def test_tracebacks(self):
@patch.object(Foo, 'f', object())
def test():
raise AssertionError
try:
test()
except:
err = sys.exc_info()
result = unittest.TextTestResult(None, None, 0)
traceback = result._exc_info_to_string(err, self)
self.assertIn('raise AssertionError', traceback)
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