from __future__ import generator_stop
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import unittest
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class TestPEP479(unittest.TestCase):
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def test_stopiteration_wrapping(self):
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def f():
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raise StopIteration
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def g():
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yield f()
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with self.assertRaisesRegex(RuntimeError,
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"generator raised StopIteration"):
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next(g())
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def test_stopiteration_wrapping_context(self):
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def f():
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raise StopIteration
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def g():
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yield f()
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try:
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next(g())
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except RuntimeError as exc:
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self.assertIs(type(exc.__cause__), StopIteration)
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self.assertIs(type(exc.__context__), StopIteration)
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self.assertTrue(exc.__suppress_context__)
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else:
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self.fail('__cause__, __context__, or __suppress_context__ '
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'were not properly set')
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if __name__ == '__main__':
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unittest.main()
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