refactor: fix unit tests

Signed-off-by: chlins <chlins.zhang@gmail.com>

src/replication/adapter/huawei/huawei_adapter.go

@@ -218,7 +218,10 @@ func AdapterFactory(registry *model.Registry) (adp.Adapter, error) {
 	}
 
 	var (
-		modifiers  []modifier.Modifier
+		modifiers = []modifier.Modifier{
+			&auth.UserAgentModifier{
+				UserAgent: adp.UserAgentReplication,
+			}}
 		authorizer modifier.Modifier
 	)
 	if registry.Credential != nil {

src/replication/adapter/huawei/image_registry_test.go

@@ -1,6 +1,7 @@
 package huawei
 
 import (
+	"os"
 	"strings"
 	"testing"
 
@@ -20,7 +21,11 @@ func init() {
 		Insecure:    false,
 		Status:      "",
 	}
-	HWAdapter.registry = hwRegistry
+	adp, err := AdapterFactory(hwRegistry)
+	if err != nil {
+		os.Exit(1)
+	}
+	HWAdapter = *adp.(*adapter)
 }
 
 func TestAdapter_FetchImages(t *testing.T) {