text: import sys
  from subprocess import Popen, PIPE
  import unittest
  
  from scrapy.utils.test import get_testenv
  
  class CmdlineTest(unittest.TestCase):
  
      def setUp(self):
          self.env = get_testenv()
          self.env['SCRAPY_SETTINGS_MODULE'] = 'scrapy.tests.test_cmdline.settings'
  
      def _execute(self, *new_args, **kwargs):
          args = (sys.executable, '-m', 'scrapy.cmdline') + new_args
          proc = Popen(args, stdout=PIPE, stderr=PIPE, env=self.env, **kwargs)
          comm = proc.communicate()
          return comm[0].strip()
  
      def test_default_settings(self):
          self.assertEqual(self._execute('settings', '--get', 'TEST1'), \
                           'default')
  
      def test_override_settings_using_set_arg(self):
          self.assertEqual(self._execute('settings', '--get', 'TEST1', '-s', 'TEST1=override'), \
                           'override')
  
      def test_override_settings_using_envvar(self):
          self.env['SCRAPY_TEST1'] = 'override'
          self.assertEqual(self._execute('settings', '--get', 'TEST1'), \
                           'override')
  
  