diff --git a/server/conn_test.go b/server/conn_test.go
index b3d1f57db1577..cd35257d72454 100644
--- a/server/conn_test.go
+++ b/server/conn_test.go
@@ -180,7 +180,6 @@ func TestInitialHandshake(t *testing.T) {
 
 	var outBuffer bytes.Buffer
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = 0
 	cfg.Status.StatusPort = 0
 	drv := NewTiDBDriver(store)
@@ -489,7 +488,6 @@ func testDispatch(t *testing.T, inputs []dispatchInput, capability uint32) {
 	var outBuffer bytes.Buffer
 	tidbdrv := NewTiDBDriver(store)
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port, cfg.Status.StatusPort = 0, 0
 	cfg.Status.ReportStatus = false
 	server, err := NewServer(cfg, tidbdrv)
@@ -1134,7 +1132,6 @@ func TestAuthPlugin2(t *testing.T) {
 	defer clean()
 
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = 0
 	cfg.Status.StatusPort = 0
 
diff --git a/server/tidb_serial_test.go b/server/tidb_serial_test.go
index b5f2483584052..68b5d634a5a4a 100644
--- a/server/tidb_serial_test.go
+++ b/server/tidb_serial_test.go
@@ -106,7 +106,6 @@ func TestTLSAuto(t *testing.T) {
 	}
 	cli := newTestServerClient()
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = cli.port
 	cfg.Status.ReportStatus = false
 	cfg.Security.AutoTLS = true
@@ -162,7 +161,6 @@ func TestTLSBasic(t *testing.T) {
 	}
 	cli := newTestServerClient()
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = cli.port
 	cfg.Status.ReportStatus = false
 	cfg.Security = config.Security{
@@ -234,7 +232,6 @@ func TestTLSVerify(t *testing.T) {
 	// Start the server with TLS & CA, if the client presents its certificate, the certificate will be verified.
 	cli := newTestServerClient()
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = cli.port
 	cfg.Status.ReportStatus = false
 	cfg.Security = config.Security{
@@ -302,7 +299,6 @@ func TestErrorNoRollback(t *testing.T) {
 
 	cli := newTestServerClient()
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = cli.port
 	cfg.Status.ReportStatus = false
 
@@ -422,7 +418,6 @@ func TestReloadTLS(t *testing.T) {
 	// try old cert used in startup configuration.
 	cli := newTestServerClient()
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = cli.port
 	cfg.Status.ReportStatus = false
 	cfg.Security = config.Security{
diff --git a/server/tidb_test.go b/server/tidb_test.go
index c76ad1957a766..eab37278c5b64 100644
--- a/server/tidb_test.go
+++ b/server/tidb_test.go
@@ -76,7 +76,6 @@ func createTidbTestSuite(t *testing.T) (*tidbTestSuite, func()) {
 	require.NoError(t, err)
 	ts.tidbdrv = NewTiDBDriver(ts.store)
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = ts.port
 	cfg.Status.ReportStatus = true
 	cfg.Status.StatusPort = ts.statusPort
@@ -242,7 +241,6 @@ func TestStatusPort(t *testing.T) {
 	defer cleanup()
 
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = 0
 	cfg.Status.ReportStatus = true
 	cfg.Status.StatusPort = ts.statusPort
@@ -273,7 +271,6 @@ func TestStatusAPIWithTLS(t *testing.T) {
 	cli := newTestServerClient()
 	cli.statusScheme = "https"
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = cli.port
 	cfg.Status.StatusPort = cli.statusPort
 	cfg.Security.ClusterSSLCA = "/tmp/ca-cert-2.pem"
@@ -329,7 +326,6 @@ func TestStatusAPIWithTLSCNCheck(t *testing.T) {
 	cli := newTestServerClient()
 	cli.statusScheme = "https"
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port = cli.port
 	cfg.Status.StatusPort = cli.statusPort
 	cfg.Security.ClusterSSLCA = caPath
@@ -887,7 +883,6 @@ func TestSystemTimeZone(t *testing.T) {
 
 	tk := testkit.NewTestKit(t, ts.store)
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.Port, cfg.Status.StatusPort = 0, 0
 	cfg.Status.ReportStatus = false
 	server, err := NewServer(cfg, ts.tidbdrv)
@@ -1216,7 +1211,6 @@ func TestGracefulShutdown(t *testing.T) {
 
 	cli := newTestServerClient()
 	cfg := newTestConfig()
-	cfg.Socket = ""
 	cfg.GracefulWaitBeforeShutdown = 2 // wait before shutdown
 	cfg.Port = 0
 	cfg.Status.StatusPort = 0
diff --git a/server/util_test.go b/server/util_test.go
index 35680210b75e4..c60f00bdf4e51 100644
--- a/server/util_test.go
+++ b/server/util_test.go
@@ -604,5 +604,6 @@ func newTestConfig() *config.Config {
 	cfg.Host = "127.0.0.1"
 	cfg.Status.StatusHost = "127.0.0.1"
 	cfg.Security.AutoTLS = false
+	cfg.Socket = ""
 	return cfg
 }