diff --git a/client/retry/backoff.go b/client/retry/backoff.go
index e2ca9ab3972..b47a39d8eaa 100644
--- a/client/retry/backoff.go
+++ b/client/retry/backoff.go
@@ -34,9 +34,11 @@ func (bo *BackOffer) Exec(
 	fn func() error,
 ) error {
 	if err := fn(); err != nil {
+		after := time.NewTimer(bo.nextInterval())
+		defer after.Stop()
 		select {
 		case <-ctx.Done():
-		case <-time.After(bo.nextInterval()):
+		case <-after.C:
 			failpoint.Inject("backOffExecute", func() {
 				testBackOffExecuteFlag = true
 			})
diff --git a/pkg/schedule/operator/operator_test.go b/pkg/schedule/operator/operator_test.go
index 9d924738543..c16d929f379 100644
--- a/pkg/schedule/operator/operator_test.go
+++ b/pkg/schedule/operator/operator_test.go
@@ -17,7 +17,6 @@ package operator
 import (
 	"context"
 	"encoding/json"
-	"fmt"
 	"sync/atomic"
 	"testing"
 	"time"
@@ -514,7 +513,7 @@ func (suite *operatorTestSuite) TestOpStepTimeout() {
 		},
 	}
 	for i, v := range testData {
-		fmt.Printf("case:%d\n", i)
+		suite.T().Logf("case: %d", i)
 		for _, step := range v.step {
 			suite.Equal(v.expect, step.Timeout(v.regionSize))
 		}
diff --git a/tests/integrations/mcs/tso/server_test.go b/tests/integrations/mcs/tso/server_test.go
index 58006b87eeb..643fb3c7911 100644
--- a/tests/integrations/mcs/tso/server_test.go
+++ b/tests/integrations/mcs/tso/server_test.go
@@ -89,7 +89,7 @@ func (suite *tsoServerTestSuite) TearDownSuite() {
 func (suite *tsoServerTestSuite) TestTSOServerStartAndStopNormally() {
 	defer func() {
 		if r := recover(); r != nil {
-			fmt.Println("Recovered from an unexpected panic", r)
+			suite.T().Log("Recovered from an unexpected panic", r)
 			suite.T().Errorf("Expected no panic, but something bad occurred with")
 		}
 	}()
diff --git a/tests/pdctl/config/config_test.go b/tests/pdctl/config/config_test.go
index 91d6723c2ac..badccd9becc 100644
--- a/tests/pdctl/config/config_test.go
+++ b/tests/pdctl/config/config_test.go
@@ -832,7 +832,6 @@ func (suite *configTestSuite) checkPDServerConfig(cluster *tests.TestCluster) {
 		LastHeartbeat: time.Now().UnixNano(),
 	}
 	tests.MustPutStore(re, cluster, store)
-	defer cluster.Destroy()
 
 	output, err := pdctl.ExecuteCommand(cmd, "-u", pdAddr, "config", "show", "server")
 	re.NoError(err)
@@ -844,7 +843,9 @@ func (suite *configTestSuite) checkPDServerConfig(cluster *tests.TestCluster) {
 	re.Equal("table", conf.KeyType)
 	re.Equal(typeutil.StringSlice([]string{}), conf.RuntimeServices)
 	re.Equal("", conf.MetricStorage)
-	re.Equal("auto", conf.DashboardAddress)
+	if conf.DashboardAddress != "auto" { // dashboard has been assigned
+		re.Equal(leaderServer.GetAddr(), conf.DashboardAddress)
+	}
 	re.Equal(int(3), conf.FlowRoundByDigit)
 }
 
