'test get_css'

def test_get_css(self):

    css = self.descriptor.get_css()
    test_files_dir = os.path.dirname(__file__).replace('xmodule/tests', 'test_files')
    test_css_file = os.path.join(test_files_dir, 'test_tabseditingdescriptor.scss')
    with open(test_css_file) as new_css:
        added_css = new_css.read()
    self.assertEqual(css['scss'].pop(), added_css)
    self.assertEqual(css['css'].pop(), added_css)
