Method test_calls_before_prepare

Lib/test/test_graphlib.py:130–138

(self)

        self._assert_cycle({1: {2}, 2: {3}, 3: {2, 4}, 4: {5}}, [3, 2])

    def test_calls_before_prepare(self):
        ts = graphlib.TopologicalSorter()

        with self.assertRaisesRegex(ValueError, r"prepare\(\) must be called first"):
            ts.get_ready()
        with self.assertRaisesRegex(ValueError, r"prepare\(\) must be called first"):
            ts.done(3)
        with self.assertRaisesRegex(ValueError, r"prepare\(\) must be called first"):
            ts.is_active()

    def test_prepare_multiple_times(self):
        ts = graphlib.TopologicalSorter()