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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()