call site 0 for code.ExceptionInfo.__str__
test/testing/test_session.py - line 281
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   def test_nested_import_error(self): 
       o = tmpdir.ensure('Ians_importfailure', dir=1) 
       tfile = o.join('test_import_fail.py')
       tfile.write(py.code.Source("""
               import import_fails
               def test_this():
                   assert import_fails.a == 1
           """))
       o.join('import_fails.py').write(py.code.Source("""
               import does_not_work 
               a = 1
           """))
       session = self.mainsession(o) 
       l = session.getitemoutcomepairs(Failed)
       assert len(l) == 1 
       item, outcome = l[0]
->     assert str(outcome.excinfo).find('does_not_work') != -1