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import unittest
from unittest import mock
from test.support import captured_stderr
import idlelib.run as idlerun
class RunTest(unittest.TestCase):
def test_print_exception_unhashable(self):
class UnhashableException(Exception):
def __eq__(self, other):
return True
ex1 = UnhashableException('ex1')
ex2 = UnhashableException('ex2')
try:
raise ex2 from ex1
except UnhashableException:
try:
raise ex1
except UnhashableException:
with captured_stderr() as output:
with mock.patch.object(idlerun,
'cleanup_traceback') as ct:
ct.side_effect = lambda t, e: t
idlerun.print_exception()
tb = output.getvalue().strip().splitlines()
self.assertEqual(11, len(tb))
self.assertIn('UnhashableException: ex2', tb[3])
self.assertIn('UnhashableException: ex1', tb[10])
if __name__ == '__main__':
unittest.main(verbosity=2)
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