new_contents: import os
  import subprocess
  
  PROJECT_DIR = os.getcwd()
  TEST_PROJECT_DIR = os.path.join(PROJECT_DIR, 'test_project')
  
  
  def test_configuration_argument_in_cli():
      """Verify that's configuration option has been added to managements commands"""
      os.chdir(TEST_PROJECT_DIR)
      p = subprocess.Popen(['python', 'manage.py', 'test',
                            '--help'], stdout=subprocess.PIPE)
      assert '--configuration' in p.communicate()[0].decode('UTF-8')
      p = subprocess.Popen(['python', 'manage.py', 'runserver',
                            '--help'], stdout=subprocess.PIPE)
      assert '--configuration' in p.communicate()[0].decode('UTF-8')
      os.chdir(PROJECT_DIR)
  
subject: Add a test for configuration argument