new_contents: from __future__ import absolute_import
  from __future__ import division
  from __future__ import unicode_literals
  
  import os
  
  from tempfile import NamedTemporaryFile
  from unittest import TestCase
  
  from spreadflow_core.config import config_eval
  from spreadflow_core.flow import Flowmap
  
  class ConfigTestCase(TestCase):
  
      def test_config_eval(self):
          with NamedTemporaryFile(delete=False) as tmpfile:
              tmpfile.write(b'from spreadflow_core.script import *')
  
          flowmap = config_eval(tmpfile.name)
          os.unlink(tmpfile.name)
  
          self.assertIsInstance(flowmap, Flowmap)
  
subject: Add test case for config_eval