def test_empty_content(self):
        result = self.pygments.render(self.context, 'text/x-python', '')
        self.assertIsNone(result)
Returns list of keys.
dataset/ETHPy150Open edgewall/trac/trac/mimeview/tests/pygments.py/PygmentsRendererTestCase.test_empty_content--crossover with--dataset/ETHPy150Open ejeschke/ginga/ginga/misc/Bunch.py/threadSafeBunch.keys