Merge "Some optimizations about unit test"

diff --cc tests/unit/test_utils.py
index d5cd610,22597dc..41a06f6
--- 1/tests/unit/test_utils.py
--- 2/tests/unit/test_utils.py
+++ b/tests/unit/test_utils.py
@@@ -7,13 -7,11 +7,14 @@@
  # http://www.apache.org/licenses/LICENSE-2.0
  ##############################################################################
  import os
 -
 +import mock
  import pytest
+ import mock
  
 +from deploy import utils
  from deploy.utils import (
 +    err_exit,
 +    check_sudo_privilege,
      check_file_exists,
      make_file_executable,
      confirm_dir_exists,