add dao testing cases

modules/auth/service/role.go

@@ -0,0 +1,20 @@
+package service
+
+import (
+	"context"
+)
+
+type RoleService interface {
+	Create(ctx context.Context) error
+}
+
+type roleService struct {
+}
+
+func NewRoleService() RoleService {
+	return &roleService{}
+}
+
+func (svc *roleService) Create(ctx context.Context) error {
+	return nil
+}