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Directory : /proc/thread-self/root/opt/cppython/lib/python3.8/test/

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Current File : //proc/thread-self/root/opt/cppython/lib/python3.8/test/test_generator_stop.py

from __future__ import generator_stop

import unittest


class TestPEP479(unittest.TestCase):
    def test_stopiteration_wrapping(self):
        def f():
            raise StopIteration
        def g():
            yield f()
        with self.assertRaisesRegex(RuntimeError,
                                    "generator raised StopIteration"):
            next(g())

    def test_stopiteration_wrapping_context(self):
        def f():
            raise StopIteration
        def g():
            yield f()

        try:
            next(g())
        except RuntimeError as exc:
            self.assertIs(type(exc.__cause__), StopIteration)
            self.assertIs(type(exc.__context__), StopIteration)
            self.assertTrue(exc.__suppress_context__)
        else:
            self.fail('__cause__, __context__, or __suppress_context__ '
                      'were not properly set')


if __name__ == '__main__':
    unittest.main()