diff --git a/test/tcc_grpc_cover.go b/test/tcc_grpc_cover.go
deleted file mode 100644
index 3cecef2..0000000
--- a/test/tcc_grpc_cover.go
+++ /dev/null
@@ -1,29 +0,0 @@
-package test
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/yedf/dtm/dtmcli/dtmimp"
-	"github.com/yedf/dtm/dtmgrpc"
-	"github.com/yedf/dtm/examples"
-)
-
-func TestTccGrpcCoverNotConnected(t *testing.T) {
-	gid := dtmimp.GetFuncName()
-	err := dtmgrpc.TccGlobalTransaction("localhost:01", gid, func(tcc *dtmgrpc.TccGrpc) error {
-		return nil
-	})
-	assert.Error(t, err)
-}
-
-func TestTccGrpcCoverPanic(t *testing.T) {
-	gid := dtmimp.GetFuncName()
-	err := dtmimp.CatchP(func() {
-		_ = dtmgrpc.TccGlobalTransaction(examples.DtmHttpServer, gid, func(tcc *dtmgrpc.TccGrpc) error {
-			panic("user panic")
-		})
-		assert.FailNow(t, "not executed")
-	})
-	assert.Contains(t, err.Error(), "user panic")
-}
diff --git a/test/tcc_grpc_cover_test.go b/test/tcc_grpc_cover_test.go
new file mode 100644
index 0000000..f4c3fef
--- /dev/null
+++ b/test/tcc_grpc_cover_test.go
@@ -0,0 +1,48 @@
+package test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/yedf/dtm/dtmcli/dtmimp"
+	"github.com/yedf/dtm/dtmgrpc"
+	"github.com/yedf/dtm/examples"
+	"google.golang.org/protobuf/types/known/emptypb"
+)
+
+func TestTccGrpcCoverNotConnected(t *testing.T) {
+	gid := dtmimp.GetFuncName()
+	err := dtmgrpc.TccGlobalTransaction("localhost:01", gid, func(tcc *dtmgrpc.TccGrpc) error {
+		return nil
+	})
+	assert.Error(t, err)
+}
+
+func TestTccGrpcCoverPanic(t *testing.T) {
+	gid := dtmimp.GetFuncName()
+	err := dtmimp.CatchP(func() {
+		_ = dtmgrpc.TccGlobalTransaction(examples.DtmGrpcServer, gid, func(tcc *dtmgrpc.TccGrpc) error {
+			panic("user panic")
+		})
+		assert.FailNow(t, "not executed")
+	})
+	assert.Contains(t, err.Error(), "user panic")
+}
+
+func TestTccGrpcCoverCallBranch(t *testing.T) {
+	req := examples.GenBusiReq(30, false, false)
+	gid := dtmimp.GetFuncName()
+	err := dtmgrpc.TccGlobalTransaction(examples.DtmGrpcServer, gid, func(tcc *dtmgrpc.TccGrpc) error {
+
+		r := &emptypb.Empty{}
+		err := tcc.CallBranch(req, "not_exists://abc", examples.BusiGrpc+"/examples.Busi/TransOutConfirm", examples.BusiGrpc+"/examples.Busi/TransOutRevert", r)
+		assert.Error(t, err)
+
+		tcc.Dtm = "localhost:01"
+		err = tcc.CallBranch(req, examples.BusiGrpc+"/examples.Busi/TransOut", examples.BusiGrpc+"/examples.Busi/TransOutConfirm", examples.BusiGrpc+"/examples.Busi/TransOutRevert", r)
+		assert.Error(t, err)
+
+		return err
+	})
+	assert.Error(t, err)
+}