diff --git a/tests/server/api/rule_test.go b/tests/server/api/rule_test.go
index 9176a00e66d..ffdf56b6567 100644
--- a/tests/server/api/rule_test.go
+++ b/tests/server/api/rule_test.go
@@ -1097,7 +1097,6 @@ func (suite *regionRuleTestSuite) checkRegionPlacementRule(cluster *tests.TestCl
 	var label labeler.LabelRule
 	escapedID := url.PathEscape("keyspaces/0")
 	u = fmt.Sprintf("%s/config/region-label/rule/%s", urlPrefix, escapedID)
-	fmt.Println("u====", u)
 	err = tu.ReadGetJSON(re, testDialClient, u, &label)
 	suite.NoError(err)
 	suite.Equal(label.ID, "keyspaces/0")
diff --git a/tests/server/cluster/cluster_test.go b/tests/server/cluster/cluster_test.go
index a5861f1ba43..18a82bcf0fe 100644
--- a/tests/server/cluster/cluster_test.go
+++ b/tests/server/cluster/cluster_test.go
@@ -1288,7 +1288,7 @@ func TestTransferLeaderForScheduler(t *testing.T) {
 	re.NoError(err)
 	tc.WaitLeader()
 	// start
-	leaderServer := tc.GetServer(tc.GetLeader())
+	leaderServer := tc.GetLeaderServer()
 	re.NoError(leaderServer.BootstrapCluster())
 	rc := leaderServer.GetServer().GetRaftCluster()
 	re.NotNil(rc)
@@ -1327,7 +1327,7 @@ func TestTransferLeaderForScheduler(t *testing.T) {
 	tc.ResignLeader()
 	rc.Stop()
 	tc.WaitLeader()
-	leaderServer = tc.GetServer(tc.GetLeader())
+	leaderServer = tc.GetLeaderServer()
 	rc1 := leaderServer.GetServer().GetRaftCluster()
 	rc1.Start(leaderServer.GetServer())
 	re.NoError(err)
@@ -1347,7 +1347,7 @@ func TestTransferLeaderForScheduler(t *testing.T) {
 	tc.ResignLeader()
 	rc1.Stop()
 	tc.WaitLeader()
-	leaderServer = tc.GetServer(tc.GetLeader())
+	leaderServer = tc.GetLeaderServer()
 	rc = leaderServer.GetServer().GetRaftCluster()
 	rc.Start(leaderServer.GetServer())
 	re.NotNil(rc)
diff --git a/tests/server/member/member_test.go b/tests/server/member/member_test.go
index 5965f9e22a6..e6657ffd223 100644
--- a/tests/server/member/member_test.go
+++ b/tests/server/member/member_test.go
@@ -260,7 +260,7 @@ func TestPDLeaderLostWhileEtcdLeaderIntact(t *testing.T) {
 	re.NoError(err)
 
 	leader1 := cluster.WaitLeader()
-	memberID := cluster.GetServer(leader1).GetLeader().GetMemberId()
+	memberID := cluster.GetLeaderServer().GetLeader().GetMemberId()
 
 	re.NoError(failpoint.Enable("github.com/tikv/pd/server/leaderLoopCheckAgain", fmt.Sprintf("return(\"%d\")", memberID)))
 	re.NoError(failpoint.Enable("github.com/tikv/pd/server/exitCampaignLeader", fmt.Sprintf("return(\"%d\")", memberID)))
@@ -338,7 +338,7 @@ func TestCampaignLeaderFrequently(t *testing.T) {
 	re.NotEmpty(cluster.GetLeader())
 
 	for i := 0; i < 3; i++ {
-		cluster.GetServers()[cluster.GetLeader()].ResetPDLeader()
+		cluster.GetLeaderServer().ResetPDLeader()
 		cluster.WaitLeader()
 	}
 	// leader should be changed when campaign leader frequently
diff --git a/tests/server/region_syncer/region_syncer_test.go b/tests/server/region_syncer/region_syncer_test.go
index b73d4abb9b5..6521432c0dc 100644
--- a/tests/server/region_syncer/region_syncer_test.go
+++ b/tests/server/region_syncer/region_syncer_test.go
@@ -259,7 +259,7 @@ func TestPrepareCheckerWithTransferLeader(t *testing.T) {
 	err = cluster.RunInitialServers()
 	re.NoError(err)
 	cluster.WaitLeader()
-	leaderServer := cluster.GetServer(cluster.GetLeader())
+	leaderServer := cluster.GetLeaderServer()
 	re.NoError(leaderServer.BootstrapCluster())
 	rc := leaderServer.GetServer().GetRaftCluster()
 	re.NotNil(rc)