'--output=unified emits settings diff in unified mode.'

def test_unified(self):

    self.write_settings('settings_to_diff.py', sdict={'FOO': '"bar"'})
    self.addCleanup(self.remove_settings, 'settings_to_diff.py')
    args = ['diffsettings', '--settings=settings_to_diff', '--output=unified']
    (out, err) = self.run_manage(args)
    self.assertNoOutput(err)
    self.assertOutput(out, "+    FOO    =    'bar'")
    self.assertOutput(out, "-    SECRET_KEY    =    ''")
    self.assertOutput(out, "+    SECRET_KEY    =    'django_tests_secret_key'")
    self.assertNotInOutput(out, '        APPEND_SLASH    =    True')
