Method test_prepare_after_pass_out

Lib/test/test_graphlib.py:145–150

(self)

        ts.prepare()

    def test_prepare_after_pass_out(self):
        ts = graphlib.TopologicalSorter({'a': 'bc'})
        ts.prepare()
        self.assertEqual(set(ts.get_ready()), {'b', 'c'})
        with self.assertRaisesRegex(ValueError, r"cannot prepare\(\) after starting sort"):
            ts.prepare()

    def test_prepare_cycleerror_each_time(self):
        ts = graphlib.TopologicalSorter({'a': 'b', 'b': 'a'})