(seekID)
+
+	msgChan := consumer.Chan()
+
+	select {
+	case msg := <-msgChan:
+		assert.Equal(t, 3, BytesToInt(msg.Payload()))
+	case <-time.After(2 * time.Second):
+		log.Info("after 2 seconds")
+	}
+}
+
 func TestPulsarClient_EarliestMessageID(t *testing.T) {
 	pulsarAddress, _ := Params.Load("_PulsarAddress")
 	client, _ := GetPulsarClientInstance(pulsar.ClientOptions{URL: pulsarAddress})