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bpo-29587: Add another test for the gen.throw() exception chain fix #19859

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Merged
cjerdonek merged 1 commit into from
May 17, 2020
Merged

bpo-29587: Add another test for the gen.throw() exception chain fix #19859

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22 changes: 22 additions & 0 deletions Lib/test/test_generators.py
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Original file line number Diff line number Diff line change
Expand Up @@ -332,6 +332,28 @@ def f():
context = cm.exception.__context__
self.assertEqual((type(context), context.args), (KeyError, ('a',)))

def test_exception_context_with_yield_inside_generator(self):
# Check that the context is also available from inside the generator
# with yield, as opposed to outside.
def f():
try:
raise KeyError('a')
except Exception:
try:
yield
except Exception as exc:
self.assertEqual(type(exc), ValueError)
context = exc.__context__
self.assertEqual((type(context), context.args),
(KeyError, ('a',)))
yield 'b'

gen = f()
gen.send(None)
actual = gen.throw(ValueError)
# This ensures that the assertions inside were executed.
self.assertEqual(actual, 'b')

def test_exception_context_with_yield_from(self):
def f():
yield
Expand Down