add a test

Signed-off-by: Ryan Leung <[email protected]>

server/election/lease_test.go

@@ -104,3 +104,34 @@ func (s *testLeaseSuite) TestLease(c *C) {
 	time.Sleep((defaultLeaseTimeout + 1) * time.Second)
 	c.Check(lease1.IsExpired(), IsTrue)
 }
+
+func TestLeaseKeepAlive(t *testing.T) {
+	re := require.New(t)
+	cfg := etcdutil.NewTestSingleConfig(t)
+	etcd, err := embed.StartEtcd(cfg)
+	defer func() {
+		etcd.Close()
+	}()
+	re.NoError(err)
+
+	ep := cfg.LCUrls[0].String()
+	client, err := clientv3.New(clientv3.Config{
+		Endpoints: []string{ep},
+	})
+	re.NoError(err)
+
+	<-etcd.Server.ReadyNotify()
+
+	// Create the lease.
+	lease := &lease{
+		Purpose: "test_lease",
+		client:  client,
+		lease:   clientv3.NewLease(client),
+	}
+
+	re.NoError(lease.Grant(defaultLeaseTimeout))
+	ch := lease.keepAliveWorker(context.Background(), 2*time.Second)
+	time.Sleep(2 * time.Second)
+	<-ch
+	re.NoError(lease.Close())
+}